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SubjectRe: mss to pmtu clamping partially broken?
On Mon, Jul 02, 2007 at 07:04:12PM +0200, Andreas Steinmetz wrote:
> Jan Engelhardt wrote:
> > Do you really need clamping? It's a hack, since TCP should do MSS negotiation
> > itself. (Of course it may happen that some routers are broken.) But usually not
> > for incoming packets.
>
> You never know when you hit ICMP blackholes, broken routers and other
> evil things. Better safe than sorry so clamping is the way to go for me.

I encourage you to report PMTUD Blackholes to the MSS Initiative at
http://www.phildev.net/mss/

We'll notify them, and if we can't get them to fix it, blacklist them. We have
more fixed sites than blacklisted sites, so it's at least somewhat successful.

--
Phil Dibowitz phil@ipom.com
Open Source software and tech docs Insanity Palace of Metallica
http://www.phildev.net/ http://www.ipom.com/

"Never write it in C if you can do it in 'awk';
Never do it in 'awk' if 'sed' can handle it;
Never use 'sed' when 'tr' can do the job;
Never invoke 'tr' when 'cat' is sufficient;
Avoid using 'cat' whenever possible" -- Taylor's Laws of Programming

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