Haven't gotten any response on -questions so trying here. I've also
opened a PR (kern/139226) but it's gotten no replies so I figured I
should try here since I'm not certain if it's a bug or not. Regardless I
am hoping for at least a work-around -- a few extra rules or settings to
keep my console from being flooded by errors. So far only option I found
is commenting out the error display line in the kernel source which is
far from optimal.
I'm trying to setup a stateful firewall for my server such that any
traffic can go out, and it's reply come back -- a fairly typical
workstation setup. 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".
Only seems to happen when I have bind running as a slave dns server (not
publicly listed, just the zone replication traffic causes the error) but
I assume any other large source of UDP traffic would also do it.
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.
I also tried adding at the start "allow { tcp or udp } from any to me
dst-port 53" and "allow { tcp or udp } from me to any uid bind" which
means the keepstate rule shouldn't even be getting hit much, but I still
get a flood of errors.
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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