run a command when interface shows

[DemoDoG]

I use a 3g mobile modem and when I attach it I have a driver that automatically starts an interface called hso0.

I wonder if there is a simple way to make FreeBSD perform a certain command whenever network interface hso0 shows up? I would like it to run my connection program so I don't have to start it manually every time.

[tingo]

Not limited to network interfaces - works with all devices. Check out devd and devd.conf man pages. Basically, it can run commands (or scripts) on attach / detach of any device.

[DemoDoG]

Thanx alot it worked flawlessly. How I love fBSD :-)