Bug 1721 – Path MTU isn't handled properly

Bug 1721 - Path MTU isn't handled properly


Summary:	Path MTU isn't handled properly

Status:	RESOLVED FIXED

Product:	ns-3
Classification:	Unclassified
Component:	ipv6
Version:	ns-3-dev
Hardware:	All All

Importance:	P5 enhancement
Assigned To:	Tommaso Pecorella

URL:
Keywords:

Depends on:
Blocks:
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Reported:	2013-06-25 16:56 UTC by Tommaso Pecorella
Modified:	2013-08-12 00:53 UTC (History)
CC List:	2 users (show)

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Description Tommaso Pecorella 2013-06-25 16:56:54 UTC

Currently the packet MTU is only checked against the local network MTU (link MTU).
While routers do send ICMP_TOO_BIG packets, this isn't considered by the sender node.

http://tools.ietf.org/html/rfc1981 describes the correct methods to handle such cases.

For a decent IPv6 support, this must be fixed as soon as possible. Changes should include a per-connection MTU lookup system, along with refresh timers.

Possible changes include modifying up to the TCP level.

Comment 1 Tommaso Pecorella 2013-07-08 16:51:09 UTC

Code review here:
http://codereview.appspot.com/10779043/

Comment 2 Tom Henderson 2013-08-12 00:21:12 UTC

(In reply to comment #1)
> Code review here:
> http://codereview.appspot.com/10779043/

I'm fine to commit this for ns-3.18.

Comment 3 Tommaso Pecorella 2013-08-12 00:53:31 UTC

Fixed in changeset: 10127:f4cee68de571