U.S. patent application number 15/700290 was filed with the patent office on 2017-12-28 for role based router functionality.
The applicant listed for this patent is CABLE TELEVISION LABORATORIES, INC.. Invention is credited to Christopher J. Donley, Christopher Grundemann.
Application Number | 20170374021 15/700290 |
Document ID | / |
Family ID | 50476464 |
Filed Date | 2017-12-28 |
United States Patent
Application |
20170374021 |
Kind Code |
A1 |
Donley; Christopher J. ; et
al. |
December 28, 2017 |
ROLE BASED ROUTER FUNCTIONALITY
Abstract
Configuration of fireball functionality for rooters operating
within a multi-router network is contemplated. The firewall
functionality configured for one or more of the routers may be
based router positioning within the multi-router network. The
firewall functionality may be automatically selected according to
the router positioning in order to facilitate dynamic and/or
adaptive router configuring.
Inventors: |
Donley; Christopher J.;
(Broomfield, CO) ; Grundemann; Christopher;
(Denver, CO) |
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Applicant: |
Name |
City |
State |
Country |
Type |
CABLE TELEVISION LABORATORIES, INC. |
Louisville |
CO |
US |
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|
Family ID: |
50476464 |
Appl. No.: |
15/700290 |
Filed: |
September 11, 2017 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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13792016 |
Mar 9, 2013 |
9774565 |
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15700290 |
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61771807 |
Mar 2, 2013 |
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61712318 |
Oct 11, 2012 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04L 61/2015 20130101;
H04L 63/02 20130101; H04L 41/08 20130101 |
International
Class: |
H04L 29/12 20060101
H04L029/12; H04L 29/06 20060101 H04L029/06; H04L 12/24 20060101
H04L012/24 |
Claims
1. A method for automatically configuring firewall functionality
within a multi-router network, the multi-router network including a
plurality of routers arranged in a logical hierarchy, the method
comprising: automatically determining a first position within the
logical hierarchy for a first router of the plurality of routers,
the first position being one of a plurality of positions defined
within the multi-router network according to connections between
the plurality of routers; and automatically configuring firewall
functionality for the first router as a function of the first
position.
2. The method claim 1 further comprising determining the first
position to be one of an edge position and an internal position,
the edge position and the internal position being defined within
the plurality of positions, the edge position defining the first
router as an edge router (ER) within the multi-router network and
the internal position defining the first router as an internal
router (IR) within the multi-router network.
3. The method of claim 2 further comprising determining the first
position automatically from addressing related information
communicated to the first router over the multi-router network.
4. The method claim 2 further comprising configuring the firewall
functionality for the first router according to an edge security
profile if the first router is determined to be in the edge
position and according to an internal security profile if the first
router is determined to be in the internal position.
5. The method of claim 4 further comprising: determining the first
router to have moved from the first position to a second position,
the first position being associated with the edge position and the
second position being associated with the internal position;
re-configuring firewall functionality for the first router from the
edge security profile to the internal security profile after
determining the first router to have moved from the first position
to the second position.
6. The method claim 4 further comprising: configuring the firewall
functionality for the first router according to the edge security
profile by configuring the first router to implement one of more
edge security rules, the edge security rules being specified within
the edge security profile; and configuring the firewall
functionality for the first router according to the internal
security profile by configuring the first router to implement one
of more internal security rules, the internal security rules being
specified within the internal security profile.
7. The method of claim 6 further comprising defining one or more of
the edge security rules to include: a first edge rule for denying
most incoming traffic on an up interface except for DHCP, Neighbor
Discovery, ICMP, or pre-established TCP, UDP, and/or multicast
streams; a second edge rule for blocking outgoing Port Control
Protocol (PCP) and UPnP IGD messages on the up interface, except
for a default list for peer-to-peer, SIP/VoIP, gaming, and/or http;
a third edge rules for blocking site-scoped multicast messages from
being sent to the up interface, while IRs forward site-scoped
multicast messages passing a Reverse Path Forwarding check out all
interfaces.
8. The method of claim 6 further comprising defining one or more of
the internal security rules to include: a first internal rule for
enabling the first router to act as a UPnP/PCP gateway; a second
internal rule for enabling simple security; a third internal rule
for providing intrusion detection and/or intrusion protection; and
a fourth internal rule for filtering PCP messages from the
multi-router network to a special security zone network.
9. The method of claim 6 further comprising defining at least one
of: defining a majority of the edge security rules to be different
from the internal security rules; and defining all of the edge
security rules to be different from the internal security
rules.
10. The method of claim 2 further comprising configuring firewall
functionality for the first router according to edge instructions
associated with the edge security profile and internal instructions
associated with the internal security profile, both of the edge
instructions and the internal instructions being stored within a
memory of the first router.
11. The method of claim 2 further comprising configuring the
firewall functionality for the first router by one of enabling and
disabling a stateful firewall of the first router, including
enabling the stateful firewall if the first router is determined to
be in the edge position and disabling the stateful firewall if the
router is determined to be in the internal position.
12. The method of claim 2 further comprising configuring the
firewall functionality for the first router by one of enabling and
disabling a network address translator (NAT) of the first router,
including enabling the NAT if the first router is determined to be
in the edge position and disabling the NAT if the router is
determined to be in the internal position.
13. The method of claim 2 further comprising: automatically
determining a second position within the logical hierarchy for a
second router of the plurality of routers, the second position
being one of a plurality of positions defined within the
multi-router network according to connections between the plurality
of routers; determining the second position to be one of the edge
position and the internal position; automatically configuring
firewall functionality for the second router as a function of the
second position, including configuring the firewall functionality
for the second router according to the edge security profile if the
second router is determined to be in the edge position and
according to the internal security profile if the second router is
determined to be in the internal position.
14. The method of claim 13 further comprising: preventing
configuring firewall functionality for the first router and the
second router in the event both of the first router and the second
router are determined to be in the edge position; permitting
configuring firewall functionality for the first router and the
second router in the event both of the first router and the second
router are determined to be in the internal position; and
permitting configuring firewall functionality for the first router
and the second router in the event one of the first router and the
second router is determined to be in the edge position and the
other one of the first router and the second router is determined
to be in the internal position.
15. A computer program product embedded in a non-transitory
computer readable medium, the medium storing instructions
sufficient for use with a processor to facilitate configuring
firewall functionality for routers, the medium including
instructions sufficient for: determining router positioning within
a logical hierarchy of a multi-router network comprised of
plurality of routers, the router positioning being determined to be
one of an edge position and an internal position; and configuring
use of firewall functionality according to an edge security profile
when router positioning is determined to be the edge position and
according to an internal security profile when router positioning
is determined to be the internal position.
16. The computer program product of claim 15 wherein the medium
includes instructions sufficient for enabling stateful firewall
functionality if the router positioning corresponds with the edge
position and for disabling stateful firewall functionality if the
router positioning corresponds with the internal position.
17. The computer program product of claim 15 wherein the medium
includes instructions sufficient for selecting at least one of a
plurality of firewall functionality options defined within the
internal security profile, the internal security profile including
at least the following firewall functionality options: disabling
filtering; implementing simple security and PCP; and implementing
advanced security.
18. The computer program product of claim 15 wherein the medium
includes instructions sufficient for determining router positioning
as a function of messaging routed over the multi-router network
without use of routing tables associated with a routing
protocol.
19. A router comprising: a plurality of interfaces configured for
routing data packets, including at least one up interface and at
least one down interface; a position detection module configured to
detect a position of the router within a multi-router network; a
profile selection module configured to selection a functionality
profile from a plurality of functionality profiles based on the
position determined with the position detection module; and a
functionality controller configured to control packet passage
between the interfaces according to the functionality profile
selected with the profile selection module.
20. The router of claim 19 wherein: the position detection module
is configured for determining the position to be one of an edge
position and an internal position, the edge position defining the
first router as an edge router (ER) within the multi-router network
and the internal position defining the first router as an internal
router (IR) within the multi-router network; and the profile
selection module includes an edge profile and an internal profile,
the edge profile for use with the functionality controller if the
position is determined to be in the edge position and the internal
security profile for use with the functionality controller if the
position is determined to be in the internal position.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. application Ser.
No. 13/792,016, filed Mar. 9, 2013, which application claims the
benefit of U.S. provisional Application No. 61/712,318 filed Oct.
11, 2012, and U.S. provisional Application No. 61/771,807 filed
Mar. 2, 2013, the disclosures of which are incorporated in their
entirety by reference herein.
TECHNICAL FIELD
[0002] The present relates to configuring functionality for routers
included within a multi-router network, such as but not necessary
limited to facilitating will role based firewall where firewall
functionality is dynamically varied according to router positioning
within the multi-router network.
BACKGROUND
[0003] A multi-router network may be characterized as a network
having a plurality of routers connected together and arranged in a
logical hierarchy. With the launch of new services, such as but not
limited to home security, IP video, Smart Grid, etc., and more
consumer devices, such as but not limited to televisions, mobile
phones, appliances, etc., being configured with routers,
multi-router networks are becoming more prevalent. Multi-router
networks require multiple routers to communicate with each other
over network links, the establishment of messaging protocols,
hierarchical relationships, address assignments, prefix
delegations, security measures, backup capabilities and a potential
number of additional functional capabilities in order to properly
and securely govern network communications. As the prevalence of
such multi-router networks continues to grow, one non-limiting
aspect of the present invention contemplates a need to facilitate
configuring routers to operate in such a complex environment.
[0004] Without intending to limit the scope of the present
invention, and while not dispositive of environments where a need
may exist to facilitate configuring routers, one non-limiting
aspect of the present invention foresees a particular need in
facilitating configuration of routers employed in small office and
home office (SoHo) environments. SoHo and similar environments may
employ routers having off-the-shelf, default, pre-configured and/or
consumer-level configurations where the corresponding routers may
be commonly referred to as home Internet Protocol (IP) network
(HIPnet) routers. Such pre-configurations may thwart inter-router
communications and other operations associated with facilitating
use and/or construction of a multiple-router network. Default
firewall and/or network address translator (NAT) setting of such
HIPnet routers may particularly disrupt inter-router
communications, particularly communications from one subnet to
another. Accordingly, one non-limiting aspect of the present
invention contemplates facilitating configuration of HIPnet or
other types of pre-configured routers for use in multi-router
networks.
BRIEF DESCRIPTION OF THE DRAWINGS
[0005] FIG. 1 illustrates a role based router system in accordance
with one non-limiting aspect of the present invention.
[0006] FIG. 2 illustrates a router having role based features in
accordance with one non-limiting aspect of the present
invention.
[0007] FIG. 3 illustrates a flowchart for a method of facilitating
role based router functionality in accordance with one non-limiting
aspect of the present invention.
DETAILED DESCRIPTION
[0008] As required, detailed embodiments of the present invention
are disclosed herein; however, it is to be understood that the
disclosed embodiments are merely exemplary of the invention that
may be embodied in various and alternative forms. The figures are
not necessarily to scale; some features may be exaggerated or
minimized to show details of particular components. Therefore,
specific structural and functional details disclosed herein are not
to be interpreted as limiting, but merely as a representative basis
for teaching one skilled in the art to variously employ the present
invention.
[0009] FIG. 1 illustrates a role based router system 10 in
accordance with one non-limiting aspect of the present invention.
The system 10 illustrates one exemplary configuration where a
delegating router 12 associated with an outside network 14 provides
a prefix 16 (first prefix) to a requesting router 18 for delegation
within an inside network 20. The prefix 16 may be any suitable
addressing prefix, such as but not necessarily limited to an
Internet Protocol version 6 (IPv6) prefix and an Internet Protocol
version 4 (IPv4) prefix. The present invention is predominantly
described with respect to use of IPv6 without necessarily intending
to limit the scope of the present invention. Dynamic Host
Configuration Protocol (DHCP), such as that described in Internet
Engineering Task Force (IETF) request for comment (RFC) 2131, 3315
and 3633, the disclosures of which are hereby incorporated by
reference in their entireties, or other suitable delegation
processes may be employed to facilitate delegating the first prefix
to the requesting router 18. The requesting router 18 may be
configured to facilitate adaptively delegating the first prefix 16
to additional routers associated with the inside network 20, such
as in the manner described in U.S. patent application Ser. No.
13/783,242, the disclosure of which is hereby incorporated by
reference in its entirety.
[0010] The outside network 14 and the inside network 20 demonstrate
one exemplary, non-limiting use of the present invention where a
multiple system operator (MSO), Internet service provider (ISP) or
other type of service provider is allocated a prefix or addressing
domain by a suitable addressing entity to facilitate Internet-based
messaging or other network-based messaging. The inside network 20
is shown to be distinguished from the outside network 14 to
demonstrated one use case where an MSO may be tasked with
facilitating messaging for a plurality of inside networks, such as
but not necessarily limited to home networks or other internal
networks associated with its subscribers. While only one inside
network 20 is illustrated, the MSO may be responsible for
facilitating prefix delegation with any number of inside networks
or other downstream connected networks. The requesting router 18,
which may be periodically referred to herein as a customer edge
router (CER) or edge router (ER) where routers connected downstream
may be periodically referred to herein as internal routers (IRs).
Optionally, the ER, IRs and/or devices may be configured to receive
multiple prefixes, such as in the manner described in U.S. patent
application Ser. No. 13/754,954, the disclosure of which is hereby
incorporated by reference in its entirety.
[0011] A five layer architecture is shown to correspond with a
first layer having the ER, a second layer having one or more IRs
connected directly to the ER, a third layer having one or more IRs
and/or devices connected to one of the second layer IRs, a fourth
layer having one or more IRs and/or devices connected to one of the
third layer IRs, and a fourth layer having one or more devices
connected to one of the fourth layer IRs. The IRs and/or devices
are shown to be connected to a single upstream ER or IRs as such
devices may be configured to listen to no more than one delegating
router/device on a link (solid lines) in order to comply with DHCP
requirements. The single-connection of each component is shown for
exemplary non-limiting purposes as the present invention fully
contemplates the inside network having any number of configurations
and interconnections between the ER, IRs and/or devices. The
interconnections between the ER, IRs and devices are shown to
correspond with wireline connections but may be similarly
interconnected using wireless, radio frequency (RF), Bluetooth or
other wireless types of links. One non-limiting aspect of the
present invention contemplates the ER and/or the IRs being HIPnet
routers or other consumer-level routers having off-the-shelf,
default, pre-configured and/or consumer-level configurations.
[0012] In the event HIPnet routers, or other similarly
pre-configured routers, interconnect to form the inside network,
the inside network may be considered as a multi-router network or a
SoHo network. One non-limiting aspect of the present invention
contemplates a need to facilitate configuring capabilities and/or
functionality of such routers to support inter-router
communications within the multi-router network, including when such
routers are deployed by network novices or other individuals
lacking ability or desire to program, adjust or otherwise
manipulating router functionality to communicate with each other
over network links and/or to establish messaging protocols,
hierarchical relationships, address assignments, prefix
delegations, security measures, backup capabilities and a potential
number of additional functional capabilities desired to properly
and securely govern network communications. One non-limiting aspect
of the present invention contemplates a role based router feature,
such as but not necessary limited to a computer program product,
having capabilities to automatically, adaptively and/or dynamically
facilitate selection of desirable router functionality. The
computer program product may be embedded in a non-transitory
computer readable medium storing instructions, which when operable
with a processor or other logically executing device, are
sufficient for configuring router functionality.
[0013] FIG. 2 illustrates an exemplary router 32 deployed within
the system 10 having role based features 32 in accordance with one
non-limiting aspect of the present invention. The role based
features 32 are shown to correspond with a functionality module 34,
a position detection module 36 and a security profile selection
module 38, although other configurations and/or modules may be
included without deviating from the scope and contemplation of the
present invention. The modules 34, 36, 38 may be associated with a
processor (not shown) to facilitate executing operations according
to instructions stored in a computer-readable medium (not shown) or
the modules 34, 36, 38 may be otherwise associated with the router
30 to facilitate the contemplated operations. Optionally, the
modules 34, 36, 38 may be part of or embodied in a computer program
product installable on the router 30 prior to deployment,
downloaded thereto as part of the DHCP provisioning or other
provisioning associated within initially providing internet access
or access to other provider services, and/or included within a
controller operable within the multi-router network 20 to
facilitate router provisioning and functionality limitation. The
modules 34, 36, 38 and/or other logically executing features
contemplated by the present invention may be used facilitate
automatically configuring functionality of the routers 30 deployed
in the multi-router network 20 to automatically, adaptively and/or
dynamically facilitate selection of desirable router
functionality.
[0014] The router 30 shown to include one or more of up interfaces
40 and one or more down interfaces 42. The router 30 may be a
directionless router having a plurality of receptacles configured
to facilitate connection to cables or other wired communication
mediums used to communicate signals between other routers 30 within
the multi-router network and/or wireless interfaces to perform some
operations. The interfaces 34, 36, 38 may be adaptively assigned to
an up direction and a down direction depending on positioning of
the corresponding router within the multi-router network 20. The
router 30 may include a directional processing feature (not shown),
such as but not necessary limited to that described in U.S. patent
application Ser. No. 13/792,023, entitled Interface Directionality
Assignment, filed Mar. 9, 2013, the disclosure of which is hereby
incorporated by reference in its entirety, to facilitate assigning
up/down directionality to each of the interfaces 34, 36, 38. While
not intending to limit the scope and contemplation of the present
invention and/or the positioning or hierarchical relevance of the
corresponding router, the up interface(s) 40 may be associated with
or characterize as a wide area network (WAN) interface and the down
interface(s) 42 may be associated with or characterize as a local
area network (LAN) interface. The router 30 may be configured to
route messages, signaling and other information between the up
interface(s) 40 and the down interface(s) 42, with signaling
traveling in a downstream direction from the up interface(s) 40 to
the down interface(s) 42 and upstream direction from the down
interface(s) 42 to the up interface(s) 40.
[0015] The signaling traveling between the up interface(s) 40 and
the down interface(s) 42 may be processed according to
functionality associated with the router 30. For exemplary
non-limiting purposes, the functionality is illustrated with
respect to a firewall. The firewall may be part of a functionality
controller 34 configured to process, control and otherwise
manipulate data packets (messages, signaling, etc.) passed between
the interfaces. The firewall may be configured to block, transmit,
process or otherwise manipulate signaling between the up
interface(s) 40 in the down interface(s) 42 according to various
settings and configurations. The firewall demonstrates one use of
the present invention to facilitate automatically configuring
firewall functionality according to various parameters associated
with the multi-router network 20. Optionally, the firewall
functionality may be selected according to a logical positioning of
the corresponding router 30 within the multi-router network 20 in
order to ensure desired inter-router communications and network
security. While the firewall is illustrated, the present invention
is not necessary limited to configuring firewall functionality and
fully contemplates configuring other router functionality,
including that described below in more detail. Configuring firewall
functionality is believed to be particularly beneficial at least in
that HIPnet routers or other pre-configured routers may include
default or pre-set firewall functionality that can prevent
desirable inter-router communications if not properly adjusted upon
router deployment within the multi-router network.
[0016] The firewall may be considered as a stateful firewall, such
as that described in RFC 6092, the disclosure of which is hereby
incorporated by reference in its entirety. The stateful firewall
may facilitate stateful packet inspection (SPI) to selectively
inspect and permit or deny transmission therethrough of packets or
other information data types depending on state of network
connections, content, addresses and/or other information
illustrative of the corresponding source/destination or otherwise
reflective of the data transmission. The inspected information may
be compared against a permitted set of information, database,
signatures or other filtering related parameters to assess whether
passage should be granted. The firewall may be deployed in a
"default" state where packets other than those associated with an
outgoing communication, i.e., a communication initiated from the
router to an upstream device and/or router are blocked. The
blocking of non-outgoing or upstream originating signaling may
effectively prevent communications between routers (ER, IRs) and/or
devices connected within the SoHo network (multi-router network)
20, including those connected to different subnets or links. This
inability to support inter-router communications "out of the box"
can be particularly problematic to consumers attempting to use
routers, devices having routers and/or devices within a
multi-router network.
[0017] The firewall may be operable between an enabled state where
stateful protection blocks all but upstream originating signaling
and a disabled state where all signaling, including upstream
originating signaling, is permitted, such as by turning "off" the
firewall protection. One non-limiting aspect of the present
invention contemplates the position detection module 36 determining
a positioning of the router 30 within the multi-router network 20
and selectively enabling and disabling the stateful firewall
depending on the determined position. This may include the security
profiles selection module 38 having a set of rules for specifying
enablement/disablement of the firewall and/or other functionality
of the router 30 according to its determined position. The security
profile selection module 38 may include an edge security profile,
an internal security profile or other position based profiles. The
profiles may define a corresponding set of instructions, commands
or other controls sufficient to achieve the desired functionality
settings. Optionally, the instructions, etc., associated with the
security profiles may be stored on the router 30 as a part of the
computer program product, application, software or other control
mechanism of the router 30. The present invention is predominantly
described with respect to the security profiles defining edge
instructions and internal instructions for dictating functionality
depending on whether the router 30 is characterized as an ER or an
IR without intending to limit the scope and contemplation of the
present invention as other positional characterizations are
contemplated.
[0018] The positioning detection module 36 may be configured to
determine positioning of the router or its role within the
multi-router network, i.e., whether the router is an ER or an IR,
as a function of messaging and/or addressing associated with
assigning the router an address and/or a prefix. The role may be
determined by performing a "48 check", a DHCPv6 CER-ID option
and/or another type positional determination, such as but not
limited to a physical determination. The "48 check" may correspond
with the position detection module 36 comparing the first 48 bits
of the assigned IA_NA to the first 48 bits of the assigned IA_PD
such that the router is determined to be an IR if the first 48 bits
of each match and an ER if the first 48 bits fail to match. For
example, if IA_NA/SLAAC is in a different /48 from the IA_PD, the
router may be determined to be an ER, and if IA_NA/SLAAC is in the
same /48 as its IA_PD, the router may be determined to be and
IR.
[0019] The DHCPv6 CER-ID option may correspond with the position
detection module 36e utilizing a DHCPv6 option to identify whether
the router is an ER, and if not then determining the router to be
an IR. The DHCPv6 option may operate on the assumption that an ER
sets a CER_ID (DHCPv6 option) to the IPv6 address of its LAN
interface. If it has more than one LAN IPv6 address, it selects one
of its LAN or loopback IPv6 addresses to be used in the CER_ID. An
ISP server does not respond with the CER_ID or sets the CER_ID to
::, whereby receipt of such a response indicates to the router is
an ER and the failure to receive such a response indicates the
router is an IR. In more detail, a DHCPv6 client may be configured
to include the CER Identification option code in an Option Request
option in its DHCP Solicit messages. The DHCPv6 server (delegating
router) may include the CER Identification option in any response
it sends to a client (requesting router) that has included the CER
Identification option code in an Option Request option. The CER
Identification option may be sent in the main body of the message
to client, not as a sub-option in, e.g., an IA_NA, IA_TA option.
When sending the CER Identification option, the DHCPv6 server
(delegating router) may set the CER_ID value to either one of its
IPv6 addresses or ::. If a device (router) does not receive the CER
Identification Option or receives a CER_ID of :: from the DHCPv6
server, it may include one of its Globally Unique IPv6 address(es)
in the CER_ID value in response to DHCPv6 messages received by its
DHCPv6 server that contains the CER Identification option code in
an Option Request option. If the device has only one LAN interface,
it may use its LAN IPv6 address as the CER_ID value. If the device
has more than one LAN interface, it may use the lowest Globally
Unique address not assigned to its WAN interface.
[0020] The physical determination may be based on some routers 30
having a physical differentiator built into them by design that
will indicate that they are a ER. Examples include mobile routers,
DSL routers, and cable eRouters. In the case of a mobile router,
the presence of an active cellular connection indicates that the
router 30 is at the customer edge Likewise, for an eRouter, the
presence of an active DOCSIS link tells the router that it is at
the customer edge. HIPnet routers and others may use more than one
of the above techniques in combination to determine the edge. For
example, an internal router may check for the CER_ID option, but
may also use the 48 check in case its upstream router does not
support CER_ID.
[0021] In addition to the foregoing positional determination
mechanisms, the present invention fully contemplates the use of
other processes and/or features for routers 30 to determine the
relative positioning within the logical hierarchy of a multi-router
network 20. While contemplated, the positioning or hierarchical
relevance of each router 30 may be determined without use of a
routing protocol, such as Routing Information Protocol (RIP) and
the Open-Shortest-Path-First protocol (OSPF), the disclosures of
which are hereby incorporated by reference. The routing protocol
may correspond with routing tables and other information provided
to the router 30 to facilitate determining the relative position
within the multi-router network. The routing tables may define
routes between each one or more of the routers (ER, IRs) and/or
known to the routers such that the receiving router 30 is then
responsible for comparing the tables to determine its relative
positioning. The capability of the present invention to facilitate
positional determinations without use of such routing protocols may
be advantageous with routers 30 that may not be configured with
capabilities to process such routing tables, within environments
where it may be difficult or impossible to provide desired routing
tables to the routers 30 and/or to facilitate implementation of the
contemplated role based router functionality selection without
having to update or comply with routing protocol requirements.
[0022] While the foregoing utilizes positional determinations to
facilitate selectively enabling and disabling firewall
functionality, the present invention fully contemplates using
positional determinations to facilitate implementing additional
functionality in addition to or in place of the firewall
functionality according to other rules or instructions set forth in
a corresponding one of the security profiles. The router 30, for
example, may be configured with a default or pre-set network
address translator (NAT) parameter, particularly if the router is
and IPv4 router or a dual stack router, i.e., a router having IPv4
and IPv6 capability, whereby the default setting of the NAT
parameter may thwart desired inter-router communications. The NAT
parameters, similarly to the firewall parameter, may be set
according to security profile roles depending on whether the
corresponding router is and ER or and IR, e.g., the NAT may be
disabled when the router 30 is an IR and enable when the router is
an ER. Additional role based policies may include:
[0023] An ER rule denying incoming traffic on its WAN interface 40
(except DHCP, Neighbor Discovery, ICMP, or pre-established TCP,
UDP, or multicast streams, which may be subscriber selectable);
[0024] An ER rule blocking outgoing Port Control Protocol (PCP) and
UPnP IGD messages on its WAN interface 40, except for a default
list (e.g. peer-to-peer, SIP/VoIP, gaming, and http), which may be
subscriber selectable;
[0025] An ER rule blocking site-scoped multicast messages from
being sent to the WAN 40, while IRs forward site-scoped multicast
messages out all interfaces 40, 42 (optionally, provided they pass
a Reverse Path Forwarding check);
[0026] An IR rule enabling full support for PCP MAP messages. That
is, the IR serves as a PCP server for all MAP messages, not just a
limited subset;
[0027] An IR rule enabling operation as a UPnP/PCP gateway;
[0028] An IR rule enabling "Simple Security", such as that
described in RFC 6092;
[0029] An IR rule enabling "Advanced Security", such as that
described in I-D.vyncke-advanced-ipv6-security, the disclosure of
which is hereby incorporated by reference in its entirety, which
may optional provide Intrusion Detection/Intrusion Protection;
and/or
[0030] A special IR connecting rule enabling a "medium trust"
network (e.g. SmartGrid) to filter PCP messages from the inside
network to the special security zone network. The special security
zone can be identified by ULA address space not used in the
internal network.
[0031] Within the illustrated multi-router network 20, it may
desirable for the routers 30 to be equipped with stateful firewall
capabilities. Such routers may provide "on by default" security
where incoming traffic is limited to return traffic resulting from
outgoing packets. It may also be desirable to allow users to create
inbound `pinholes` for specific purposes, such as online gaming,
manually similar to those described in Simple Security. "Advanced
Security" features optionally may be used to support the concept of
end-to-end IPv6 reachability and could be added to provide
intrusion detection (IDS/IPS) support. Local Network Protection for
IPv6 (RFC4864), the disclosure of which is hereby incorporated by
reference in its entirety, may be used to facilitate firewall
functions that replace NAT security and calls for simple security.
The present invention recommends that the ER enable a firewall by
default and that IRs have at least one of the three options
described below:
[0032] IR Firewall Option 1--Filtering Disabled: Once a home router
determines that it is not the CER, it disables its firewall and
allows all traffic to pass. The advantages of this approach is
simple and easy to troubleshoot and it facilitates whole-home
service discovery and media sharing. The disadvantages are that it
does not protect home devices from each other (e.g. infected
machines could affect entire home network).
[0033] IR Firewall Option 2--Simple Security+PCP: Home routers may
have a stateful firewall on by default, regardless of CER/IR status
but IRs allow "pin-holing" using PCP I-D.ietf-pcp-base, the
disclosure of which is hereby incorporated by reference in its
entirety. CERs can restrict opening PCP pinholes on the up
interface. The advantages of this approach may be that it protects
the home network from internal threats in other LAN segments and it
mirrors legacy IPv4 router behavior. The disadvantages to this
approach may be that it is less predictable; it relies on
application "pin-holing", a "default deny" rule that may interfere
with service discovery and/or content sharing, and requires PCP
clients (e.g. on PCs and CPE devices).
[0034] IR Firewall Option 3--Advanced Security: Once a home router
determines that it is not the CER, it may disable its stateful
firewall and activate a firewall (IPS). The advantages to this
approach may be that it protects the home network from internal
threats in other segments and is more predictable than Option 2,
since internal traffic is allowed by default. The disadvantages may
be that adaptive filtering is more complex than static filtering
and may require a "fingerprint" subscription to work well.
[0035] Of course, while the foregoing describes recommended router
behavior, device manufacturers and/or software providers may
leverage the capabilities of the present invention to facilitate
role based router functionality implementation, optionally
according to positional determinations, to specify additional
security profiles and to make router security options user
configurable.
[0036] FIG. 3 illustrates a flowchart 50 for a method of
facilitating role based router functionality in accordance with one
non-limiting aspect of the present invention. The method may be
used to facilitate automatically configuring routers deployed
within a multi-router network or other logical hierarchy defined by
physical and/or wireless connectivity according to the roles played
by each router. The method is predominantly described with respect
to the router roles being based on relative router positioning,
which for exemplary non-limiting purposes is assumed to correspond
with one of an internal position and an edge position. The internal
position is characterized as the corresponding router being an IR
having a wireline or wireless upstream connection either directly
to an ER or another IR. The edge position is characterized as the
corresponding router being an ER having a wireline or wireless
upstream connection to a router outside of the multi-router
network, such as that associated with an ISP, MSO or other service
provider (e.g. a cable, satellite or broadcast television service
provider; a cellular phone service provider, a voice over Internet
protocol (VoIP) service provider; a content streaming/downloading
source; etc.).
[0037] Blocks 52, 54 relates to determining router positioning. The
routers may individually determine router positioning upon being
connected within the multi-router network. The router positioning,
for example, may be determined as a function of addressing or other
messaging information provided to the connecting router upon
establishing a connection within the multi-router network.
Optionally, the routers may be instructed as to the relative
positioning by a controller, network administrator or other
features associated with the multi-router network. One non-limiting
aspect the present invention contemplates the routers individually
determining router positioning by comparing addressing bits, such
as that associated with an IA_NA and IA_PD provided thereto and/or
as a function of a CER_ID option. The router positioning
determination may not necessarily be dispositive of the routers
position relative to other similarly characterize routers, i.e.,
the router positioning inquiry may simply confirm whether the
router is an ER or an IR. Once the router determines itself to be
an IR, and while contemplated to do so, additional determinations
regarding the router' s positioning relative to other IRs need not
be performed, which can be beneficial in ameliorating processing
demands on the router.
[0038] Block 56 relates to configuring IR role based router
functionality for the router after the router positioning
determines the router to be an IR. The IR role based router
functionality may be implemented according to an internal security
profile stored on the router and/or provided thereto. The internal
security profile may include roles, instructions, commands and/or
other information associated with facilitating automatic
configuration of the router according to desired role based
functionality. The internal security profiles may specify a
plurality of internal instructions sufficient for automatically
controlling the router to implement the desired functionality, such
as to facilitate setting firewall, NAT and/or other capabilities of
the router without requiring corresponding user interaction or
programming of the router. Optionally, the configuring the IR role
based functionality may include directing implementation of
multiple functional capabilities according to a plurality of
internal rules and/or profiles associated with the IR positioning
determinations, which be beneficial to facilitate implementing
non-security and/or non-networking parameters for the router.
[0039] Block 58 relates to determining a positional change in the
IR. The positional change may corresponding with a role of the
router changing with the home network, such as in the event the
router changes from an IR to an ER and/or if the router changes IR
positions from one portion or subnet to another portion of subnet
of the multi-router network. While the particular IR router
positioning or subnet need not necessarily be determined, in the
event certain internal router profiles are provided for certain
portions or subnets (e.g. to set different security parameters for
certain portions of the network), such a determination may be
implemented in order to implement correspondingly specific role
based functionality. The router may also change from an IR
characterization to an ER characterization in the event
multi-homing occurs, the previously determined ER fails or requires
temporary use of one of the IRs for backup, a change in
hierarchical relationship is implemented and/or a connection of the
IR not available to a previously determined ER is required to
facilitate communications. In the event these or other positional
changes are determined, Block may be returned to facilitate
implementation of corresponding role based functionality.
[0040] Block 60 relates to determining the router to be in the edge
position and assessing whether additional edge positioned routers
are active within the multi-router network. The assessment of Block
60 may be an optional step to check whether the prefix delegation
processing and/or addressing assignment properly constructed the
multi-router network to include a single ER or at least a single ER
for the type of services, network, etc. being performed with the
router attempting to implement role based functionality (e.g., the
multi-router network may have virtual networks, tunnels, etc. that
allow the use of multiple ERs for the corresponding services).
Block 62 is reached in the event multiple edge positioned routers
are determined to be in conflict to facilitate generating an error
message or implementing other corrective action. In the event the
multi-router network prevents multiple routers from being
characterized as edge positioned and/or the router is unable to
make such an assessment (e.g., the router may be unable to make
such an assessment without utilizing router protocols), Block 60
may be bypassed in favor of directly proceeding to Block 64.
[0041] Block 64 relates to configuring IR role based router
functionality for the router after the router positioning
determines the router to be an ER. The ER role based router
functionality may be implemented according to an edge security
profile stored on the router and/or provided thereto. The edge
security profile may include roles, instructions, commands and/or
other information associated with facilitating automatic
configuration of the router according to desired role based
functionality. The edge security profiles may specify a plurality
of edge instructions sufficient for automatically controlling the
router to implement the desired functionality, such as to
facilitate setting firewall, NAT and/or other capabilities of the
router without requiring corresponding user interaction or
programming of the router. Optionally, the configuring the IR role
based functionality may include directing implementation of
multiple functional capabilities according to a plurality of edge
rules and/or profiles associated with the ER positioning
determinations, which be beneficial to facilitate implementing
non-security and/or non-networking parameters for the router. Block
66 relates to performing a positional change assessment for the ER
similar to the manner described in Block 58.
[0042] As supported above, one non-limiting aspect of the present
invention contemplates facilitating firewall functionality on a
home router that changes based on the role played by the router
(e.g. whether it is at the customer edge or internal to the
network). The process is contemplated by the present invention may
be beneficial in providing security throughout the home network,
while providing extra protection at the edge. This may enable
enhanced communication within the home, while also securing the
home from unwanted attack.
[0043] While exemplary embodiments are described above, it is not
intended that these embodiments describe all possible forms of the
invention. Rather, the words used in the specification are words of
description rather than limitation, and it is understood that
various changes may be made without departing from the spirit and
scope of the invention. Additionally, the features of various
implementing embodiments may be combined to form further
embodiments of the invention.
* * * * *