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33 lines
1.4 KiB
33 lines
1.4 KiB
This target provides logging of matching packets. When this target is
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set for a rule, the Linux kernel will pass the packet to the loaded
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logging backend to log the packet. This is usually used in combination
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with nfnetlink_log as logging backend, which will multicast the packet
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through a
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.IR netlink
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socket to the specified multicast group. One or more userspace processes
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may subscribe to the group to receive the packets. Like LOG, this is a
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non-terminating target, i.e. rule traversal continues at the next rule.
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.TP
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\fB\-\-nflog\-group\fP \fInlgroup\fP
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The netlink group (0 - 2^16\-1) to which packets are (only applicable for
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nfnetlink_log). The default value is 0.
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.TP
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\fB\-\-nflog\-prefix\fP \fIprefix\fP
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A prefix string to include in the log message, up to 64 characters
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long, useful for distinguishing messages in the logs.
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.TP
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\fB\-\-nflog\-range\fP \fIsize\fP
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This option has never worked, use --nflog-size instead
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.TP
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\fB\-\-nflog\-size\fP \fIsize\fP
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The number of bytes to be copied to userspace (only applicable for
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nfnetlink_log). nfnetlink_log instances may specify their own
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range, this option overrides it.
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.TP
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\fB\-\-nflog\-threshold\fP \fIsize\fP
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Number of packets to queue inside the kernel before sending them
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to userspace (only applicable for nfnetlink_log). Higher values
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result in less overhead per packet, but increase delay until the
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packets reach userspace. The default value is 1.
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.BR
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