[Openswan Users] MTU again (netkey fragmentation)
paul at xelerance.com
Thu Mar 1 14:22:47 EST 2007
On Fri, 2 Mar 2007, Cameron Davidson wrote:
> It shouldn't be - the server is supposed to resend the packet with a
> smaller size. That is the entire point of DF and PMTU discovery.
> Most likely Benny is right - the "server" (you did say it was XP at both
> ends) is not getting the ICMP fragmentation needed messages.
> Have you run wireshark on the server? Have you checked the firewalls on
> the machine receiving these messages?
Note that because of IPsec, it is not always possible for ICMP messages
to get from a router in the middle back to the machine behind the IPsec
server to tell it to lower its mtu. That's why we need to handle this
on the ipsec server.
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