Re: Multi-link subnets and MIPv6 (was Re: [Mip6] Re: WG Review: Recharter of Mobility for IPv6 (mip6))
Behcet Sarikaya <behcetsarikaya@yahoo.com> Mon, 02 October 2006 17:16 UTC
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Date: Mon, 02 Oct 2006 12:15:21 -0500
From: Behcet Sarikaya <behcetsarikaya@yahoo.com>
Subject: Re: Multi-link subnets and MIPv6 (was Re: [Mip6] Re: WG Review: Recharter of Mobility for IPv6 (mip6))
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Hello Vijay, I could not see the second quote > A multilink subnet model SHOULD NOT be used. IETF WG's using, or > considering using, multilink subnets today should investigate moving > to one of the other models. For example, Mobile IPv6 should > investigate having the Home Agent not decrement the Hop Limit, and > forward multicast traffic. in Dave's draft, how did you get this? Is there a new version (-01)? Behcet ----- Original Message ---- From: Vijay Devarapalli <vijay.devarapalli@azairenet.com> To: Jari Arkko <jari.arkko@piuha.net> Cc: mip6@ietf.org; Dave Thaler <dthaler@windows.microsoft.com> Sent: Friday, September 29, 2006 4:54:27 PM Subject: Multi-link subnets and MIPv6 (was Re: [Mip6] Re: WG Review: Recharter of Mobility for IPv6 (mip6)) Hi Jari and Dave, Jari Arkko wrote: > Hi Vijay, >> can you send us more information on this? specifically >> on what we are supposed to look for. document problems >> that we might encounter when MIPv6 is run over multilink >> subnets? > The basic reference is the new IAB draft, > draft-iab-multilink-subnet-issues-00.txt. I went through this document. first I was surprised when I saw the following text > However, other WGs continued to allow for this concept even though > it had been rejected in the IPv6 WG. Mobile IPv6 [RFC3775] allows > tunnels to mobile nodes to use the same subnet as a home link, with > the Home Agent doing layer 3 forwarding between them. I was surprised to see the MIPv6 home link and the tunnels to each mobile node being compared to a multi-link subnet. its not a multi-link subnet as described in draft-ietf-ipv6-multilink-subnets-00.txt. the home agent does not bridge and forward link-scope traffic onto the tunnels. the draft later on says > A multilink subnet model SHOULD NOT be used. IETF WG's using, or > considering using, multilink subnets today should investigate moving > to one of the other models. For example, Mobile IPv6 should > investigate having the Home Agent not decrement the Hop Limit, and > forward multicast traffic. currently no link local traffic sent on the home link is forwarded over the Mobile IP tunnel to the mobile node. regarding forwarding multicast traffic RFC 3775 says the following. Interception and tunneling of the following multicast addressed packets on the home network are only done if the home agent supports multicast group membership control messages from the mobile node as described in the next section. Tunneling of multicast packets to a mobile node follows similar limitations to those defined above for unicast packets addressed to the mobile node's link-local and site- local addresses. Multicast packets addressed to a multicast address with link-local scope [3], to which the mobile node is subscribed, MUST NOT be tunneled to the mobile node. These packets SHOULD be silently discarded (after delivering to other local multicast recipients). Multicast packets addressed to a multicast address with a scope larger than link-local, but smaller than global (e.g., site- local and organization-local [3], to which the mobile node is subscribed, SHOULD NOT be tunneled to the mobile node. Multicast packets addressed with a global scope, to which the mobile node has successfully subscribed, MUST be tunneled to the mobile node. > I would like to see documentation of how > Mobile IPv6 is affected, and possibly, a short > RFC that updates RFC 3775 to remove or > reduce the problems. the current use of Mobile IP tunnels as an extension of the home links does not introduce the issues described with multi-link subnets in draft-iab-multilink-subnet-issues. or I might be missing something big. comments? Vijay _______________________________________________ Mip6 mailing list Mip6@ietf.org https://www1.ietf.org/mailman/listinfo/mip6 _______________________________________________ Mip6 mailing list Mip6@ietf.org https://www1.ietf.org/mailman/listinfo/mip6
- Re: Multi-link subnets and MIPv6 (was Re: [Mip6] … Vijay Devarapalli
- Re: Multi-link subnets and MIPv6 (was Re: [Mip6] … Behcet Sarikaya
- Re: Multi-link subnets and MIPv6 (was Re: [Mip6] … Behcet Sarikaya
- Fwd: RE: Multi-link subnets and MIPv6 (was Re: [M… Julien Laganier