48 lines
1.1 KiB
Plaintext
48 lines
1.1 KiB
Plaintext
# $OpenBSD: faq-example1,v 1.2 2003/08/06 16:04:45 henning Exp $
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#
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# Firewall for Home or Small Office
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# http://www.openbsd.org/faq/pf/example1.html
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#
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# macros
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int_if = "fxp0"
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ext_if = "ep0"
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tcp_services = "{ 22, 113 }"
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icmp_types = "echoreq"
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priv_nets = "{ 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8 }"
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# options
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set block-policy return
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set loginterface $ext_if
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# scrub
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scrub in all
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# nat/rdr
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nat on $ext_if from $int_if:network to any -> ($ext_if)
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rdr on $int_if proto tcp from any to any port 21 -> 127.0.0.1 \
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port 8021
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# filter rules
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block all
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pass quick on lo0 all
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block drop in quick on $ext_if from $priv_nets to any
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block drop out quick on $ext_if from any to $priv_nets
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pass in on $ext_if inet proto tcp from any to ($ext_if) \
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port $tcp_services flags S/SA keep state
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pass in inet proto icmp all icmp-type $icmp_types keep state
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pass in on $int_if from $int_if:network to any keep state
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pass out on $int_if from any to $int_if:network keep state
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pass out on $ext_if proto tcp all modulate state flags S/SA
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pass out on $ext_if proto { udp, icmp } all keep state
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