On Mon, 2010-08-16 at 17:46 -0700, Brent Jones wrote: > I guess I should clarify, ICMP 'types'. :) > > I've seen rare situations where PMTUD breaks past a firewall that > blocks all ICMP types. But I've tested with all ICMP blocked and only > under certain situations where the remote side found an odd MTU would > it break. But it could very well likely happen more often than that in > the wild.
Anyone using PPPoE will have such an 'odd MTU'. That includes a *lot* of cable and ADSL users. It's extremely common to find PMTU black holes where some idiot has decided it would be clever to block ICMP without really understanding what they're doing. -- dwmw2 -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
