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John
sorry to follow up that quickly
John A. Sullivan III wrote:
...
> <snip>
...
>
> Then the OpenVPN server replies saying the MTU is 0:
> Type: 3 (Destination unreachable)
> Code: 4 (Fragmentation needed)
> Checksum: 0x133e [correct]
> MTU of next hop: 0
I looked up the ICMP RFC (792 FYI)
Another case is when a datagram must be fragmented to be forwarded
by a gateway yet the Don't Fragment flag is on. In this case the
gateway must discard the datagram and may return a destination
unreachable message.
It does not appear to mention a MTU size field so your MTU next hop
field may be bogus, It is probably just data in the ICMP packet and
belongs probably to PMTU discovery.
All this smells awfully like a PMTUD Problem.
cheers
Erich
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