Use of Hubs and Switches on the NJIT Residence Hall Network

The NJIT Residence Hall Network has been seeing 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 the connecting of 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 has implemented hub and switch control throughout the Residence Hall Network.

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 should 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, then you can 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:

If you wish to connect a second device for and extended period of time or more then two devices, then you should connect these devices using a Residential Gateway, much 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. 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:

Students choosing to run wireless 802.11 devices in the residence halls should configure their APs for Channel 1 only.  Set the SSID of the AP to building name, room number, and students UCID.  For example, John Smith with UCID JS999 in room 234 Redwood Hall should set the SSID to  redwood234js999. The APs should be configured to use NAT/PAT and should not be configured as bridges.
Last Updated: June 29, 2017