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Annotation of src/share/pf/faq-example1, Revision 1.2

1.2     ! henning     1: # $OpenBSD: faq-example1,v 1.1 2003/08/02 18:25:49 henning Exp $
1.1       henning     2:
                      3: #
                      4: # Firewall for Home or Small Office
1.2     ! henning     5: # http://www.openbsd.org/faq/pf/example1.html
1.1       henning     6: #
                      7:
                      8:
                      9: # macros
                     10: int_if = "fxp0"
                     11: ext_if = "ep0"
                     12:
                     13: tcp_services = "{ 22, 113 }"
                     14: icmp_types = "echoreq"
                     15:
                     16: priv_nets = "{ 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8 }"
                     17:
                     18: # options
                     19: set block-policy return
                     20: set loginterface $ext_if
                     21:
                     22: # scrub
                     23: scrub in all
                     24:
                     25: # nat/rdr
                     26: nat on $ext_if from $int_if:network to any -> ($ext_if)
                     27: rdr on $int_if proto tcp from any to any port 21 -> 127.0.0.1 \
                     28:    port 8021
                     29:
                     30: # filter rules
                     31: block all
                     32:
                     33: pass quick on lo0 all
                     34:
                     35: block drop in  quick on $ext_if from $priv_nets to any
                     36: block drop out quick on $ext_if from any to $priv_nets
                     37:
                     38: pass in on $ext_if inet proto tcp from any to ($ext_if) \
                     39:    port $tcp_services flags S/SA keep state
                     40:
                     41: pass in inet proto icmp all icmp-type $icmp_types keep state
                     42:
                     43: pass in  on $int_if from $int_if:network to any keep state
                     44: pass out on $int_if from any to $int_if:network keep state
                     45:
                     46: pass out on $ext_if proto tcp all modulate state flags S/SA
                     47: pass out on $ext_if proto { udp, icmp } all keep state