From: Gerrit Renker <gerrit@erg.abdn.ac.uk>
To: dccp@vger.kernel.org
Subject: Re: [PATCH 6/7]: Sample RTT from SYN exchange
Date: Wed, 24 Jan 2007 08:26:54 +0000 [thread overview]
Message-ID: <200701240826.55063@strip-the-willow> (raw)
In-Reply-To: <200701231541.11648@strip-the-willow>
Quoting Ian McDonald:
| Doesn't this rely on the receiver sending back the RTT which
| it can't know at that point of time?? It's only had the request then
| so rtt can only be determined by the receiver. But I could be wrong
| here and I will go back and read the code/rfcs when back at home.
It samples the RTT from the initial SYN (Request/Response) exchange:
* the client adds a timestamp option when sending its Request
* it then enters the REQUEST state and waits for the matching Response
* when the server replies with a timestamp echo option, the client
subtracts this value from t_now, and also the elapsed_time (if supplied)
* if there is no timestamp echo option in the reply, it does not set the field
Using the SYN exchange is suggested both in the erratum to RFC 4342 and in
draft 3448bis.
- Gerrit
prev parent reply other threads:[~2007-01-24 8:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-23 15:41 [PATCH 6/7]: Sample RTT from SYN exchange Gerrit Renker
2007-01-24 3:00 ` Ian McDonald
2007-01-24 8:26 ` Gerrit Renker [this message]
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