''' 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.

|| Gateway    || 192.168.113.2    ||
|| netmask    || 255.255.255.0    ||
|| nameserver || 192.168.113.104  ||
|| nameserver || 131.215.125.1    ||
|| nameserver || 131.215.139.100  ||
|| nameserver || 131.215.254.99   ||

 * 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|Martian host table]] for IP address assignments on the martian network.
    * When you want to add a new host to the Martian network [[CDS/How_to_join_martian | 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 [[https://nodus.ligo.caltech.edu:8081/40m/11916|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 [[https://blogging.dragon.org.uk/dns-with-bind9-and-dhcp-on-ubuntu-14-04/|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}}}