[CentOS] Sendmail and pmtu discovery

Les Mikesell lesmikesell at gmail.com
Tue Oct 14 17:42:47 UTC 2008


Kai Schaetzl wrote:
> Ralph Angenendt wrote on Tue, 14 Oct 2008 17:24:08 +0200:
> 
>> If you don't know the smallest MTU on the path to the mail server, you
>> might not be able to send packets over that path, especially if DF is
>> set.
> 
> But if it's not set? Shouldn't most devices have it not set?

Routers should fragment as needed and the receiving stack will 
reassemble.  Windows tends to set DF on a lot of packets unnecessarily.

-- 
   Les Mikesell
    lesmikesell at gmail.com


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