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Annotation of src/etc/pf.conf, Revision 1.9

1.9     ! henning     1: #      $OpenBSD: pf.conf,v 1.8 2002/11/24 19:56:45 pb Exp $
1.1       kjell       2: #
1.2       smart       3: # See pf.conf(5) for syntax and examples
1.7       ian         4: # General order: options, scrub rules, NAT/rdr, and filter rules.
1.9     ! henning     5: # Note that NAT is first match while packet filters are last match,
1.4       henning     6: #
1.8       pb          7: ext_if="ext0"  # replace with actual external interface name i.e., dc0
                      8: internal_net="10.1.1.1/8"
                      9: external_addr="192.168.1.1"
1.5       henning    10:
1.6       fgsch      11: # Normalize: reassemble fragments and resolve or reduce traffic ambiguities
1.5       henning    12: # scrub in all
                     13:
1.7       ian        14: # nat: packets going out through $ext_if with source address $internal_net will get
                     15: # translated as coming from $external_addr, a state is created for such packets,
1.4       henning    16: # and incoming packets will be redirected to the internal address.
                     17:
1.7       ian        18: # nat on $ext_if from $internal_net to any -> $external_addr
1.4       henning    19:
1.7       ian        20: # rdr: packets coming in on $ext_if with destination $external_addr:1234 will
                     21: # be redirected to 10.1.1.1:5678. A state is created for such packets, and
1.4       henning    22: # outgoing packets will be translated as coming from the external address.
1.1       kjell      23:
1.7       ian        24: # rdr on $ext_if proto tcp from any to $external_addr/32 port 1234 -> 10.1.1.1 port 5678
1.4       henning    25:
                     26: # filter rules
                     27: # the implicit first two rules are
1.1       kjell      28: # pass in all
                     29: # pass out all
1.4       henning    30:
1.9     ! henning    31: # block all incoming packets but allow ssh, pass all outgoing tcp and udp
1.4       henning    32: # connections and keep state
1.6       fgsch      33: # log blocked packets
1.4       henning    34:
                     35: # block in log all
1.7       ian        36: # pass  in  on $ext_if proto tcp from any to $ext_if port 22 keep state
                     37: # pass  out on $ext_if proto { tcp, udp } all keep state