32 lines
1.1 KiB
Groff
32 lines
1.1 KiB
Groff
Turn on kernel logging of matching packets. When this option is set
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for a rule, the Linux kernel will print some information on all
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matching packets (like most IP header fields) via the kernel log
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(where it can be read with
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.I dmesg
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or
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.IR syslogd (8)).
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This is a "non-terminating target", i.e. rule traversal continues at
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the next rule. So if you want to LOG the packets you refuse, use two
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separate rules with the same matching criteria, first using target LOG
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then DROP (or REJECT).
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.TP
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\fB\-\-log\-level\fP \fIlevel\fP
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Level of logging (numeric or see \fIsyslog.conf\fP(5)).
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.TP
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\fB\-\-log\-prefix\fP \fIprefix\fP
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Prefix log messages with the specified prefix; up to 29 letters long,
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and useful for distinguishing messages in the logs.
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.TP
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\fB\-\-log\-tcp\-sequence\fP
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Log TCP sequence numbers. This is a security risk if the log is
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readable by users.
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.TP
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\fB\-\-log\-tcp\-options\fP
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Log options from the TCP packet header.
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.TP
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\fB\-\-log\-ip\-options\fP
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Log options from the IP packet header.
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.TP
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\fB\-\-log\-uid\fP
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Log the userid of the process which generated the packet.
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