-This is used to send back an error packet in response to the matched
-packet: otherwise it is equivalent to
-.B DROP
-so it is a terminating TARGET, ending rule traversal.
-This target is only valid in the
-.BR INPUT ,
-.B FORWARD
-and
-.B OUTPUT
-chains, and user-defined chains which are only called from those
-chains. The following option controls the nature of the error packet
-returned:
-.TP
-.BI "--reject-with " "type"
-The type given can be
-.nf
-.B " icmp-net-unreachable"
-.B " icmp-host-unreachable"
-.B " icmp-port-unreachable"
-.B " icmp-proto-unreachable"
-.B " icmp-net-prohibited"
-.B " icmp-host-prohibited or"
-.B " icmp-admin-prohibited (*)"
-.fi
-which return the appropriate ICMP error message (\fBport-unreachable\fP is
-the default). The option
-.B tcp-reset
-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
-.I ident
-(113/tcp) probes which frequently occur when sending mail to broken mail
-hosts (which won't accept your mail otherwise).
-.TP
-(*) Using icmp-admin-prohibited with kernels that do not support it will result in a plain DROP instead of REJECT