19d7ccc0fSMax Laier# $FreeBSD$ 29d7ccc0fSMax Laier# $OpenBSD: faq-example1,v 1.2 2003/08/06 16:04:45 henning Exp $ 39d7ccc0fSMax Laier 49d7ccc0fSMax Laier# 59d7ccc0fSMax Laier# Firewall for Home or Small Office 69d7ccc0fSMax Laier# http://www.openbsd.org/faq/pf/example1.html 79d7ccc0fSMax Laier# 89d7ccc0fSMax Laier 99d7ccc0fSMax Laier 109d7ccc0fSMax Laier# macros 119d7ccc0fSMax Laierint_if = "fxp0" 129d7ccc0fSMax Laierext_if = "ep0" 139d7ccc0fSMax Laier 149d7ccc0fSMax Laiertcp_services = "{ 22, 113 }" 159d7ccc0fSMax Laiericmp_types = "echoreq" 169d7ccc0fSMax Laier 179d7ccc0fSMax Laierpriv_nets = "{ 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8 }" 189d7ccc0fSMax Laier 199d7ccc0fSMax Laier# options 209d7ccc0fSMax Laierset block-policy return 219d7ccc0fSMax Laierset loginterface $ext_if 229d7ccc0fSMax Laier 239d7ccc0fSMax Laier# scrub 249d7ccc0fSMax Laierscrub in all 259d7ccc0fSMax Laier 269d7ccc0fSMax Laier# nat/rdr 279d7ccc0fSMax Laiernat on $ext_if from $int_if:network to any -> ($ext_if) 289d7ccc0fSMax Laierrdr on $int_if proto tcp from any to any port 21 -> 127.0.0.1 \ 299d7ccc0fSMax Laier port 8021 309d7ccc0fSMax Laier 319d7ccc0fSMax Laier# filter rules 329d7ccc0fSMax Laierblock all 339d7ccc0fSMax Laier 349d7ccc0fSMax Laierpass quick on lo0 all 359d7ccc0fSMax Laier 369d7ccc0fSMax Laierblock drop in quick on $ext_if from $priv_nets to any 379d7ccc0fSMax Laierblock drop out quick on $ext_if from any to $priv_nets 389d7ccc0fSMax Laier 399d7ccc0fSMax Laierpass in on $ext_if inet proto tcp from any to ($ext_if) \ 409d7ccc0fSMax Laier port $tcp_services flags S/SA keep state 419d7ccc0fSMax Laier 429d7ccc0fSMax Laierpass in inet proto icmp all icmp-type $icmp_types keep state 439d7ccc0fSMax Laier 449d7ccc0fSMax Laierpass in on $int_if from $int_if:network to any keep state 459d7ccc0fSMax Laierpass out on $int_if from any to $int_if:network keep state 469d7ccc0fSMax Laier 479d7ccc0fSMax Laierpass out on $ext_if proto tcp all modulate state flags S/SA 489d7ccc0fSMax Laierpass out on $ext_if proto { udp, icmp } all keep state 49