South Undergraduate Housing - Voice and Network Services

Status Update: January 04, 2007 12:15

Phone Service Update -- UP (Operational)
Wired Networking Update -- UP (Operational), Networks by House
Wireless Networking Update -- UP (Operational)
Blacker, Dabney, Fleming & Ricketts - UP

Please be aware that Wireless Access Points that are not operated by IMSS/Caltech are considered rogue and are to be turned off by their owner(s). Any problems that occur from interfering RF will be refered back to the House Representative for resolution.

Assistance/Problem Reporting Update

Phone problems

  • 626-395-3050 - Phone technical problems
  • 626-395-5995 - Phone billing problems

Network Problems

  • Review this page and the page Student House Network Overview for information.
  • 626-395-3500 - Network Problems.
  • General network problems - (request type IMSS-->Network, Wireless & Remote Access)
  • IP address requests - (request type IMSS-->Network, Wireless & Remote Access-->Host and Address Requests)
  • Wireless networking problems - (request type IMSS-->Network, Wireless & Remote Access-->Cannot connect to-->Wireless)

In order for us to provide you assistance, we need

  1. Complete wall port ID
  2. Physical location (building, room, wall...) in question and neighboring rooms
  3. Your contact information
  4. The times you are available
  5. MAC address of your device and assigned IP (DHCP/static/address)
  6. Detailed information on the problem you are experiencing

IP Addresses/Subnets

House Assignments

  • Student Activities Center (SAC)
  • Blacker House
  • Dabney House
  • Fleming House
  • Ricketts House

Student house labs are assigned to their respective House Nets. Network ports in common areas of the SAC are assigned to the SAC network.

If you need a static address, please submit a request at (request type IMSS-->Network, Wireless & Remote Access-->Host and Address Requests)using the required information listed on the Network Policy Network page.

Network Traffic and Security Policy

Port level security is implemented all wired network ports. In simple terms, this means:

  • Only valid campus IP addresses specific to your network will be passed onto the network.
  • Campus DHCP addresses will be served to all network ports, but DHCP will not be served from your network port to others on the network. This prevents rogue servers from negatively impacting other users on the network.
  • Network ports will pass traffic at all bandwidths to other devices on campus. Commodity Internet is rate limited to reduce abuse.
  • A maximum to 10 MAC addresses will be allowed
  • BPDU network packets sent from a network port results in the network port being temporarily shutdown.
  • Network ports experiencing link-flapping will result in the network port being temporarily shutdown.
  • Excessive DHCP requests will result in the network port being temporarily shutdown.
  • Network Storm Control will result in the network port being temporarily shutdown.
  • MAC addresses showing up on multiple network ports will result in network ports being temporarily shutdown. This includes moving a computer from port to port to try to figure out if there is a network problem.
  • Shutdown network ports will automatically reset after 10 minutes.

Wireless Networking

Wireless networking will be provided for all living spaces on the first and second floors of the SUG and the basement Library in a best effort manner. Wireless networking uses the 2.4 GHz frequency band, an unlicensed frequency band which is subject to interference from other devices. These other devices include, but are not limited to:

  • Microwave ovens
  • Cordless phones
  • Microwave generators (this is listed for the science minded living in the Houses)
  • Rogue Access Points (WiFi devices not run by IMSS)

As a result, the wireless network is considered a supplement network to the wired network installed in the SUG. Please be aware that wireless networking is not a replacement for a wired network port due to the susceptiblity if wireless to outside interference. It is strongly encouraged by IMSS that if there is an application that requires network service, a copper based network port be used even if this means there is a cost for the installation of network ports at a location missing wired network ports. Also be aware that WiFi, by its nature, is a shared medium so the use of end to end encryption protocols is strongly encouranged. For more information on WiFi at Caltech, please visit Campus Wireless Services Overview.

Be aware that there are only three frequencies that do not overlap one another. These frequencies are 1, 6 and 11. IMSS is using these frequencies to provide campus with wireless networking. By selecting a frequency you don't see in use does not mean you will not cause a problem with the campus wireless network.

Rogue Access Points seen on 01/04/2007 that need to be removed from the South Houses:

  • &'/$ |\\|(-`|`
  • berzerker
  • Caltech
  • Cerberus
  • Crusade
  • dirtyJ
  • EmmaWorld
  • Fingalsnet
  • G2net
  • hazinet
  • Hell-Net
  • House of Love
  • kbs2
  • Kee
  • kpu
  • Lloydnet
  • MoNuS
  • pancake
  • Radio Free Blacker
  • Room119Wireless
  • sbc3a
  • Squidward

Detailed Information

Student House Labs There are four House Labs in the SAC. The wired network ports are configured for their respective House Lab Networks. IP addresses 1 through 20 are reserved for House Lab use for printers and computers. Please contact us to update names when you are moving the house lab devices.

Wireless networking is not provided in the House Labs as it was not in the scope of the rehab. Please use the wired network ports to connect your computers to the network to perform your work. If you desire wireless networking in these areas, please speak with Housing or your House Rep to request these additions. Student Activities Center (SAC) The network in the SAC, with rare exception, is not functional as those network drops were not repulled as part of the SUG rehab. Locations with working network drops include:

  • Laundry room - SAC network.
  • Student Library - SAC network until IMSS is notified which Student House Network those two network ports need to be put on.
  • Student House Computer Labs - Respective House Labs.
  • Two rooms south of the Laundry - SAC network.

If there is a location that needs network drops, please submit a request at (request type IMSS-->Network, Wireless & Remote Access-->Other)with an account number for the work to be performed.

Public Network Ports (Network Port Not Where You Need It?)

The South Undergraduate Housing Rehabilitation was very specific in the scope of work to be performed. Housing's decision was to provide one network port per pillow based on the architectural floor plans. In some instances, the usage of rooms changed from the contruction drawings and what occupants are discovering when they move into their rooms.

Network ports were only installed in the student rooms and the Student House Computer Labs. With rare exception, there are no copper network ports in common areas. If there is a need for a network port in a location without network services, please contact Student Housing requesting the correction/addition and submit a request to IMSS at so the Network Operations Group can plan for additional electronics needed to support the addition requests.

North Houses - Network Connectivity

At this time, the North Houses, Caltech Express, Caltech Y buildings, Chandler Dining Hall and the Convenience Store are not connected to the network equipment housed in the SUG. This needs to be changed as these locations are supposed to be fed from the network equipment located at the SUG.

Between January 2007 and March 2007, these buildings will experience various outages as network services are moved from their current routing centers to the SUG. Annoucements will be made prior to those outages.