RE: [nemo] new draft
"Pascal Thubert \(pthubert\)" <pthubert@cisco.com> Thu, 02 September 2004 12:27 UTC
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Subject: RE: [nemo] new draft
Date: Thu, 02 Sep 2004 14:05:19 +0200
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Thread-Topic: [nemo] new draft
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Mazen TLAIS <mazentlais@yahoo.fr>, IETF NEMO WG <nemo@ietf.org>
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Cc: "Sri Gundavelli (sgundave)" <sgundave@cisco.com>
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Hi Mazen: I believe that it is pretty natural for a Mobile Router to own more than one egress interface. Typically today, you'll find MRs with a modem and a 802.11 interfaces. It is also expected that you'll find some proprietary logic for a MR to select its interface and its AR over that interface. Sometimes, it's as obvious as: .11 is fast and free, modem is slow and expensive... guess what, modem has a lower priority then WIFI. On the other hand, potential ARs may be on a same (or same type of) egress interface, but they might provide uneven services (nesting level, security, bandwidth). I would really like to see a draft that examines that problem and makes recommendations on how MRs should behave, what should be customizable in the AR selection, etc... if you're interested :) For current implementations or trials, a set of tools are available: RFC 2461: RA is the base tool for all. Proves to be a little slow for mobility RFC 3775: improves ND making RA faster and more verbose. DNA: should go further in NUD but still, the AR is the horizon. draft-ietf-ipv6-router-selection-05.txt helps the node (the MR in our case) select its attachment router based on a preference, and routes if you are lucky enough to find an AR that has a more specific route to home. The draft does not say how the routers negotiate that in the backend and I believe it's a good thing. draft-thubert-tree-discovery-00.txt adds information for nested MRs, and since TD forms trees, Route Information Option from draft-ietf-ipv6-router-selection-05.txt can safely be proxied. Also, it is expected that more metrics - such as bandwidth - will be added to TD to help MRs make even more educated decisions. All have the concept that the MR makes the final decision for AR selection. This can be based on the actual reachability, bandwidth ... it gets by trying the ARs. This can be based on node policies. An external box does not know about all this. Note also that the problem you address is valid for any multihomed node, e.g. a web server. So, conceptually, I'm not too keen in pushing that draft the way it's presented, in terms of architecture and in terms of WG. On the other hand, I agree that there is a need for a gateway that would be placed like the ARC. One example, as we all know it, is a HA for LMM. See draft-droms-nemo-dhcpv6-pd-01.txt for a NEMO version of it. I agree that the reservations can not placed end to end because it's hard to move them when the MR moves, and that it would be cool to place reservations in loose hops, like: MR<->LMM<->HA<->HA<->LMM<->MR Or MR<->LMM<->CR So again, I would like to see a draft describing which functions to place in such gateway... I would also like to see extensions to http://www.ietf.org/internet-drafts/draft-jang-dhc-haopt-00.txt to help locate that gateway and find out about its capabilities, as opposed to overload RAs over and over. What do you think? Pascal
- [nemo] new draft Mazen TLAIS
- Re: [nemo] new draft Mattias Pettersson
- Re: [nemo] new draft Mazen TLAIS
- Re: [nemo] new draft Carlos Jesús Bernardos Cano
- Re: [nemo] new draft Mazen TLAIS
- Re: [nemo] new draft Mattias Pettersson
- Re: [nemo] new draft Mazen TLAIS
- RE: [nemo] new draft Pascal Thubert (pthubert)
- RE: [nemo] new draft Mazen TLAIS