PF RULES! But mine doesn't ...

[Fafa Hafiz Krantz]

> It's a question of letting DNS traffic _in_ to your nameserver:
>
> pass in on $ext_if inet proto { tcp, udp } \
> 	from any to ($ext_if) port 53
> 
> ^^^ that lets the traffic in....
> 
> pass out on $ext_if inet proto { tcp, udp } \
> 	from ($ext_if) port 53 to any
> 
> ^^^ and that lets it back out.
> 
> If you add the "query-source address * port 53;" to your named.conf
> "options" section, that'll suffice; additionally, since your DNS query
> source port is then predictable, you can drop it from the DNS and NTP
> rule.

Hello again, Jan!

Well, I tried applying what you said now as well as last time you
said it -- but the problem is still there. Unless I uncomment the default
deny policy nothing seems to work. The problem must lie elsewhere in my
ruleset:

int_if="ep0"
ext_if="lnc0"

# *** Options
#
set     block-policy drop

# *** Scrub incoming packets
#
scrub   in all

# *** NAT
#
nat     on $ext_if from $int_if:network to any -> ($ext_if)
rdr     on $int_if proto tcp from any to any \
        port 21 -> 127.0.0.1 port 8021

# *** Default deny policy
#
# block   drop log all

# *** Pass loopback traffic
#
pass    quick on { lo0 $int_if }

# *** Outgoing
#
pass    out on $ext_if inet proto { tcp, udp, icmp } \
        from ($ext_if) to any keep state

# *** DNS
#
pass    in on $ext_if inet proto { tcp, udp } \
        from any to ($ext_if) port 53
pass    out on $ext_if inet proto { tcp, udp } \
        from ($ext_if) port 53 to any

# *** NTP
#
pass    out on $ext_if inet proto udp \
        from ($ext_if) to any port { 53, 123 } keep state

# *** SSH, HTTP and Ident
#
pass    in on $ext_if inet proto tcp \
        from any to ($ext_if) port { 22, 80, 113 } flags S/SA keep state

# *** Active FTP
#
pass    in on $ext_if inet proto tcp \
        from port 20 to ($ext_if) user proxy flags S/SA keep state

# *** Private FTP
#
pass    in on $ext_if proto tcp \
        from any to any port 31337 keep state
pass    in on $ext_if proto tcp \
        from any to any port 53333:55555

--

Fafa Hafiz Krantz
  Research Designer @ http://www.home.no/barbershop
  Enlightened @ http://www.home.no/barbershop/smart/sharon.pdf



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