OpenSolaris_b135/cmd/ipf/examples/example.7

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# block all ICMP packets.
#
block in proto icmp all
#
# allow in ICMP echos and echo-replies.
#
pass in on le1 proto icmp from any to any icmp-type echo
pass in on le1 proto icmp from any to any icmp-type echorep
#
# block all ICMP destination unreachable packets which are port-unreachables
#
block in on le1 proto icmp from any to any icmp-type unreach code 3