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- 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
- \fB\-\-reject\-with\fP \fItype\fP
- The type given can be
- \fBicmp\-net\-unreachable\fP,
- \fBicmp\-host\-unreachable\fP,
- \fBicmp\-port\-unreachable\fP,
- \fBicmp\-proto\-unreachable\fP,
- \fBicmp\-net\-prohibited\fP,
- \fBicmp\-host\-prohibited\fP or
- \fBicmp\-admin\-prohibited\fP (*)
- which return the appropriate ICMP error message (\fBport\-unreachable\fP is
- the default). The option
- \fBtcp\-reset\fP
- 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).
- .PP
- (*) Using icmp\-admin\-prohibited with kernels that do not support it will result in a plain DROP instead of REJECT
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