IPv4 MTU detection

[Rubens Kuhl rubensk@localhost]

Hi there.

I've started working with TTM a few days ago and I'm still sorting out 
the tecnology and implementation... one thing though that I couldn't 
find was MTU testing. A large carrier serving our country has suffered 
this year from a failure mode that was really hard to detect: 
load-balancing between multiple paths where some of the paths would have 
a smaller than usual MTU (because it was backup capacity hired from 
another carrier), and having that measurement would have helped.

I noticed that there is IPv6 MTU testing 
(http://www.ripe.net/ttm/Plots/pmtu/tunneldiscovery.cgi) available but 
couldn't find an IPv4 counterpart; is it available somewhere ?


Thanks,
Rubens Kuhl
NIC.br
rubensk@localhost
INOC-DBA 22548*RKJ