I'm trying to setup a stateful firewall for my server such that any traffic can go out, and it's reply come back. However I'm getting the error message "ipfw: install_state: entry already present, done" repeated many times in my logs (tho the rules seemed to work fine otherwise).

I stripped down the rules to the minimum I could and discovered the line causing it is "allow udp from me to any keep-state". The similar line for TCP also causes it too if the "setup" keyword is left off. But UDP does not work if I put the setup keyword on it's line (because there is no setup for UDP I assume)


Full firewall rules:

   dns2# ipfw list
   00100 allow ip from any to any via lo0
   00200 deny ip from any to 127.0.0.0/8
   00300 deny ip from 127.0.0.0/8 to any
   00400 allow udp from me to any keep-state
   65535 deny ip from any to any

I found some search results for this error message, but none seem to have a solution to the problem.

System info:
dns2# uname -a
FreeBSD dns2 7.2-RELEASE-p2 FreeBSD 7.2-RELEASE-p2 #0: Wed Jun 24 00:14:35 UTC 2009 r...@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64

Hardware: virtual server under vmWare ESXi (not that that should matter)

network card: em0


--
Chris St Denis
Programmer
SmarttNet (www.smartt.com)
Ph: 604-473-9700 Ext. 200
-------------------------------------------
"Smart Internet Solutions For Businesses"
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