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SubjectRe: 2.4.20 Broken Path MTU Discovery?
"Carlos Velasco" <> writes:
> ¿May be the Linux box is giving up PMTU? ¿Why? it now knows MTU is 400.
> I have others windows boxes in the network, they work fine with PMTU.

A MTU of 400 is illegal, IPv4 requires a minimum MTU of 576 bytes. Below
it linux uses the minimum MTU and turns off path mtu discovery (=
drops DF)

You can change that minimum mtu by changing the ip_rt_min_pmtu variable
(no sysctl, you have to change it in /dev/kmem or recompile)

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