From: John Heffner <jheffner@psc.edu>
To: David Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Subject: Re: MTU probing bug?
Date: Tue, 25 Jul 2006 21:53:01 -0400 [thread overview]
Message-ID: <44C6CAFD.8090107@psc.edu> (raw)
In-Reply-To: <20060725.144225.67885911.davem@davemloft.net>
David Miller wrote:
> I find it interesting that black hole detection is handled
> different from a normal probe failure. I guess here we are
> dealing with a more significant failure, so we should start
> at the thing which is most guarenteed to work.
Black hole detection is substantially different than probe failure.
It's an indication that your current effective MTU is too large, and
must be reduced. A black hole basically means that your current path
information is no good, either because your initial values are wrong, or
the path changed. So, you really want to reset everything to
conservative values. After a failed probe, your effective MTU is still
fine, you've just gotten some additional information about the path
(that it doesn't support the higher MTU).
-John
prev parent reply other threads:[~2006-07-26 1:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-25 7:17 MTU probing bug? David Miller
2006-07-25 13:56 ` John Heffner
2006-07-25 21:42 ` David Miller
2006-07-26 1:53 ` John Heffner [this message]
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