1 This is used to send back an error packet in response to the matched
2 packet: otherwise it is equivalent to
4 so it is a terminating TARGET, ending rule traversal.
5 This target is only valid in the
10 chains, and user-defined chains which are only called from those
11 chains. The following option controls the nature of the error packet
14 .BI "--reject-with " "type"
17 .B " icmp-net-unreachable"
18 .B " icmp-host-unreachable"
19 .B " icmp-port-unreachable"
20 .B " icmp-proto-unreachable"
21 .B " icmp-net-prohibited"
22 .B " icmp-host-prohibited or"
23 .B " icmp-admin-prohibited (*)"
25 which return the appropriate ICMP error message (\fBport-unreachable\fP is
26 the default). The option
28 can be used on rules which only match the TCP protocol: this causes a
29 TCP RST packet to be sent back. This is mainly useful for blocking
31 (113/tcp) probes which frequently occur when sending mail to broken mail
32 hosts (which won't accept your mail otherwise).
34 (*) Using icmp-admin-prohibited with kernels that do not support it will result in a plain DROP instead of REJECT