Re: [RRG] GSE?
"Mayutan A." <mayutan.arumaithurai@gmail.com> Wed, 11 June 2008 14:48 UTC
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Date: Wed, 11 Jun 2008 16:48:01 +0200
From: "Mayutan A." <mayutan.arumaithurai@gmail.com>
To: Robin Whittle <rw@firstpr.com.au>
Subject: Re: [RRG] GSE?
Cc: Routing Research Group <rrg@psg.com>, tony.li@tony.li
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Hi, Isn't the Six-One proposal by Christian Vogt an enhancement of the GSE. http://www.watersprings.org/pub/id/draft-vogt-rrg-six-one-01.txt Correct me if I am wrong. Mayutan On Wed, Jun 11, 2008 at 3:55 PM, Robin Whittle <rw@firstpr.com.au> wrote: > Hi Tony, > > You wrote in: > > http://lists.arin.net/pipermail/arin-ppml/2008-June/010988.html > > > Please, please, please go read GSE. You may not like it, you may > > not agree with it, but until you grok it, you haven't seen a big > > chunk of the solution space. > > http://tools.ietf.org/html/draft-ietf-ipngwg-gseaddr-00 > (See quickie summary below my signature.) > > In the context of the RRG potentially forming a consensus that we > don't need to recommend a solution for IPv4, but can rely on some > IPv6-based solution and mass migration to IPv6, I think it is vital > that all significant parts of the IPv6 solution space be considered. > > GSE seems to have been developed briefly around 1997. I understand > that applying it to IPv6 as used today would involve major changes > in routers, host stacks and some or all applications. > > There may well be some major attractions in doing this, if it could > be done, but it sounds like a radical thing on which to bet the > future of the Net. > > Could you or someone else put together a proposal and link to it > from the RRG wiki? An 8 page summary and analysis document would be > good too. > > A crucial part of this would be the time-frame for transitioning the > current IPv6 system to whatever it is you are planning, and then > having a transition plan for most end-users from IPv4 to the new system. > > I think it would also be good to explain why you would prefer to do > this in a hurry for IPv6 - due to whatever urgency you or other > people might think about the IPv4 scaling problem - rather than > fixing the IPv4 problem with a map-encap scheme and then being able > to take more time on whatever it is you propose for IPv6. > > If there was a plan to keep IPv4 going nicely for another decade or > two with map-encap while cooking up something more elegant and > lasting - including perhaps GSE for IPv6 without the need for > map-encap - then I might be able to get enthusiastic about it. > > Still, I think map-encap + TTRs is the way forward for scalable, > generally optimal path mobility. If the GSE system could do > multihoming and portability without the need for map-encap, then > this reduces the scale and cost of the map encap system to that > required for genuinely mobile hosts and networks. > > I understand that a GSE-based solution would not involve > encapsulation at all, and encapsulating IPv6 packets is a more > costly process than IPv4 packets, due to the very long addresses. > I think this is a significant problem for map-encap for IPv6 VoIP > packets. > > - Robin > > > GSE stands for "Global, Site, and End-system address elements". It > is only applicable to IPv6, or to an addressing system with 128 bits. > > The 16 byte IPv6 address is split into 3 pieces: > > 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 > +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ > | Routing Goop | STP| End System Designator | > +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+ > 6+ bytes ~2 bytes 8 bytes > > Routing Goop signifies where the Site attaches to the Global > Internet. The Site Topology Partition (STP) is Site-private "LAN > segment" information. The End System Designator (ESD) specifies > an interface on an end-system. > > The ESD for each host is globally unique. Routing Goop is used by > the global routing system and is rewritten in the destination field > when it arrives at a site. > > I haven't read enough to know how it provides multihoming and > portability (of the ESD part of the address) when changing ISPs. > > One immediate result is that upper-layer protocols must use only > the ESD for purposes such as pseudo-header checksums and the like. > The ESD is the invariant token, the RG is possibly transient > topology information subject to change. > > So how does the Routing Goop and STP get set when the packet leaves > the site for another? Does a router change them or does the sending > host have to get it right. Does there need to be a mapping function > and consequently a mapping database to determine what to set these > to, since the ESD is what uniquely identifies the destination host? > > What lead to the demise of GSE ten years ago? > > -- > to unsubscribe send a message to rrg-request@psg.com with the > word 'unsubscribe' in a single line as the message text body. > archive: <http://psg.com/lists/rrg/> & ftp://psg.com/pub/lists/rrg > -- Mayutan Arumaithurai 0049-551-2712647 (Home number) 0049-176-20322049 (mobile number)
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