ipfw denial log - what's this mean?

Rob bitabyss at gmail.com
Thu Apr 10 18:55:18 UTC 2008

Hi Everyone,

My 6.2-Release system coughed up a report of denied packets from ipfw in its daily security run:

ipfw denied packets:
+++ /tmp/security.gnkQg5CA	Thu Apr 10 03:04:15 2008
+00200        12         795 deny ip from any to

What does this mean?  I understand that's the loopback interface, but I'm not terribly knowledgeable on ipfw.  Is this some crack attempt, or normal background noise?  I don't understand how lo0 would ever see any IP addresses other than its own?!

The whole rule set looks like this:

# ipfw show
00100   4749394  1011660210 allow ip from any to any via lo0
00200        12         795 deny ip from any to
00300         0           0 deny ip from to any
01005  17272713  2535346056 fwd tcp from to any out
65000 174044808 81045388703 allow ip from any to any
65535         1         328 deny ip from any to any

  -Thanks, Rob

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