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Re: [dcp] sequence numbers on resend

Mark Handley <mjh@icir.org> Tue, 07 May 2002 17:13 UTC

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From: Mark Handley <mjh@icir.org>
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To: dcp@ietf.org
cc: "Patrick R. McManus" <mcmanus@ducksong.com>
Subject: Re: [dcp] sequence numbers on resend
In-reply-to: Your message of "Tue, 07 May 2002 10:04:59 PDT." <200205071704.g47H4x610034@coyote.icir.org>
Date: Tue, 07 May 2002 10:13:26 -0700
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>(2) I'm not sure it matters, in practice, whether retransmitted Requests
>have new sequence numbers. Therefore, for consistency, I would choose that
>they would.

The advantage of this is that it's easy to tell which Request packet
got through, so you can initialize RTT measurements correctly.  The
disadvantage would be that you have to be prepared to accept a
Response acking any of the Request sequence numbers you've sent for
this connection.  So using new sequence numbers seems to be a win on
balance, but it is slightly more complex.

 - Mark

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