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#
# block all incoming TCP connections but send back a TCP-RST for ones to
# the ident port
#
block in proto tcp from any to any flags S/SA
block return-rst in quick proto tcp from any to any port = 113 flags S/SA
#
# block all inbound UDP packets and send back an ICMP error.
#
block return-icmp in proto udp from any to any
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