On Tue, Jun 24, 2008 at 10:28:12AM -0400, Darden, Patrick S. wrote: > > > Hi all, > > 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 ICMP 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? Is > there any probing tool that does checks like this automatically? > > Seems to me this happens often enough that someone has probably already > figured it out, so I am trying not to reinvent the wheel. All I can think of > would be to handcraft packets of steadily increasing sizes and look for > replies from each hop on the route (which would be laborious at best). > Google has not been kind to my researches so far.
scamper is the best tool I've found: http://www.wand.net.nz/scamper/ Bill.
