# $OpenBSD: pf.conf,v 1.19 2003/03/24 01:47:28 ian Exp $ # # See pf.conf(5) and /usr/share/pf for syntax and examples. # Required order: options, normalization, queueing, translation, filtering. # Macros and tables may be defined and used anywhere. # Note that translation rules are first match while filter rules are last match. # Macros: define common values, so they can be referenced and changed easily. #ext_if="ext0" # replace with actual external interface name i.e., dc0 #int_if="int0" # replace with actual internal interface name i.e., dc1 #internal_net="10.1.1.1/8" #external_addr="192.168.1.1" # Tables: similar to macros, but more flexible for many addresses. #table { 10.0.0.0/8, !10.1.0.0/16, 192.168.0.0/24, 192.168.1.18 } # Options: tune the behavior of pf, default values are given. #set timeout { interval 30, frag 10 } #set timeout { tcp.first 120, tcp.opening 30, tcp.established 86400 } #set timeout { tcp.closing 900, tcp.finwait 45, tcp.closed 90 } #set timeout { udp.first 60, udp.single 30, udp.multiple 60 } #set timeout { icmp.first 20, icmp.error 10 } #set timeout { other.first 60, other.single 30, other.multiple 60 } #set limit { states 10000, frags 5000 } #set loginterface none #set optimization normal #set block-policy drop #set require-order yes # Normalization: reassemble fragments and resolve or reduce traffic ambiguities. #scrub in all # Queueing: rule-based bandwidth control. #altq on $ext_if bandwidth 2Mb cbq queue { dflt, developers, marketing } #queue dflt bandwidth 5% cbq(default) #queue developers bandwidth 80% #queue marketing bandwidth 15% # Translation: specify how addresses are to be mapped or redirected. # nat: packets going out through $ext_if with source address $internal_net will # get translated as coming from the address of $ext_if, a state is created for # such packets, and incoming packets will be redirected to the internal address. #nat on $ext_if from $internal_net to any -> ($ext_if) # rdr: packets coming in on $ext_if with destination $external_addr:1234 will # be redirected to 10.1.1.1:5678. A state is created for such packets, and # outgoing packets will be translated as coming from the external address. #rdr on $ext_if proto tcp from any to $external_addr/32 port 1234 -> 10.1.1.1 port 5678 # rdr outgoing FTP requests to the ftp-proxy #rdr on $int_if proto tcp from any to any port ftp -> 127.0.0.1 port 8021 # spamd-setup puts addresses to be redirected into table . #table persist #no rdr on { lo0, lo1 } from any to any #rdr inet proto tcp from to any port smtp -> 127.0.0.1 port 8025 # Filtering: the implicit first two rules are #pass in all #pass out all # block all incoming packets but allow ssh, pass all outgoing tcp and udp # connections and keep state, logging blocked packets. #block in log all #pass in on $ext_if proto tcp from any to $ext_if port 22 keep state #pass out on $ext_if proto { tcp, udp } all keep state # pass incoming packets destined to the addresses given in table . #pass in on $ext_if proto { tcp, udp } from any to port 80 keep state # pass incoming ports for ftp-proxy #pass in on $ext_if inet proto tcp from any to $ext_if user proxy keep state # assign packets to a queue. #pass out on $ext_if from 192.168.0.0/24 to any keep state queue developers #pass out on $ext_if from 192.168.1.0/24 to any keep state queue marketing