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Date: Mon, 07 Jul 2003 17:31:42 -0400
From: Chuck Swiger <cswiger@mac.com>
Organization: The Courts of Chaos
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Subject: Re: Logging packets dropped by IPFW
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Tim Kientzle wrote:
> Is there any way to generate log information
> about the packets dropped by IPFW?  The 'log'
> modifier doesn't seem to do anything on my
> system right now <sigh>, though from what I can tell,
> it's supposed to only log the rule that was
> triggered, which isn't the same thing at all.

Did you recompile your kernel with these options:

options IPFIREWALL_VERBOSE      #enable logging to syslogd(8)
options IPFIREWALL_FORWARD      #enable transparent proxy support
options IPFIREWALL_VERBOSE_LIMIT=100    #limit verbosity

...?  Also consider:

sysctl net.inet.tcp.log_in_vain=1
sysctl net.inet.udp.log_in_vain=1

-- 
-Chuck