[Bug 2016] SCTP Support

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2016

--- Comment #11 from Joshua Kinard <kumba at gentoo.org> ---
(In reply to Damien Miller from comment #10)
> What is the benefit for SSH in using SCTP?

The primary feature that I am aware of that SSH would benefit from is
SCTP's built-in multi-homing capability.  So if one connection in a
multi-homed SCTP association broke down for some reason, the session
wouldn't be interrupted because of automatic failover to other
connections.

There's a good whitepaper that discusses additional enhancements, such
as using SCTP's multi-streaming capability to carry SSH's multiple
channels:
http://www.advances.et.put.poznan.pl/issues/5/ATE_issue5_p0097.pdf

But it implies additional changes are needed to SCTP itself (mainly,
definition of new chunk types specific to encryption being the main
ones, of which I believe there are drafts before the IETF for RFC
consideration).

One thing I did notice, was back in OpenSSH 3.7, "implementation
barriers" were removed that would enable SCTP support:
http://www.openssh.com/txt/release-3.7 (~line 67)

So there was some interest over ten years ago in this capability.  What
interest, however, seems to have been lost to the ravages of time.

I haven't exactly stress-tested it or anything, but I figured I'd at
least update the patch to apply against 6.6p1 and then see what
interest, if any, there was :)

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