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32 lines
1.2 KiB
32 lines
1.2 KiB
This is used to send back an error packet in response to the matched |
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packet: otherwise it is equivalent to |
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.B DROP |
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so it is a terminating TARGET, ending rule traversal. |
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This target is only valid in the |
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.BR INPUT , |
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.B FORWARD |
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and |
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.B OUTPUT |
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chains, and user-defined chains which are only called from those |
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chains. The following option controls the nature of the error packet |
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returned: |
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.TP |
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\fB\-\-reject\-with\fP \fItype\fP |
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The type given can be |
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\fBicmp\-net\-unreachable\fP, |
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\fBicmp\-host\-unreachable\fP, |
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\fBicmp\-port\-unreachable\fP, |
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\fBicmp\-proto\-unreachable\fP, |
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\fBicmp\-net\-prohibited\fP, |
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\fBicmp\-host\-prohibited\fP, or |
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\fBicmp\-admin\-prohibited\fP (*), |
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which return the appropriate ICMP error message (\fBicmp\-port\-unreachable\fP is |
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the default). The option |
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\fBtcp\-reset\fP |
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can be used on rules which only match the TCP protocol: this causes a |
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TCP RST packet to be sent back. This is mainly useful for blocking |
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.I ident |
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(113/tcp) probes which frequently occur when sending mail to broken mail |
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hosts (which won't accept your mail otherwise). |
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.IP |
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(*) Using icmp\-admin\-prohibited with kernels that do not support it will result in a plain DROP instead of REJECT
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