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Annotation of src/etc/pf.conf, Revision 1.19

1.19    ! ian         1: #      $OpenBSD: pf.conf,v 1.18 2003/03/11 10:11:59 david Exp $
1.1       kjell       2: #
1.12      henning     3: # See pf.conf(5) and /usr/share/pf for syntax and examples.
1.17      david       4: # Required order: options, normalization, queueing, translation, filtering.
                      5: # Macros and tables may be defined and used anywhere.
1.12      henning     6: # Note that translation rules are first match while filter rules are last match.
1.18      david       7:
1.12      henning     8: # Macros: define common values, so they can be referenced and changed easily.
1.17      david       9: #ext_if="ext0" # replace with actual external interface name i.e., dc0
1.19    ! ian        10: #int_if="int0" # replace with actual internal interface name i.e., dc1
1.17      david      11: #internal_net="10.1.1.1/8"
                     12: #external_addr="192.168.1.1"
                     13:
                     14: # Tables: similar to macros, but more flexible for many addresses.
                     15: #table <foo> { 10.0.0.0/8, !10.1.0.0/16, 192.168.0.0/24, 192.168.1.18 }
1.5       henning    16:
1.12      henning    17: # Options: tune the behavior of pf, default values are given.
                     18: #set timeout { interval 30, frag 10 }
                     19: #set timeout { tcp.first 120, tcp.opening 30, tcp.established 86400 }
1.13      henning    20: #set timeout { tcp.closing 900, tcp.finwait 45, tcp.closed 90 }
1.12      henning    21: #set timeout { udp.first 60, udp.single 30, udp.multiple 60 }
                     22: #set timeout { icmp.first 20, icmp.error 10 }
                     23: #set timeout { other.first 60, other.single 30, other.multiple 60 }
1.15      dhartmei   24: #set limit { states 10000, frags 5000 }
1.12      henning    25: #set loginterface none
1.14      henning    26: #set optimization normal
1.12      henning    27: #set block-policy drop
                     28: #set require-order yes
                     29:
1.17      david      30: # Normalization: reassemble fragments and resolve or reduce traffic ambiguities.
1.10      deraadt    31: #scrub in all
1.5       henning    32:
1.17      david      33: # Queueing: rule-based bandwidth control.
                     34: #altq on $ext_if bandwidth 2Mb cbq queue { dflt, developers, marketing }
                     35: #queue dflt bandwidth 5% cbq(default)
                     36: #queue developers bandwidth 80%
                     37: #queue marketing  bandwidth 15%
                     38:
                     39: # Translation: specify how addresses are to be mapped or redirected.
1.12      henning    40: # nat: packets going out through $ext_if with source address $internal_net will
                     41: # get translated as coming from the address of $ext_if, a state is created for
                     42: # such packets, and incoming packets will be redirected to the internal address.
                     43: #nat on $ext_if from $internal_net to any -> ($ext_if)
1.4       henning    44:
1.7       ian        45: # rdr: packets coming in on $ext_if with destination $external_addr:1234 will
                     46: # be redirected to 10.1.1.1:5678. A state is created for such packets, and
1.4       henning    47: # outgoing packets will be translated as coming from the external address.
1.10      deraadt    48: #rdr on $ext_if proto tcp from any to $external_addr/32 port 1234 -> 10.1.1.1 port 5678
1.4       henning    49:
1.19    ! ian        50: # rdr outgoing FTP requests to the ftp-proxy
        !            51: #rdr on $int_if proto tcp from any to any port ftp -> 127.0.0.1 port 8021
        !            52:
1.17      david      53: # spamd-setup puts addresses to be redirected into table <spamd>.
1.16      jason      54: #table <spamd> persist
1.12      henning    55: #no rdr on { lo0, lo1 } from any to any
1.17      david      56: #rdr inet proto tcp from <spamd> to any port smtp -> 127.0.0.1 port 8025
1.12      henning    57:
1.17      david      58: # Filtering: the implicit first two rules are
1.10      deraadt    59: #pass in all
                     60: #pass out all
1.4       henning    61:
1.9       henning    62: # block all incoming packets but allow ssh, pass all outgoing tcp and udp
1.12      henning    63: # connections and keep state, logging blocked packets.
1.10      deraadt    64: #block in log all
                     65: #pass  in  on $ext_if proto tcp from any to $ext_if port 22 keep state
                     66: #pass  out on $ext_if proto { tcp, udp } all keep state
1.17      david      67:
                     68: # pass incoming packets destined to the addresses given in table <foo>.
                     69: #pass in on $ext_if proto { tcp, udp } from any to <foo> port 80 keep state
1.19    ! ian        70:
        !            71: # pass incoming ports for ftp-proxy
        !            72: #pass in on $ext_if inet proto tcp from any to $ext_if user proxy keep state
1.17      david      73:
                     74: # assign packets to a queue.
                     75: #pass out on $ext_if from 192.168.0.0/24 to any keep state queue developers
                     76: #pass out on $ext_if from 192.168.1.0/24 to any keep state queue marketing