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+This is used to send back an error packet in response to the matched
+packet: otherwise it is equivalent to
+so it is a terminating TARGET, ending rule traversal.
+This target is only valid in the
+.BR INPUT ,
+chains, and user-defined chains which are only called from those
+chains. The following option controls the nature of the error packet
+.BI "--reject-with " "type"
+The type given can be
+.B " icmp6-no-route"
+.B " no-route"
+.B " icmp6-adm-prohibited"
+.B " adm-prohibited"
+.B " icmp6-addr-unreachable"
+.B " addr-unreach"
+.B " icmp6-port-unreachable"
+.B " port-unreach"
+which return the appropriate IPv6-ICMP error message (\fBport-unreach\fP is
+the default). Finally, the option
+can be used on rules which only match the TCP protocol: this causes a
+TCP RST packet to be sent back. This is mainly useful for blocking
+(113/tcp) probes which frequently occur when sending mail to broken mail
+hosts (which won't accept your mail otherwise).