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Re: PF and DNS requests
- To: misc_(_at_)_openbsd_(_dot_)_org
- Subject: Re: PF and DNS requests
- From: Jason Opperisano <opie_(_at_)_817west_(_dot_)_com>
- Date: Wed, 29 Dec 2004 15:58:40 -0500
On Wed, 2004-12-29 at 14:38, Mark Nelson wrote:
> I've just rebuilt my firewall using OpenBSD 3.5, (previously it was
> running on NetBSD). I'm now having problems resolving DNS requests from
> my DMZ. I have the following rules in pf.conf -
> pass in quick log on $external_if proto udp from any to 126.96.36.199/32
> port 53 keep state
> pass in quick on $dmz_if proto udp from any to 188.8.131.52 port 53
> keep state
> block in quick log on $external_if from any to any
> According to tcpdump, I get the following -
> Dec 29 19:34:09.116338 rule 4/0(match): pass in on xl2:
> 184.108.40.206.35915 > 220.127.116.11.53: 36873% [1au][|domain]
> Dec 2919:34:09.179994 rule 58/0(match): block in on xl0:
> 18.104.22.168.53 > 22.214.171.124.35915: 36873*[|domain] (DF)
> When I remove the block line everything works.
> It look like to me (I could be wrong) is that the firewall is not
> keeping state.
> Any suggestions ?
it's hard to tell from the info you provide what is what. if you are
trying to allow DNS name resolution requests from machines in your DMZ
to a DNS server on the internet:
pass in quick on $dmz_if inet proto udp from $dmz_if:network \
to $dns_server port = 53 keep state
pass out quick on $external_if inet proto udp \
from $dmz:network to $dns_server port = 53 keep state
would be the way i'd do it.
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