On Mon, Aug 16, 2010 at 5:34 PM, David Woodhouse <[email protected]> wrote: > On Mon, 2010-08-16 at 17:32 -0700, Brent Jones wrote: >> Shouldnt need any ICMP ports open inbound for SMTP, its all TCP. > > There's no such thing as 'ICMP ports'. > > TCP doesn't work if ICMP is blocked. > > -- > dwmw2 > >
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. -- Brent Jones [email protected] -- ## 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/
