On 7/2/10 5:25 PM, Len Conrad wrote:
setting up pf on fbsd 7.2 for host security on a mail gateway.

the only rule for port 25 is:

pass in quick on em0 inet proto tcp from any to $ext_if port = smtp flags S/SA 
keep state

and then last rule:

block drop in log on em0 inet from any to $ext_if

while 1000s of connections to port 25 are getting through with the pass rule, 
several 100 connections are getting blocked with the default block rule, 
bypassing the pass rule.

I can't see how pf is selecting these connections to be blocked.

In what sense are the packets that are getting blocked part of a connection? Are you sure the blocked packets are actually a legitimate first packet, with the appropriate flags set, or is the "flags S/SA" portion of your rule not matching?

--

--Jon Radel
j...@radel.com


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