RE: fragmentation of a datagram
Ben,
> Date: Tue, 30 Jun 2009 19:03:32 +0100
> From: ben@decadent.org.uk
>> Can the Linux router operate so that it simply sends
>> datagrams to the client without involvement of PMTUD?
>
> I don't understand. I thought the problem was that some of the client's
> *outgoing* packets were being dropped due to exceeding the MTU on the
> WAN link and being non-fragmentable. You can fix that by lowering the
> MTU between client and remote systems; either by PMTUD or by changing it
> on the local link.
Cancel my question above. It makes no sense.
Last week the problem disappeared as mysteriously
as it appeared a year or so back. Ie. the non-Linux
client can again send messages by SMTP and files
by FTP with no problems. Consistent with your
comments above, ifconfig now reports MTU:1500.
Presumeably set by the ISP dhcp server.
So I should check that the non-Linux system really
is setting the DF bit.
Thanks, ... p. crawford
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