On Sat, 21 Nov 2009 16:27:20 +0100 Matthias Apitz <g...@unixarea.de> wrote:
> El día Saturday, November 21, 2009 a las 08:59:12PM +0600, Victor > Lyapunov escribió: > > > Hi all, > > > > I have production network with FreeBSD box acting as firewall. The > > problem emerge as soon as users send mail with attachments. (Sending > > mail without attachments always succeeds). Basically, when a user > > tries to send a message, only part of it transmitted before > > connection is interrupted and sending fails. The problem persists > > only when pf is enabled. > > I think concerning TCP/IP there is no diff between a mail with or w/o > attachment, it is just talking SMTP to a remote server and only the > size, i.e, the number of IP pkgs, differs; the content is anyway; This kind of thing is often due to a mtu blackhole - when a larger email causes a full size IP packet to be sent. I don't see why PF should make a difference though, IFAIK it's supposed to let ICMP through when it's learned state on a tcp connection. > I never used S/SA as flags in my rules, only S. S/SA is correct, it mean look at SYN and ACK and match if only SYN is set, S matches on SYN irrespective of whether ACK is set. _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
