Re: easy way to scan for issues with path mtu discovery?

["Patrick M. Hausen" <hausen () punkt de>]

Hello,

> Does anyone know of an easy way to scan for issues with path mtu
> discovery along a hop path? E.g. if you think someone is black-holing
> along a route, or even on the endpoint host, could you use some obscure
> nmap flag to find out for sure, and also to identify the offending
> hop/router/host? What tool would you use to test for this, and how
> would you do such a test?

traceroute to identify the outbound route and then iteratively
ping -s <size> for the interesting hops.

Worked sufficiently last time I needed it ;-)

Kind regards,
Patrick M. Hausen
Leiter Netzwerke und Sicherheit
-- 
punkt.de GmbH * Kaiserallee 13a * 76133 Karlsruhe
Tel. 0721 9109 0 * Fax 0721 9109 100
info () punkt de       http://www.punkt.de
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