Using Hubs and Switches on the NJIT Residence Hall Network

The NJIT Residence Hall Network has had a large increase in computing workstations connected to it. It has been found that this increase is due in part to residents installing hubs or switches connecting multiple computers to the network. We would like to remind residents that connecting hubs or switches to the residence hall network is not permitted. The reason for this is that NJIT provides real public Internet addresses for its residence hall network members. The public address space is limited and there is only one (1) address available to each resident. When a resident connects a hub or switch to the network and exceeds the amount of addresses allocated to them it can prevent another resident from connecting. To stop this from happening in the future, NJIT implemented hub and switch control throughout the residence hall network beginning in the Spring 2006 semester.

Hub and switch control will permit only one active network device to be connected at each residence hall wall plate at any one time. Should a resident connect multiple network devices to their wall plate using a hub or switch, only the first active device will function, all other devices will be inactive. If the hub or switch is a manageable intelligent device, it may count as the first active connection and no other network device will function. If you are using a hub or switch, please remove it, wait at least five (5) minutes and then connect a single network device to the wall plate. The single device should now function. Also, if you move your device to a different wall plate then the one it was first connected to, it may take up to five (5) minute to be come active in the new location.

Should a resident wish to connect more then one computing device, they have different options.

A second infrequently used device:

If you are using a second network device or another device infrequently, remove the primary device from the wall plate and connect the second network device. The second network device should begin to function after one (1) minute. To restore your primary network device, disconnect the second device and reconnect the first - it also should begin to function after one (1) minute.

A second device permanently connected, or three or more devices (Use of residential gateway):

If you wish to connect a second device for an extended period of time or more then two devices, you should connect these devices using a residential gateway, as you would on your personal DSL or cable modem. The residential gateway, with its WAN port connected to your wall plate, will count as your primary connection. Only the WAN port should ever be connected to the NJIT network. You would than create private address space (192.168.x.y) using the gateways routing function on the LAN side. You could then connect all your network devices to the LAN side. Please remember that if your residential gateway supports wireless connectivity, then you should follow these guidelines:

  • Only use the 5 GHz Channels as this will provide the best connections in your room with the least interference.
  • Name your SSID (Wireless network name) your room number and UCID, for example, Laurel210b-xyz123.
    (Never set  your SSID to an NJIT provided SSID this with result in your device being blocked.)
  • Only connect the WAN port to the NJIT Nework wall plate.
  • If supported lower the radio strength to cover only your room.
  • Please try the NJIoT wireless network first, this will allow your to connect most home devices. See: Quick Start Guide for NJIoT 

Click Here for the NJIT Residence Hall Quick Start Guide


Last Updated: October 21, 2019