Subject: Re: Path MTU discovery
To: Matthias Scheler <firstname.lastname@example.org>
From: Kevin M. Lahey <email@example.com>
Date: 10/28/1997 13:13:04
In message <firstname.lastname@example.org>Matthias Scheler writes
>I have two questions concerning the path MTU discovery support in
>1.) Does it actually work?
[Example of it obviously not working deleted...]
> Has anybody successfully tried path MTU discovery?
I tested it before committing it, but I'd like to hear from anybody
else who has had experience with it (good or bad). I've just tested
it along a similar path, and it worked, but that doesn't mean much.
I'll try to actually set up a test to your host...
>2.) How can I list the MTU values which got discovered?
In netstat -r, you can see the routes that got added by MTU discovery,
the should have the 'UGHD' route flags set (which, BTW, is the
same as the flags for a redirect). They should have associated
mtu's, which should be what the system is using to determine the
size of packets to output.