CT320 Lab Configuration
Overview
CT320 labs (recitations) are held in CSB room 315.
CT320 uses the workstations around the perimeter of the
room—not the center ones.
CT320 workstations have pink labels on their monitors.
It’s ok to have two students to a workstation, but no more than two.
Users & Passwords
- Each machine should have a user
ct320, with a name of
“CT320 User”, and password “ct320”.
It’s a horrible password, but security isn’t an issue, here.
- There is a
root (super-user) account, but it has no password.
You can’t log in as root, but must log in as ct320 and
use sudo to do things that require super-user privilege.
Network configuration
- 192.168.110.0/24 network
-
The IP addresses for this private network are of the
form 192.168.110.suffix, where suffix is 0–255 (more or less).
- Netmask 255.255.255.0
-
- Gateway 192.168.110.1
-
The gateway is an IP address of a router
or computer that provides a route to the world outside of this
network.
- Machines are named
ct320-1, ct320-2, etc. -
Per the pink tag on the monitor.
- Static IP addresses
-
The static IP address for
ct320-suffix is
192.168.110.100+suffix.
For example ct320-4 is IP address 192.168.110.104.
Why 104, rather than just 4? Because the address 192.168.110.1
is already used for the gateway.
- Search domain
-
Specify
cs.colostate.edu as a search domain, so we can use
acushla instead of acushla.cs.colostate.edu.
Services
The lab has a serious network firewall; only certain services are
permitted.
- No DHCP
-
There is no DHCP server on this network.
(OK, sometimes there is, but we don’t want to use it.)
Therefore, static IP addresses (see above) must be manually assigned.
- DNS server is 129.82.45.181
-
The DNS server translates names (e.g.,
denver.cs.colostate.edu,
amazon.com) to ip addresses (129.82.44.141, 54.239.28.85).
You must specify the DNS server as an IP address, not a name. If it
were a name, who would translate it to a number?
- http/https
-
Web browser access (http: and https:) works to the general Internet.
Network OS updates work, because they use http protocol.
- ssh/scp
-
ssh is only permitted to the host
acushla.cs.colostate.edu.
It has all your files on it, just like the CS Department
computers in CSB 120.
However, if you need access to other computers, you can first ssh
to acushla, then ssh to where you need to go from there.
If ssh to acushla fails, then ssh to 192.168.110.1.
- ping
-
Pinging anywhere should work.