32 lines
1.2 KiB
Groff
32 lines
1.2 KiB
Groff
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 (\fBicmp\-port\-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).
|
|
.IP
|
|
(*) Using icmp\-admin\-prohibited with kernels that do not support it will result in a plain DROP instead of REJECT
|