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From: David Howells <dhowells@redhat.com>
To: netdev@vger.kernel.org
Cc: Patrick McHardy <kaber@trash.net>
Subject: How to find I/F to destination
Date: Fri, 04 May 2007 13:48:48 +0100	[thread overview]
Message-ID: <5484.1178282928@redhat.com> (raw)


Hi,

I would like to determine through which interface packets sent to a particular
UDP destination will go through, and so determine the MTU size for that
interface.  Can anyone suggest a good way of doing this from within the
kernel?

Doing this will permit AF_RXRPC to obtain a better initial guess as to the
maximum size of the packets that can be sent that way.

I could use the code Patrick gave me to allow AFS to iterate through all the
interfaces and then pick the smallest MTU, but that seems wrong somehow -
though it probably will result in the correct answer 99% of the time.

David

             reply	other threads:[~2007-05-04 12:48 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-05-04 12:48 David Howells [this message]
2007-05-04 12:54 ` How to find I/F to destination Evgeniy Polyakov
2007-05-04 13:04   ` David Howells
2007-05-04 13:06     ` David Howells
2007-05-04 13:08   ` David Howells
2007-05-04 13:16     ` Evgeniy Polyakov
2007-05-04 13:24       ` David Howells
2007-05-04 13:29         ` Evgeniy Polyakov
2007-05-04 13:33           ` David Howells
2007-05-04 13:43             ` Patrick McHardy
2007-05-04 13:55               ` David Howells
2007-05-04 13:59                 ` Patrick McHardy
2007-05-05  9:13                   ` Evgeniy Polyakov
2007-05-05  9:15             ` Evgeniy Polyakov
2007-05-04 13:20     ` Evgeniy Polyakov
2007-05-04 13:23   ` David Howells
2007-05-04 13:25     ` Evgeniy Polyakov
2007-05-04 13:00 ` Patrick McHardy

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