[Devil-linux-develop] Ethernet Link Detection

[Frischknecht P. <pe...@em...>]

Does anybody have interest in automatic link detection.

The idea is to be able to run scripts based on the link state of the =
card.

This project:
http://0pointer.de/lennart/projects/ifplugd/

It was originally designed for laptops, but we could use it as well.  I =
have already played with it, it works well. =20

Why do I need it? (or want it)
Let's say we are perfiorming an upgrade of some kind to the network.  =
Instead of getting harassing phone calls from users, we simply unplug =
the WAN side of the DL router.  Ifplugd will fire up a script that =
blocks all traffic and redirects WWW to a local web server in the DL box =
itself (say on port 8080).
Example:
iptables -t nat -I PREROUTING -i (LAN interface) -p tcp --dport 80 -j =
REDIRECT --to-port 8080.
The users will now see a page that says: "Sorry for the trouble...we =
will be back up in a little bit.  Go watch TV."

When we plug the WAN port back in, ifplugd automagically removes the =
iptables entries and life is good.
Neat?

Who is interested?