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Re: [tcpinc] Review of draft-bittau-tcpinc-tcpeno-01

Eric Rescorla <ekr@rtfm.com> Fri, 28 August 2015 17:19 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Fri, 28 Aug 2015 10:18:20 -0700
Message-ID: <CABcZeBPVhQ-nJw4zjELXeU8LwhkyMGxi3gEROaEa0iTsjt=y4g@mail.gmail.com>
To: David Mazieres <dm-list-tcpcrypt@scs.stanford.edu>
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Cc: tcpinc <tcpinc@ietf.org>, Kyle Rose <krose@krose.org>, Mirja Kühlewind <mirja.kuehlewind@tik.ee.ethz.ch>
Subject: Re: [tcpinc] Review of draft-bittau-tcpinc-tcpeno-01
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On Thu, Aug 27, 2015 at 11:56 PM, David Mazieres <
dm-list-tcpcrypt@scs.stanford.edu> wrote:

> Eric Rescorla <ekr@rtfm.com> writes:
>
> >>  1. Does TCP-SO really exist in the wild, and if so under what
> >>     circumstances (NAT, no NAT, etc.)?
> >
> > TCP-SO definitely exists in the wild. We do it in Firefox's ICE stack.
>
> So I'm not familiar with ICE over TCP, though I see there's now an
> RFC6544 on this.  Is that what firefox does?  That's great information.
>
> With RFC6544, could the controlling/controlled roles be used to break
> ties?  E.g., with TCP-ENO, could the controlling peer just always set
> b=1?


The problem is that there are situations where each side thinks it is
controlling
("role conflicts"). RFC 5245 has the tiebreaker field to resolve this.

-Ekr

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