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