nanog mailing list archives
Re: multihoming
From: Masataka Ohta <mohta () necom830 hpcl titech ac jp>
Date: Wed, 24 Nov 2021 16:15:55 +0900
Dave Taht wrote:
The proper solution is to have end to end multihoming: https://tools.ietf.org/id/draft-ohta-e2e-multihoming-02.txtI'd never read that. We'd made openwrt in particular use "source specific routing" for ipv6 by default, many years ago, but I don't know to what extent that facility is used.
Considering that most, if not all, multihomed sites should have rich (maybe full) routing table in some part (at least) of the sites between exit routers to balance load between the routers, I can't see why source specific routing was considered necessary only to cause routing loops. For multihoming with PA address ranges with plain TCP/UDP, what is necessary for ISP failure is to have routing protocols to carry proper source address ranges for each routing table entry and to modify end systems to listen to routing protocol and choose proper source address, which is against the poor architecture of IPv6/ND to assume intelligent routers and dumb hosts. But, even with that, if some ISP fails, TCP/UDP through the ISP will fail and must be restarted with new source address, which is not very useful. Moreover, if destination is also inside another multihomed site with PA address ranges, all the destination addresses must be tried. So, as modifying end systems is inevitable, there is no reason not to support full end to end multihoming including modifications to support multiple addresses by TCP and some applications. Masataka Ohta
Current thread:
- Re: is ipv6 fast, was silly Redeploying, (continued)
- Re: is ipv6 fast, was silly Redeploying Masataka Ohta (Nov 20)
- Re: is ipv6 fast, was silly Redeploying Owen DeLong via NANOG (Nov 20)
- Re: is ipv6 fast, was silly Redeploying Masataka Ohta (Nov 21)
- Re: is ipv6 fast, was silly Redeploying Måns Nilsson (Nov 21)
- Re: is ipv6 fast, was silly Redeploying Masataka Ohta (Nov 22)
- Re: is ipv6 fast, was silly Redeploying Owen DeLong via NANOG (Nov 22)
- Re: is ipv6 fast, was silly Redeploying Masataka Ohta (Nov 23)
- Re: is ipv6 fast, was silly Redeploying Owen DeLong via NANOG (Nov 23)
- Re: is ipv6 fast, was silly Redeploying Masataka Ohta (Nov 23)
- multihoming Dave Taht (Nov 23)
- Re: multihoming Masataka Ohta (Nov 23)
- Re: multihoming Baldur Norddahl (Nov 24)
- Re: multihoming Saku Ytti (Nov 24)
- Re: multihoming Christopher Morrow (Nov 24)
- Re: multihoming Geoff Huston (Nov 24)
- Re: multihoming Christopher Morrow (Nov 24)
- Re: multihoming Bjørn Mork (Nov 25)
- Re: multihoming Michael Thomas (Nov 25)
- Re: multihoming Owen DeLong via NANOG (Nov 27)
- Re: multihoming Masataka Ohta via NANOG (Nov 24)
- Re: is ipv6 fast, was silly Redeploying Owen DeLong via NANOG (Nov 21)