Our commodity internet bandwidth (currently 2GBit) is purchased through Windstream, while our server bandwidth is purchased through the University of Massachusetts. Connectivity between colleges is provided by the 10-gigabit Five College fiber-optic network, linking all five campuses in a ring with a single run out of that ring to 1 Federal Street in Springfield. Should that connection fail, we also have connectivity north from the University of Massachusetts through Keene, NH and then to Portsmouth. Each campus has a redundant connection to this ring. At Hampshire, we have one connection in the basement of Cole, and one in ASH.
Hampshire's network is a star topology, centered in the basement of Cole. Our core is a 6509-E with all DFC-enabled cards and Sup720's. In general, buildings are connected to the core with ten-gigabit fiber, and have a layer 3 OSPF networking device with an associated VLAN and subnet. This is to increase resiliency, keep traffic local as much as possible, and reduce the size of the broadcast domains on campus. For security and IP conservation reasons, all of these addresses are RFC1918's that get translated at the edge of our network into globally-valid addresses. All connections made concurrently by a single IP inside our network are mapped to the same IP outside.
We have a ten gigabit physical connection to each of the other four institutions in the Five College Consortium, through the Five College Fiber Network. Any connection initiated from on campus to any of the other four colleges will get routed over this link, meaning we get gigabit speeds between the institutions on the Five College Network. We have firewalls at the edges of our network, one on each link, that perform firewall and NAT functions. On the University of Massachusetts link, this is a Cisco 5525-X, and on the Windstream link, this is a Netgate XG-1541 running pfsense, an open source firewall/router computer software distribution based on FreeBSD.
Hampshire's wireless network is powered primarily by H3C 2620/2620E (a/b/g/n) Access Points at various locations around the campus, ensuring connectivity in all public areas of the campus, as well as all of the dorm areas. Merrill, many academic buildings, and some parts of Enfield and Greenwich have Ubiquiti 802.11ac access points in various flavors, which is what we are migrating to. FPH classrooms mostly have Aerohive 802.11n units. The RCC Gym, has an 8-radio Xirrus array. Academic areas have three separate networks:
In the dorms, the network name matches the housing area, and requires a Hampshire login such as wallace. For instance, in Merrill, the network name is "merrill".
Hampshire College's public-facing IP ranges are as follows:
Internally, we use RFC1918 addresses for all end-user devices.