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31 lines
1.4 KiB
31 lines
1.4 KiB
This creates an LED-trigger that can then be attached to system indicator
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lights, to blink or illuminate them when certain packets pass through the
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system. One example might be to light up an LED for a few minutes every time
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an SSH connection is made to the local machine. The following options control
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the trigger behavior:
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.TP
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\fB\-\-led\-trigger\-id\fP \fIname\fP
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This is the name given to the LED trigger. The actual name of the trigger
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will be prefixed with "netfilter-".
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.TP
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\fB\-\-led-delay\fP \fIms\fP
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This indicates how long (in milliseconds) the LED should be left illuminated
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when a packet arrives before being switched off again. The default is 0
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(blink as fast as possible.) The special value \fIinf\fP can be given to
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leave the LED on permanently once activated. (In this case the trigger will
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need to be manually detached and reattached to the LED device to switch it
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off again.)
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.TP
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\fB\-\-led\-always\-blink\fP
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Always make the LED blink on packet arrival, even if the LED is already on.
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This allows notification of new packets even with long delay values (which
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otherwise would result in a silent prolonging of the delay time.)
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.TP
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Example:
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.TP
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Create an LED trigger for incoming SSH traffic:
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iptables \-A INPUT \-p tcp \-\-dport 22 \-j LED \-\-led\-trigger\-id ssh
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.TP
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Then attach the new trigger to an LED:
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echo netfilter\-ssh >/sys/class/leds/\fIledname\fP/trigger
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