Changes

'''NI&S''', previously known as '''Communications Network Services ''' ('''CNS'''), and briefly as ''' Advanced Network Infrastructure and Services''' ('''ANIS''') is a division the ISP of [[Virginia Tech]], and part of the Office [[Division of the Vice President for Information TechnologyIT]], which provides ISP providing services including telephone and Internet to the university. Around 2015, they went through a significant rebranding effort, because of the poor reputation earned by CNS as being "unhelpful, tyrannical network overlords", in the words of a former student. Today, they attempt to exist by their ''Brand Promise'', "Let's explore what's possible together", and ''Brand Character'', "Approachable, Plain Spoken, Collaborative", in order to prevent the need for further rebranding. Several NI&S employees have suggested a more accurate motto would read "F*ck you; we turned it off", in reference to several services essential to the jobs of departmental IT, like rdweb, the "temporary" port 22 block, the L2TP VPN, and several other useful services. Unlike most departments, CNS operates as an auxillary service, and therefore recieves funding through cost-recovery rather than university budgets. Individual departments and students must pay a ''per-port'' charge for each IP or phone device attached to the network.

=== Network Topology ===In Blacksburg, 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 uplinks to both Burruss Hall and Cassell Colliseum. Owens HallAshburn, Virginia, McLean, Hillcrest HallVirginia, and Shanks Hall also serve as routers for some buildingsAtlanta, Georgia. Additional connections for The [[Network VirginiaMid-Atlantic Broadband Communities Corporation]], provides the OC-192 (10 Gigabit) connections to Ashburn and McLean from the [[National Lamba RailAndrews Information Systems Building]], and the OC-192 (10 Gigabit) connection to Atlanta from [[Internet2Hillcrest Hall]] exist at AISB. The vast majority of campus IPv4s come from two directlyIn summer 2015, the OC-192 connection to Ashburn will be upgraded to OC-allocated blocks 768 (128100 Gigabit).173.0.0<ref>[https://16 and 198www.82vtnews.0vt.0edu/16)articles/2015/04/042115-it-gigabits.html]</ref>

CNS For cost-savings reasons, the university's connectivity is a leader primarily provided through an aggregation network shared by several other universities in Virginia, the transition to IPv6[[Mid-Atlantic Research and Education Exchange]] (MREX). MREX, also known as their the [[w:Autonomous System|ASNMid-Atlantic Terascale Partnership]] consistently ranks in the top 5 in terms of percentage of IPv6 traffic, according to (MATP)<ref>[httphttps://wwwbeta.worldipv6launchpeeringdb.orgcom/measurementsnet/ World IPv6 Launch Measurements4326 PeeringDB: Mid-Atlantic Terascale Partnership - MATP]. A dual-stack topology exists </ref>, is operated by Virginia Tech and provides connectivity for the entirety of campus[[Mid-Atlantic Research Infrastructure Alliance]] (MARIA), with the notable exception an alliance of the main university websiteuniversities that receive connectivity through MREX.<ref>[http://www.marialliance. However, Virginia Tech does not currently have its own IPv6 block; the addresses used are from a net/48 subabout-us About Maria -allocated from [[w:University of Maryland|UMDMid-Atlantic Research Infrastructure Alliance]].</ref>

MREX operates two regional hubs: MREX-ATL, at Telx Atlanta, and MREX-DC, at Equinix Ashburn. At each hub, MREX operates a Cisco ASR9006 aggregation router. There is another MREX facility at Level3 McLean, connected as part of a fiber ring that also includes the [[Arlington Research Center]] and the [[Northern Virginia Center]]. At Equinix in [[Ashburn]], MREX-DC has a 100 Gigabit connection to [[Internet2]], 10 Gigabit connections to [[ESnet]] and the Equinix Internet Exchange, and 30 Gigabits of commodity Internet connectivity through Cogent. Virginia Tech also has a 10 Gigabit connection to [[Mid-Atlantic Crossroads]] and a 1 Gigabit connection to [[NetworkVirginia]] here. At Telx in Atlanta, MREX-ATL has 10 Gigabit connections to [[Southern Crossroads]], [[ESnet]], the Telia Internet Exchange, and 30 Gigabits of commodity Internet connectivity through Telia.<ref>[http://www.cafm.vt.edu/busprac/_docs/bpseminar_2014/2014-BusinessPracticeSeminar-Internet.pdf]</ref> MREX-ATL was opened in 2014 and is the first network facility operated by Virginia Tech located outside of Virginia.<ref>[https://www.vtnews.vt.edu/articles/2014/03/032114-it-datanetworkexchange.html]</ref> At Level3 in McLean, MREX's McLean facility, referred to as the National Capital Region (NatCap) Aggregation Facility, has a 10 Gigabit connection to [[Mid-Atlantic Crossroads]] and a connection to [[NetworkVirginia]].<ref>[http://www.cns.vt.edu/docs/NIS_SubcommitteeMinutes07Dec2009.pdf]</ref> From the Andrews Information Systems Building, there are redundant fiber connections to the main campus at both [[Burruss Hall]] and [[Cassell Colliseum]]. [[Owens Hall]], [[Hillcrest Hall]], and [[Shanks Hall]] have intermediate routers for some buildings. 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). === Controversies IPv6 ===* CNS maintains is a 4leader 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.9 GBorg/measurements/day upload cap World IPv6 Launch Measurements]. A dual-stack topology exists for residential usersthe entirety of campus, but not all systems connected to the network are IPv6-enabled. One system that notably lacks connectivity is the main vt.edu website, after which connections is due to a lack of support from the load balancers currently in use. For legacy reasons, Virginia Tech continues to use its /48 sub-allocation from the [[w:University of Maryland|University of Maryland]] on many subnets, although newer equipment is being configured with the assigned IPv6 block (2607:b400::/32). === Unified Communications === 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. == Network Policies ==Contrary to popular belief, CNS does not actively monitor users for torrenting activity; however, they are obligated to forward DMCA notifications to the relevant parties. Residential users that engage in peer-to-peer filesharing are often throttled(according to policy) if their daily upload average exceeds 4.9 GB. Campus-wide intrusion detection systems are deployed through cooperation with the [[IT Security Lab]].* Port security is enabledon most ports, meaning that users are not permitted to attach a switch to the network and must pay for new connections for all devices.While the $20/month fee for gigabit connectivity is generally thought to be reasonable, many department networks require them to evade this restriction through the use of NAT routing, ARP proxies, and/or NDP proxies. For most public portals, MAC address registration is often required, although some department ports are known to not carry this restriction. == Controversies ==In addition to the network policies stated above, the following controversial activities have arisen:* CNS has begun deploying [[w:Network Address Translation | NAT]] to dorm buildings, starting with the [[Ambler Johnston HallGraduate Life Center]]<ref>[http://ipv6.cns. This causes issues for students that need to forward ports for services such as SSHvt. edu/ IPv6 addressesat Virginia Tech]</ref>, however, are globalas it has done in the past with wireless access points.