In response to Chuck Swiger <[EMAIL PROTECTED]>:

> On Sep 12, 2006, at 1:08 PM, Bill Moran wrote:
> >> Is there some way to get the FreeBSD system to log machines using
> >> port 25 without interfering with the FreeBSD machine's filtering of
> >> email function?  Or at least make the traffic visible to sniffing
> >> with tcpdump or wireshark or ethereal?
> >
> > Off the top of my head ...
> > ipfw add 25 log tcp from any to any 25
> > should work.  There are certain kernel configs you have to have in
> > place for logging to work, though.
> Better to use something like:
>       ipfw add 1 log tcp from any to me 25 setup

Yeah, that would be more concise.

As a more permanent solution, why not set up ipfw on the FreeBSD
machine to refuse to allow this to happen ever?

ipfw add 5 allow tcp from any to me 25 setup
ipfw add 6 allow tcp from me to any 25 setup
ifpw add 7 drop tcp from any to any 25 setup

I don't remember the rest of the rulset, but if you have an "established"
rule, this should force all SMTP to use this machine as a relay, although
you may need to tweak the rules to get them working right around nat.

Bill Moran
Collaborative Fusion Inc.

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