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Networking

Help! I can't get on the network!

Check to make sure you are properly plugged in to the wall. Make sure the network cable is plugged securely in to the wall and then follow it to your computer and make sure it is plugged securely in on that end also. If you still can not access the network, try restarting your computer. If you are still having trouble, give the help desk a call at (412) 268-5881.

I'm using the wireless network and can't access it.

Make sure your wireless card is turned on; most laptops have a on/off switch located on the front or side of the PC. Also, try restarting your computer. If you need more help, call the help desk at (412) 268-5881.

Sometimes I can print quickly, but other times my computer prints slowly or not at all. What causes this?

Don’t forget to double click the "Set Network Drives" icon--it looks like a green tree on the supported laptops. Once you see "Command Completed Successfully" appear twice, (Sometimes you have to wait several minutes) you have created a path to the server EDU1 and to the printers in Tepper.

Updating Your Machine:

Make sure to keep your computer up to date with the latest Microsoft updates. If you do not have the latest Microsoft updates, you will receive a warning message from abuse@andrew.cmu.edu. If you do not update your machine within 24 hours, your computer will be denied access to the network. The best way to avoid being removed from the network is to set your machine to automatically update. You can set this by going into the control panel. You can also periodically check Microsoft's update site, located at http://windowsupdate.microsoft.com, and update all applicable updates. And remember, if you get a warning message, address it immediately.

Network Bandwidth:

No individual service or system running on the wired/wireless network should use more than 10 gigabytes (10GBs) of bandwidth per day, regardless of whether it is inbound or outbound over the commodity network link.

Initial Notification: Initially, a system will trigger an overuse notification if the 5 day average for either inbound or outbound usage exceeds 10 GBs. To calculate a 5 day average, we use the greatest value of inbound or outbound usage per day. These numbers are totaled then averaged.

Averaging high usage over a 5 day time period allows machines infrequent bursts of activity above the daily limit. As long as the usage totals less than 50 GB in a 5 day period, no notification would be issued.

The situation illustrated in the table below WOULD generate an initial overuse notification. However, no notification would be issued if, for example, the spike in inbound usage on Day 2 were only 40 GB (3.5 + 40 + 1.5 + 2 + 1.5 = 48.5 GB/5 = 9.7 GB)

 

Usage Day 1 Day 2 Day 3 Day 4 Day 5 Total/Average
Inbound 3.5 GB 45 GB 1 GB 1 GB 1.5 GB 53.5 /GB/5 = 10.7 GB
Outbound 1 GB 1.5 GB 1.5 GB 2 GB 1 GB


Notice that, in the following example, the average usage for inbound or outbound traffic respectively does not exceed 10 GBs. However, an overuse notification WOULD be issued since the average of the HIGHER of inbound or outbound usage over this five day period exceeds 10 GBs.

 

Usage Day 1 Day 2 Day 3 Day 4 Day 5 Total/Average
Inbound 9 GB 6 GB 7.5 GB 12.5 GB 9.5 GB 53.5 /GB/5 = 26.75 GB
Outbound 3.5 GB 9.5 GB 13 GB 6.5 GB 4 GB

Subsequent Notification: Once an initial overuse notification has been issued, checks on that machine are performed DAILY.

  • A system with over 10 gigabyte usage (inbound or outbound) in one day would immediately exceed the usage guideline. Continued violations will result in further warnings that may eventually lead to loss of network access.
  • A system with 12.5 gigabytes inbound traffic on one day and 15 gigabytes of outbound traffic on a second day would incur two overuse incidents.

In cases where a user has been asked to disable a service, and does not do so, Computing Services may revoke access to the network and initiate appropriate disciplinary procedures against the user. Disciplinary actions may include loss of network access for 45 days.

The web site at http://bandwidth.net.cmu.edu provides access to the Bandwidth Usage Monitoring System that is currently used for Carnegie Mellon's Computing Services wired/wireless and dorm networks. Network usage for the previous five day period is provided.

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