Re: mss to pmtu clamping partially broken?

[Krzysztof Oledzki <ole@ans.pl>]

On Mon, 2 Jul 2007, Phil Dibowitz wrote:

> On Mon, Jul 02, 2007 at 09:16:57PM +0200, Krzysztof Oledzki wrote:
> > On Mon, 2 Jul 2007, Phil Dibowitz wrote:
> >
> > > 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/
> >
> > Any chances for similar initiative for "SACK vandals"? ;)
>
> There's already a counterpart for ECN blackholes, so I'm not opposed to it.
> However, keeping up with new reports, re-testing existing offenders, etc.
> takes up a good chunk of time, so I don't have the time to do it myself. I'm
> happy to reference such a site, however.

Indeed and it seems there are more important issues, like similar window 
scaling problem for example. :(

Best regards,

				Krzysztof Olędzki