Tom Ivar Helbekkmo wrote:
Bastian Schern wrote:


How I can setup Linux to handle UDP fragments?
There's no setting up to do -- it simply handles them correctly.  Any
IP stack has to.  The problem isn't there, but is an unfortunate
interaction between the sender and gateway/firewalls along the way.

Julio Arruda wrote:

| But....it is quite weird they have such a small MTU. Many websites
| that have problems with Path MTU discovery would be broken by that
| (dumb websites, but still, way too many...).

The web sites in question aren't the problem.  Again, it's things that
happen to the packets along the way that cause communication to fail.
..
Modern Microsoft IP stacks do path MTU discovery by default, which
means that the problem is often seen when accessing IIS web sites.
But it's not "dumb websites", it's dumb firewall administrators. :-)

Humm...I've to disagree..Let me rephrase, I do agree with the despise for the blocking madness, and this is the actual cause for breaking pmtu, BUT, IMHO, a decent TCP stack should BY DEFAULT detect the PMTU Discovery blackhole, and fallback accordingly. That was not the default in MS from what I understand, maybe the fixed it ?
Stealing from someone else "be conservative in its sending behavior, and liberal in its receiving".



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