• Network

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

LIGO Caltech network

• IP addresses on this network are in the form 131.215.114.XXX

Martian network

• IP addresses on the martian network are in the form 192.168.113.XXX

• The wireless network is on the 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.

• ssh pianosa.martian 

Wireless Network

On Jan 6th, 2016, the martian wifi router was replaced to Netgear R6400. Link to the corresponding ELOG entry https://nodus.ligo.caltech.edu:8081/40m/11916

This router supports 2GHz network (11g) named "40MARS" and 5GHz network (11ac) "40MARS_5G". These two SSIDs are hidden.

Wireless Bridge for GPIB instruments

On Jan 8th, 2016, a new wireless bridge (NETGEAR EX3700) for GPIB instruments is installed.

Device Name: EX3700_1, Fixed IP: 192.168.113.233

It accepts ethernet (wired) device with fixed IP of 192.168.113.XXX

HowToConfigureNETGEAREX3700

Below this point the description is too old and is not valild any more (KA, Jan 8, 2016)

Wireless Network

• 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 https://192.168.113.220. 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: WRT600N_Manual.pdf

• Here are several screen shots of the configuration screens: screen1.pdf screen2.pdf screen3.pdf screen4.pdf

• Here is attached the router's configuration file as of June 7, 2011. The router can reload this file if it gets lost or corrupted. MartianRouter.bin

• 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.

Mount linux1

• If you want to mount linux1 on a computer in order to share data on Martian network, add the following line on the file /etc/fstab

• linux1:/home/cds        /cvs/cds                nfs     rw,bg,soft      0 0

• Then make the directory where the linux1 will be mounted on

• {{{ mkdir /cvs && mkdir /cvs/cds

}}}

• Then reboot the computer. If it's mounted correctly you will find some directories under /cvs/cds/

Firewalling by Router:WRT310N

• A firewall is used for network isolation between a new CDS computer and the existing CDS system. It nicely allows to avoid a network conflict. For this purpose, a network router: LINKSYS WRT310N has been employed.

• Anyone can log in to the router by any web browser. The login password is set to admin.