Issue in ifplugd?

Denys Vlasenko vda.linux at
Sun Jan 9 19:25:25 UTC 2011

On Saturday 08 January 2011 10:24, Sameer Naik wrote:
> Hi,
> I just configured the busybox-1.15.2 applet ifplugd to monitor the
> "eth0" interface and call "ifup eth0" when the interface link comes up
> and call "ifdown eth0" when the interface link goes down. My
> /etc/ifplugd/ifplugd.action script looks like this.
> -- /etc/ifplugd/ifplugd.action
> #/bin/sh
> echo "link of interface ${1} is ${2}" > /tmp/ifplugd.log
> if [ "${2}" == "up" ]; then
>     ifup ${1}
> else
>     ifdown ${1}
> fi
> -- EOF
> What i am seeing is that when the link comes up the ifup command is
> called and when the link goes down the ifdown command is called. But
> once the ifdown command gets called, ifplugd will no longer be able to
> detect if the link has come up.
> To confirm this i removed the else block from the action script and i
> ifplugd will report the link status whenever is comes up or goes down.
> If i call ifdown eth0 manually, then again ifplugd will stop reporting
> the link status.

What is your network card?
Which detection mode is in use for your interface?
Look for this message in the log:

ifplugd(eth0): using FOO detection mode

If it is in IFF_RUNNING detection mode, "downed" interface
is always seen as unplugged.


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