We run the following on all macs with a wireless card as a offline policy via Casper at logout.
This script will:
- Enable the wireless service if it’s not been enabled.
- Clear any set DNS servers & search domains (can be turned off for 10.4, reasoning is that 10.5+ can receive DNS from DHCP)
- Turns off the wireless card.
The script itself has been built from a few scripts contained within Caspers Resource Kit & then modified for 10.7+ by myself.