add configuration examples to the default pf.conf file (commented out):

- rdr-anchor "relayd/*": the anchor used by relayd to load
redirections into pf.
- pass in on $ext_if proto icmp to ($ext_if): it is a bad habit to
block icmp, this example proposes to allow it by default.
ok henning@

src/etc/pf.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: pf.conf,v 1.34 2007/02/24 19:30:59 millert Exp $
+#	$OpenBSD: pf.conf,v 1.35 2008/02/29 17:04:55 reyk Exp $
 #
 # See pf.conf(5) and /usr/share/pf for syntax and examples.
 # Remember to set net.inet.ip.forwarding=1 and/or net.inet6.ip6.forwarding=1
@@ -15,6 +15,7 @@
 
 #nat-anchor "ftp-proxy/*"
 #rdr-anchor "ftp-proxy/*"
+#rdr-anchor "relayd/*"
 #nat on $ext_if from !($ext_if) -> ($ext_if:0)
 #rdr pass on $int_if proto tcp to port ftp -> 127.0.0.1 port 8021
 #no rdr on $ext_if proto tcp from <spamd-white> to any port smtp
@@ -28,6 +29,7 @@
 #pass quick on $int_if no state
 #antispoof quick for { lo $int_if }
 
+#pass in on $ext_if proto icmp to ($ext_if)
 #pass in on $ext_if proto tcp to ($ext_if) port ssh
 #pass in log on $ext_if proto tcp to ($ext_if) port smtp
 #pass out log on $ext_if proto tcp from ($ext_if) to port smtp