# $OpenBSD: faq-example1,v 1.5 2006/10/07 04:48:01 mcbride Exp $ # # Firewall for Home or Small Office # http://www.openbsd.org/faq/pf/example1.html # # macros ext_if="fxp0" int_if="xl0" tcp_services="{ 22, 113 }" icmp_types="echoreq" comp3="192.168.0.3" # options set block-policy return set loginterface $ext_if set skip on lo # scrub scrub in # nat/rdr nat on $ext_if inet from !($ext_if) -> ($ext_if:0) nat-anchor "ftp-proxy/*" rdr-anchor "ftp-proxy/*" rdr pass on $int_if proto tcp to port ftp -> 127.0.0.1 port 8021 rdr on $ext_if proto tcp from any to any port 80 -> $comp3 # filter rules block in pass out anchor "ftp-proxy/*" antispoof quick for { lo $int_if } pass in on $ext_if inet proto tcp from any to ($ext_if) port $tcp_services pass in on $ext_if inet proto tcp from any to $comp3 port 80 \ synproxy state pass in inet proto icmp all icmp-type $icmp_types pass quick on $int_if no state