From owner-freebsd-net  Thu Feb 13 16:48:16 2003
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From: "Neeraj Bhatia" <neeraj.bhatia@windriver.com>
To: <freebsd-net@freebsd.org>
Subject: detecting increases in PMTU
Date: Thu, 13 Feb 2003 17:02:34 -0800
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hello All,

I am running Freebsd 4.7 stable release.

in6_mtuexpire is called approximately every MTUTIMO_DEFAULT ie every 1
minute. Shouldn't this value be such that the increases in MTU can be
detected less frequently,in accordance with RFC 1981, Path MTU Discovery for
IPv6. Also the flag RTF_PROBEMTU is not being used at the moment.Please let
me know if I am missing something.
One way would be to handle the issue could be as follows.When sending the
packet out in ip6_output we could check for RTF_PROBEMTU and bring the mtu
value in the route entry back to the link mtu value.

Thx.
-N


===========================
Neeraj Bhatia
IP group, Core Networking
Wind River Networks
(o)510.749.4633
(m)509.475.7106


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