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FAQ/ Network

Locating an available network port (aka cable ID)

Soda Hall

The ports are located in rectangular floorboxes; there are generally at least a couple in each room. Each floorbox has a pair of phone jacks on the left, power in the middle, and RJ-45 Ethernet ports on the right. The ports are numbered with Cable ID numbers ending in B or C (the jacks with Cable IDs ending in 'A' are phone jacks). An example of a Cable ID in Soda Hall is '3A-075-B'. (Note: In the past, Soda Hall Cable IDs were represented without hyphens (e.g. '3A075B'). As of March 2003 this usage has been discontinued in favor of the hyphenated version, which corresponds to the actual labels that you will see in Soda Hall offices.)

Cory Hall

The ports are located in white boxes, generally mounted on the walls. Each box may have 1, 2, 4, 8 or more ports. Each port is labeled on the front of the box. The Cable IDs in Cory identify the endpoints of the cable - the first number will be the wiring closet and is in general the same on each floor. The second number is the room where the port is located. The third number is a unique number for each port in that room. An example of a Cable ID in Cory Hall is '315-395-001'.

Sutardja Dai Hall

In offices, network ports are built into the walls, 18 inches above the floor. In open spaces, network ports are built into the baseboard of the cubicle walls. In general, each location has one BLUE data port and one WHITE phone port. Like in Cory, the printed numbers identify the endpoints of the cable. The first number is the wiring closet, the second is the room where the port is located, and the third is a unique identifier in the room. In Sutardja Dai, which follows the current campus labeling standard, an additional suffix identifies the type of cable; "D" for data cables, or "V" for voice cables. An example of a Cable ID in Sutardja Dai Hall is '671-630-003-D'.

Finding IP address and MAC address


  1. Click on Start → Run. Screenshot of the Windows 'Start' button pressed and the 'Run' option highlighted.
  2. Type command in the Run dialog box. Screenshot of the text 'command' entered into the 'Run' dialog box.
  3. Type ipconfig /all and press Enter. Screenshot of 'ipconfig /all' typed at the Windows command prompt.

    You should see output similar to the following (Windows refers to the MAC address as “Physical Address”).

    Screenshot of the output produced by running the 'ipconfig /all' command on a Windows machine.

Unix Systems

Type nslookup <computer-name> (Example: nslookup divine)

Screenshot of 'nslookup' output for 'divine'.

To find the MAC address on a Sun OS, Solaris, Linux, FreeBSD, or NetBSD machine; use the ifconfig -a command (as root) and look at the output for the relevant interface.

For HP-UX machines, use the lanscan command.


The MAC address can be found with the TCP/IP control panel.

From the Finder, click on the Apple menu (top left) and choose Control Panels -> TCP/IP. When that is open, click the 'Info' button, and it will show you the "Hardware Address", which is what the Macintosh call the MAC address.

Macintosh tends to not load drivers until they are needed. You can try clicking on the "Options" button in the TCP/IP control panel and seeing if you can force it to be "Active" (by default, it is set to "Load only when needed", which might prevent the MAC address from being available.)

Who is my Research Support Officer?

A Research Support Officer (or RSO) oversees distribution of funds from University accounting sources (e.g. research grants). Each faculty member usually has a single RSO. If you are a a student, look for your advisor on this list to find their corresponding RSO. Otherwise, ask your EECS account sponsor, advisor or supervisor.

Configuring modem/dial-up Service

EECS discontinued support for its modem pool on July 1 1999. 

UC Berkeley stopped offering dialup service in December 2008.

Building cable/wiring Diagrams

How to Setup a Student/Class Account

Visit http://www-inst.eecs.berkeley.edu/~iesg/new-users.html for more information.

See also

Is this network port active?

Use the IRIS Network Query Forms

See also

Is my machine supported by CUSG?

  1. Click here.
  2. In the field List Hosts whose name starts with, fill in the name of your computer (Finding out the name of your computer) and click List Contracts. Screenshot of the CUSG query form with the example machine name 'helpme' filled in the 'List Hosts whose name starts with' field.

Finding Out the Name of Your Computer

  1. On your desktop, right click on My Computer and click on Properties. Screenshot showing the 'Properties' option highlighted on the flyout menu produced after right-clicking on 'My Computer.'
  2. Click on the Network Identification and look for your computer name. Screenshot showing the 'Network Identification' tab of the 'System Properties' menu.

Reporting Network Problems

Please fill out a Network Problem Report

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