Network Working Group B. Sarikaya
Internet-Draft Huawei USA
Intended status: Standards Track July 10, 2012
Expires: January 11, 2013
IPv6 RA Options for Multiple Interface Next Hop Routes
draft-sarikaya-mif-6man-ra-route-01
Abstract
This draft defines new Router Advertisement options for configuring
next hop routes on the mobile or fixed nodes. Using these options,
an operator can easily configure nodes with multiple interfaces (or
otherwise multi-homed) to enable them to select the routes to a
destination. Each option is defined together with definitions of
host and router behaviors.
Status of this Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on January 11, 2013.
Copyright Notice
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described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Default Route Configuration . . . . . . . . . . . . . . . . . . 4
4. Route Prefix option . . . . . . . . . . . . . . . . . . . . . . 4
5. Next Hop Address option . . . . . . . . . . . . . . . . . . . . 5
6. Next Hop Address with Route Prefix option . . . . . . . . . . . 6
7. Security Considerations . . . . . . . . . . . . . . . . . . . . 6
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 7
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 8
10.1. Normative References . . . . . . . . . . . . . . . . . . . 8
10.2. Informative References . . . . . . . . . . . . . . . . . . 8
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 9
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1. Introduction
IPv6 Neighbor Discovery and IPv6 Stateless Address Autoconfiguration
protocols can be used to configure fixed and mobile nodes with
various parameters related to addressing and routing [RFC4861],
[RFC4862], [RFC4191]. DNS Recursive Server Addresses and Domain Name
Search Lists are additional parameters that can be configured using
router advertisements [RFC6106].
Router Advertisements can also be used to configure fixed and mobile
nodes in multi-homed scenarios with route information and next hop
address. Different scenarios exist such as the node is
simultaneously connected to multiple access network of e.g. WiFi and
3G. The node may also be connected to more than one gateway. Such
connectivity may be realized by means of dedicated physical or
logical links that may also be shared with other users nodes such as
in residential access networks.
2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
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3. Default Route Configuration
A host, usually a mobile host interested in obtaining routing
information usually send a Router Solicitation (RS) message on the
link. The router, when configured to do so, provides the route
information using zero, one or more Next Hop Address and Route
Information options in the router advertisement (RA) messages sent in
response.
The route options are extensible, as well as convey detailed
information for routes. The router sends one or more Next Hop
Address options that specify the IPv6 next hop addresses. Each Next
Hop Address option may be associated with zero, one or more Route
Prefix options that represent the IPv6 destination prefixes reachable
via the given next hop. Router includes Route Prefix option directly
in message to indicate that given prefix is available directly on-
link. Router MAY send a single Next Hop Address without any Route
Prefix options. When router sends Next Hop Address option that is
associated with Router Prefix option, the router MUST use Next Hop
and Route Prefix option defined in Section 6. The Route Prefix MAY
contain ::/0, i.e. with Prefix Length set to zero to indicate
available default route.
RS and RA exchange is for next hop address and route information
determination and not for determining the link-layer address of the
router. Subsequent Neighbor Solicitation and Neighbor Advertisement
exchange can be used to determine link-layer address of the router.
It should be noted that the proposed options in this document will
need a central site-wide configuration mechanism. The required
values can not automatically be derived from routing tables.
4. Route Prefix option
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Prefix Length |Resvd|Prf|Metric|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Route Lifetime |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Prefix (Variable Length) |
. .
. .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: Route Prefix option
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Fields:
Type: TBD.
Length: The length of the option (including the Type and Length
fields) in units of 8 octets.
Other fields are as in [RFC4191] except:
Metric Route Metric. 3-bit signed integer. The Route Metric
indicates whether to prefer the next hop associated with this prefix
over others, when multiple identical prefixes (for different next
hops) have been received.
5. Next Hop Address option
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Next Hop Address ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: Next Hop Address option
Fields:
Type: TBD.
Length: The length of the option (including the type and length
fields) in units of 8 octets. It's value is 3.
Next Hop Address: An IPv6 address that specifies IPv6 address of the
next hop. It is 16 octets in length.
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6. Next Hop Address with Route Prefix option
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Length | Next Hop Address ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... | Prefix Length |Resvd|Prf|Metric|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Route Lifetime |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Prefix (Variable Length) |
. .
. .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 3: Next Hop Address with Route Prefix option
Fields:
Type: TBD.
Length: The length of the option (including the type and length
fields) in units of 8 octets. For example, the length for a prefix
of length 16 is 5.
Other fields are as in Section 4 and Section 5.
7. Security Considerations
Neighbor Discovery is subject to attacks that cause IP packets to
flow to unexpected places. Because of this, neighbor discovery
messages MUST be secured, possibly using Secure Neighbor Discovery
(SEND) protocol [RFC3971].
8. IANA Considerations
Authors of this document request IANA to assign three new RA options:
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+-----------------------------------+------+
| Option Name | Type |
+-----------------------------------+------+
| Route Prefix | |
| Next Hop Address | |
| Next Hop Address and Route Prefix | |
+-----------------------------------+------+
Table 1:
9. Acknowledgements
Brian Carpenter provided comments that have led to improvements in
the document. We are also grateful to Zhen Cao for his comments.
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10. References
10.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2629] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629,
June 1999.
[RFC3971] Arkko, J., Kempf, J., Zill, B., and P. Nikander, "SEcure
Neighbor Discovery (SEND)", RFC 3971, March 2005.
[RFC4191] Draves, R. and D. Thaler, "Default Router Preferences and
More-Specific Routes", RFC 4191, November 2005.
[RFC4605] Fenner, B., He, H., Haberman, B., and H. Sandick,
"Internet Group Management Protocol (IGMP) / Multicast
Listener Discovery (MLD)-Based Multicast Forwarding
("IGMP/MLD Proxying")", RFC 4605, August 2006.
[RFC4861] Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
"Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,
September 2007.
[RFC4862] Thomson, S., Narten, T., and T. Jinmei, "IPv6 Stateless
Address Autoconfiguration", RFC 4862, September 2007.
10.2. Informative References
[RFC6106] Jeong, J., Park, S., Beloeil, L., and S. Madanapalli,
"IPv6 Router Advertisement Options for DNS Configuration",
RFC 6106, November 2010.
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Author's Address
Behcet Sarikaya
Huawei USA
5340 Legacy Dr. Building 175
Plano, TX 75024
Phone:
Email: sarikaya@ieee.org
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