MDM Observatory Network Guide
Updated: 2005 Aug 17 [rwp/osu]
MDM is connected to the Internet via Kitt Peak over a T1 connection
to the Kitt Peak summit.
In addition to the observatory computers, MDM provides a number of
network addresses for guest computers. The main connection points for
visitor machines are the 4-port 10/100 ethernet switches located in the
observing rooms at the 2.4-m and 1.3-m telescopes, and the routers
located in the common areas at both domes (the living room of the 2.4m
and the library of the 1.3m). These latter provide both wired and
wireless ethernet with a fairly restricted range.
MDM provides a number of dynamically allocated (DHCP)
IP numbers for visitor laptops. These are automatically
assigned when you connect to the network.
To connect a laptop, you will need a standard wired
ethernet adapter that can take an Cat5 cable using RJ45
(fat phone plug) connectors. Loaner cables are available from the
mountain personnel on request. Users with standard
802.11b/g wireless network hardware can connect using the
wireless routers when within range (usually just the
living areas and weakly outside).
- Computers connected directly to the local network
via the control room wired switches will be assigned
addesses on the 140.252.83 subnet.
- Computers connected via the living-area routers will
be assigned private network addresses that map to 140.252.83
addresses via the routers.
The staff can offer only limited assistance, so it is expected
that you already know how to connect your laptop to a guest
network in general (this is a very common practice, and hardly
needs to be described in detail anymore). If not, you should
learn before coming to MDM...
The MDM computer network is inside of the KPNO firewall. The only
machine visible to the outside world for *incoming* remote network
connections is the MDM server machine, "mdm". This machine will
only accept encrypted ssh, scp, and sftp connections, as well
as unecrypted http (web) access. No unencrypted interactive
methods (e.g., telnet or ftp, anonymous or otherwise) are supported.
All outgoing traffic from the MDM subnet is open.
While on the mountain network, your laptop has access to other
Each of the control rooms have networked laser printers capable of
single- and double-sided printing. Signs over the printers give
their IP addresses and pointers for downloading drivers if you
wish to print from your laptop while here. However, please be
careful not to waste paper or toner.
- printer driver for WinXP
Readonly Data Access via SAMBA
The data-taking machines provide readonly SAMBA services for local
machines, using the observing accounts. A special SAMBA password
is used (see the whiteboard in each control room for the current
usernames and passwords). If you know how to use SAMBA on your
Windows, Linux, or Mac, you can connect your computer to the data-taking
machine's disk drives directly (without using slow ssh/scp) to make it
easier to copy data onto your personal machines.
In order to protect the data-taking machines, the SAMBA mounts
are currently read-only: you can copy data from the data-taking
machines, but you may not write to them or delete files. For
writing data, please use secure methods like ssh or scp.
Updated: 2005 August 17 [rwp/osu]