Changes
Corrected details about IPv6
CNS has about 4 Gbps aggregate bandwidth of commodity Internet from its Cogent uplink in the [[Andrews Information Systems Building]], which is fed to campus via redundant fiber connections to both Burruss Hall and Cassell Colliseum. Owens Hall, Hillcrest Hall, and Shanks Hall also serve as routers for some buildings. Additional connections for [[Network Virginia]], [[National LambaRail]], [[Mid-Atlantic Terascale Partnership]], and [[Internet2]] exist at AISB. Nearly all ethernet portals on campus are capable of 100 Mbps or Gigabit speeds, due to fiber interconnects between buildings; however, intrabuilding wiring varies in age and may not support high speeds. The vast majority of campus IPv4s come from two directly-allocated blocks (128.173.0.0/16 and 198.82.0.0/16).
CNS is a leader in the transition to IPv6, as their [[w:Autonomous System|ASN]] consistently ranks in the top 5 in terms of percentage of IPv6 traffic, according to [http://www.worldipv6launch.org/measurements/ World IPv6 Launch Measurements]. A dual-stack topology exists for the entirety of campus, with the notable exception of the main university website. However, Virginia Tech does not currently have use its own assigned IPv6 block(2607:b400::/32); the addresses used are from a /48 sub-allocated from [[w:University of Maryland|UMD]].
In December 2011, CNS announced that a contract had been awarded to IBM and Avaya for ''Unified Communications'', a project to both replace the aging ROLM phone system with SIP phones and upgrade the network infrastructure in each building. This has also somewhat reduced monthly rates of common telephone and ethernet services for departments. While most buildings will be undergoing upgrades through 2014, it is unknown whether or not each will have full gigabit speeds at actual user ports. It is also unknown whether users will be able to use SIP softphones in conjunction with this.