The 40m has two network segments: the LIGO general computing network and an internal "martian" network.

LIGO Caltech network

Martian network

See also Martian Host Table for IP address assignments on the martian network.
When you add a new host to the Martian network, choose a name from Computers and Scripts/Pool of Names for Computers.
To ssh to one of the martian computers from a GC computer, ssh into controls@nodus, then use "name.martian" for the name. i.e. shh allegra.martian (while on nodus). If there's a more efficient way of doing this, that would be good to know too.

The wireless network is part of the Martian Network. The Martian ethernet is bridged to wireless via a Linksys WRT600N wireless router with IP address 131.215.113.220. Note that the wireless access point is only bridging the wired and wireless networks--it does not do NAT. To access the outside world, your network settings should be the same as given above for the Martian network.
You can configure the router by accessing its IP address with a web browser.

The password for configuring the wireless AP is ll_admin.

The manual for the router is here: attachment:WRT600N_Manual.pdf
Here are several screen shots of the configuration screens: attachment:screen1.pdf attachment:screen2.pdf attachment:screen3.pdf attachment:screen4.pdf
Basically, you don't care about the internet setup because you don't connect anything to the WAN port. The physical connection to the router is just one martian LAN cable to one of the LAN ports.
Security is enforced by the MAC address filtering. Only registered machines can connect to the wireless network. Whenever you reset the router (not power cycle), you should register all the lab laptops to the router.
The SSID of the martian wireless network is 40MARS.