# # test ruleset # # allow packets coming from foo to
bar through. # pass in from 10.1.1.2 to 10.2.1.1 # # allow any TCP packets
from the same subnet as foo is on through to host # 10.1.1.2 if they are
destined for port 6667. # pass in proto tcp from 10.2.2.2/24 to 10.1.1.2/32
port = 6667 # # allow in UDP packets which are NOT from port 53 and are
destined for # localhost # pass in proto udp from 10.2.2.2 port != 53 to
localhost # # block all ICMP unreachables. # block in proto icmp from any to
any icmp-type unreach # # allow packets through which have a non-standard IP
header length (ie there # are IP options such as source-routing present). #
pass in from any to any with ipopts