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Annotation of src/share/pf/faq-example1, Revision 1.1

1.1     ! henning     1: # $OpenBSD$
        !             2:
        !             3: #
        !             4: # Firewall for Home or Small Office
        !             5: #
        !             6:
        !             7:
        !             8: # macros
        !             9: int_if = "fxp0"
        !            10: ext_if = "ep0"
        !            11:
        !            12: tcp_services = "{ 22, 113 }"
        !            13: icmp_types = "echoreq"
        !            14:
        !            15: priv_nets = "{ 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8 }"
        !            16:
        !            17: # options
        !            18: set block-policy return
        !            19: set loginterface $ext_if
        !            20:
        !            21: # scrub
        !            22: scrub in all
        !            23:
        !            24: # nat/rdr
        !            25: nat on $ext_if from $int_if:network to any -> ($ext_if)
        !            26: rdr on $int_if proto tcp from any to any port 21 -> 127.0.0.1 \
        !            27:    port 8021
        !            28:
        !            29: # filter rules
        !            30: block all
        !            31:
        !            32: pass quick on lo0 all
        !            33:
        !            34: block drop in  quick on $ext_if from $priv_nets to any
        !            35: block drop out quick on $ext_if from any to $priv_nets
        !            36:
        !            37: pass in on $ext_if inet proto tcp from any to ($ext_if) \
        !            38:    port $tcp_services flags S/SA keep state
        !            39:
        !            40: pass in inet proto icmp all icmp-type $icmp_types keep state
        !            41:
        !            42: pass in  on $int_if from $int_if:network to any keep state
        !            43: pass out on $int_if from any to $int_if:network keep state
        !            44:
        !            45: pass out on $ext_if proto tcp all modulate state flags S/SA
        !            46: pass out on $ext_if proto { udp, icmp } all keep state