Use macros in sample file, ok dhartmei@

src/etc/pf.conf

@@ -1,25 +1,27 @@
-#	$OpenBSD: pf.conf,v 1.6 2002/06/27 07:00:43 fgsch Exp $
+#	$OpenBSD: pf.conf,v 1.7 2002/11/16 12:55:22 ian Exp $
 #
 # See pf.conf(5) for syntax and examples
+# General order: options, scrub rules, NAT/rdr, and filter rules.
+# Note that NAT is first match while packet filters are last match, 
 #
-# replace ext0 with external interface name, 10.0.0.0/8 with internal network
-# and 192.168.1.1 with external address
+ext_if=ext0	# replace with actual external interface name i.e., dc0
+internal_net=10.1.1.1/8
+external_addr=192.168.1.1
 
 # Normalize: reassemble fragments and resolve or reduce traffic ambiguities
-
 # scrub in all
 
-# nat: packets going out through ext0 with source address 10.0.0.0/8 will get
-# translated as coming from 192.168.1.1. a state is created for such packets,
+# nat: packets going out through $ext_if with source address $internal_net will get
+# translated as coming from $external_addr, a state is created for such packets,
 # and incoming packets will be redirected to the internal address.
 
-# nat on ext0 from 10.0.0.0/8 to any -> 192.168.1.1
+# nat on $ext_if from $internal_net to any -> $external_addr
 
-# rdr: packets coming in through ext0 with destination 192.168.1.1:1234 will
-# be redirected to 10.1.1.1:5678. a state is created for such packets, and
+# 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 ext0 proto tcp from any to 192.168.1.1/32 port 1234 -> 10.1.1.1 port 5678
+# rdr on $ext_if proto tcp from any to $external_addr/32 port 1234 -> 10.1.1.1 port 5678
 
 # filter rules
 # the implicit first two rules are
@@ -31,5 +33,5 @@
 # log blocked packets
 
 # block in log all
-# pass  in  on ext0 proto tcp from any to ext0 port 22 keep state
-# pass  out on ext0 proto { tcp, udp } all keep state
+# 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