IP change detection

[chen8002004]

Hi, all:

Currenly, I am using freebsd. I want to detect the IP change from a specific interface. Can anyone give me an example about it? Thank you very much.

Best Regards,
Max

[Touchtecservers]

You want to detect when an ip address has changed on your machine?

usually IP addresses stay the same while they are connected, and only change on disconnect (for PPP or DHCP connections). So why not just check ifconfig then?

[chen8002004]

Thank you Touchtecservers. I use the following command and the problem is solved.

ifconfig | grep -A3 \"%s\" | tail -n1 | awk '{print $2}'