NetBSD-5.0.2/regress/sys/kern/ipf/regress/f7

block in proto icmp from any to any icmp-type echo
pass in proto icmp from any to any icmp-type echo
block in proto icmp from any to any icmp-type unreach code 3
pass in proto icmp from any to any icmp-type unreach code 3
block in proto icmp from any to any icmp-type echorep
pass in proto icmp from any to any icmp-type echorep
pass in proto icmp all icmp-type maskreq keep state
pass in proto icmp all icmp-type timest keep state
pass in proto icmp all icmp-type inforeq keep state