# $OpenBSD: pf.conf,v 1.8 2002/11/24 19:56:45 pb Exp $ # # See pf.conf(5) for syntax and examples # General order: options, scrub rules, NAT/rdr, and filter rules. # Note that NAT is first match while packet filters are last match, # ext_if="ext0" # replace with actual external interface name i.e., dc0 internal_net="10.1.1.1/8" external_addr="192.168.1.1" # Normalize: reassemble fragments and resolve or reduce traffic ambiguities # scrub in all # nat: packets going out through $ext_if with source address $internal_net will get # translated as coming from $external_addr, a state is created for such packets, # and incoming packets will be redirected to the internal address. # nat on $ext_if from $internal_net to any -> $external_addr # rdr: packets coming in on $ext_if with destination $external_addr:1234 will # be redirected to 10.1.1.1:5678. A state is created for such packets, and # outgoing packets will be translated as coming from the external address. # rdr on $ext_if proto tcp from any to $external_addr/32 port 1234 -> 10.1.1.1 port 5678 # filter rules # the implicit first two rules are # pass in all # pass out all # block all incoming packets but allow ssh, pass all outgoing tcp and udp # connections and keep state # log blocked packets # block in log all # pass in on $ext_if proto tcp from any to $ext_if port 22 keep state # pass out on $ext_if proto { tcp, udp } all keep state