Date: Fri, 02 Nov 2001 14:01:28 -0800 From: Lars Eggert <larse@ISI.EDU> To: Barney Wolff <barney@databus.com> Cc: Randall Stewart <randall@stewart.chicago.il.us>, freebsd-net@FreeBSD.ORG, xbone@ISI.EDU Subject: Re: SCTP and multiple default routes Message-ID: <3BE317B8.3040108@isi.edu> References: <3BE30097.C02C828D@stewart.chicago.il.us> <3BE303EA.1040506@isi.edu> <20011102162701.A38190@tp.databus.com>
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Barney Wolff wrote: > Whether or not multiple default routes is a good idea, SCTP-style > multihoming makes a tremendous difference for small organizations > that cannot justify getting a block of addresses big enough to be > routed by multiple providers. With SCTP I can have a host with > an address from a cable-modem provider and another from a dsl provider > and my peers can treat both as addresses of my one machine, so > connections will not break if one link goes down. The big payoff > for the Internet as a whole is I don't need a separate route to me > in the global routing tables. The big drawback is that it requires a completely new protocol... It also requires both peers to speak SCTP, and applications in question must be changed to run over SCTP as well. In other words, it doesn't work yet, and it will be some time before it does, and then only for modified apps. > I would gladly pay for two such links if there were an automatic way > to switch away from a broken link. Without asking cable or dsl > providers to talk bgp to me (which they will surely refuse to do) > this is not easy. You can get the exact same behavior toady, with existing Internet protocols: Create an IP tunnel to the peer over one interface pair, switch the tunnel over to the other pair in case of failure. This is transparent to the application (it uses the virtual addresses of the tunnel), uses existing protocols (TCP/UDP over IP in IP), works now. Only new piece is reconfiguring your tunnel, which is trivial (one or two system commands, and can be easily automated.) But we should probbaly move this discussion over to tsvwg... :-) Lars -- Lars Eggert <larse@isi.edu> Information Sciences Institute http://www.isi.edu/larse/ University of Southern California To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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