Date: Thu, 7 Jan 1999 11:06:48 +0800 (CST) From: "Yusuf Goolamabbas" <yusufg@huge.net> To: Mike Meyer <mwm@phone.net> Cc: freebsd-questions@FreeBSD.ORG Subject: IPFW prob (was Re: How to allow incoming DNS via 'client' prof in rc.firewall) Message-ID: <13972.9416.159858.358940@yusufg.portal2.com> In-Reply-To: <Pine.BSF.4.05.9901060942080.25797-100000@guru.phone.net> References: <19990106205928.A23282@huge.net> <Pine.BSF.4.05.9901060942080.25797-100000@guru.phone.net>
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Mike, I really appreciate your efforts. Though I am convinced your
rulesets should work, I still have the problem of external DNS queries
Here is the relevant section of my rc.firewall file
Thanks, Yusuf
----------------------------------------------------------------------
$fwcmd add 100 pass all from any to any via lo0
$fwcmd add 200 deny all from any to 127.0.0.0/8
# Allow any traffic to or from my own net.
$fwcmd add pass all from ${ip} to ${net}:${mask}
$fwcmd add pass all from ${net}:${mask} to ${ip}
# Allow TCP through if setup succeeded
$fwcmd add pass tcp from any to any established
# Allow setup of incoming email
$fwcmd add pass tcp from any to ${ip} 25 setup
# Allow access to our DNS (tcp)
$fwcmd add pass tcp from any to ${ip} 53 setup
$fwcmd add pass tcp from ${ip} to any 53
# Allow setup of outgoing TCP connections only
$fwcmd add pass tcp from ${ip} to any setup
# Disallow setup of all other TCP connections
$fwcmd add deny tcp from any to any setup
# Allow access to our DNS (udp)
$fwcmd add pass udp from any to ${ip} 53
# Allow DNS queries out in the world
$fwcmd add pass udp from ${ip} to any 53
# Allow NTP queries out in the world
$fwcmd add pass udp from any 123 to ${ip}
$fwcmd add pass udp from ${ip} to any 123
# Everything else is denied as default.
----------------------------------------------------------------------
Hmm - I missed one. Seems that DNS runs on both UDP and TCP. Try
adding those two as well:
/sbin/ipfw add pass tcp from any to ${ip} 53
/sbin/ipfw add pass tcp from ${ip} any to 53
Note that you need to allow both "setup" and "established" (you were
working with those before), so you might as well allow both. If you've
already got
/sbin/ipfw add pass tcp from any to any established
you can add "setup" to the above two lines for slightly tighter
control.
<mike
On Wed, 6 Jan 1999, Yusuf Goolamabbas wrote:
> Date: Wed, 6 Jan 1999 20:59:28 +0800
> From: Yusuf Goolamabbas <yusufg@huge.net>
> To: Mike Meyer <mwm@phone.net>
> Cc: freebsd-questions@FreeBSD.ORG
> Subject: Re: How to allow incoming DNS via 'client' prof in rc.firewall
>
> > You need to allow both incoming and outgoing packets, and for udp, not
> > tcp. Try:
> >
> > /sbin/ipfw add pass udp from any to ${ip} 53
> > /sbin/ipfw add pass udp from ${ip} to any 53
>
> Hi Mike, I added the first rule (second rule is their as part of
> "client"). However. I get no response when queried from external network
>
> Anything, I could be doing wrong still ?
>
> >
> > <mike
> >
>
> --
> Yusuf Goolamabbas
> yusufg@huge.net
>
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