• Network

The 40m has two networks: 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 and 131.215.115.XXX .

• The wireless router connected to the caltech net has SSID "40m" (2GHz), "40m_5G1" and "40m_5G2" (5GHz). The router is nominally located on the top of the computer rack in the office area.
• 5 wifi repeaters TP-Link RE330 have been installed, one at the vertex, 2 at midpoints of each arm, and at the 2 ends to flood the whole lab with "40m" (2GHz) and "40m_5G1" (5GHz) networks. These allow the use of laptops/phones outside the martian network for googling and remote loging while working in the lab.
• The repeaters can be managed by coonecting to the wifi network and going to 192.168.0.254 or using TP-Link Tether App. The password for all repeaters is usual workstation password of the lab.

Martian network

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

• The wireless network is on the martian network.

• The new net router installed Jun 27, 2018 is controlling all the traffic between the GC net and the martian net.
  • The net router has the outside IP of 131.215.115.200, and internal IP of 192.168.113.2
  • It transmits all the trafic from inside to outside, but does only particular access from outside.
  • nodus.ligo.caltech.edu is now the alias of 131.315.115.200.

  • To ssh to one of the martian computers from a GC computer, ssh into controls@nodus, then use name (or name.martian) for the name. i.e.ssh pianosa.martian 

  • NAT Router setting page: FirewallSetting

• See the Martian host table for IP address assignments on the martian network.

  • When you want to add a new host to the Martian network read this.

Martian Wireless Network

Wifi router

On Jan 6th, 2016, the Martian wifi router was replaced with a Netgear R6400. Link to the corresponding ELOG entry

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

The martian IP address of this unit is 192.168.113.232.

username:

password:

Wireless Bridge for GPIB instruments

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

Device Name: EX3700_1, Fixed IP: 192.168.113.233

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

How_To_Configure_NETGEAR_EX3700

Nameserver and DHCP

chiara runs the DNS and DHCP for the Martian network, set up largely in the manner detailed in this website.

Configuration files can be found at

chiara:/etc/bind/named.conf.local
chiara:/etc/dhcp/dhcpd.conf

and other files in those same directories.

Mount NFS filesystem

If you want to mount the /cvs/cds NFS filesystem on a computer already on the martian network, add the following line to the file /etc/fstab

chiara:/home/cds              /cvs/cds        nfs     rw,bg,nfsvers=3

Then make the directory where the /cvs/cds dir will be mounted, mount the filesystem via

mkdir -p /cvs/cds
sudo mount /cvs/cds