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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@

#	$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
# in /etc/sysctl.conf if packets are to be forwarded between interfaces.

#ext_if="ext0"
#int_if="int0"

#table <spamd-white> persist

#set skip on lo

#scrub in

#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
#rdr pass on $ext_if proto tcp from any to any port smtp \
#	-> 127.0.0.1 port spamd

#anchor "ftp-proxy/*"
#block in
#pass out

#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