Changes
IPv6
,Added transition technologies and IPv6 at VT
ip addr show | grep inet6
from a terminal. If there are any lines which end in "global temporary dynamic" or "global secondary dynamic" you're good to go.
==Transition Technologies==
Since some of Blacksburg's ISPs (such as [[gp:Comcast|Comcast]] and [[gp:NTC|NTC]]) still do not support IP, there are several common tools available to enable users to get IPv6 access:
* '''Teredo tunneling:''' This can be done by individual hosts to get an IPv6 address tunneled through a dual-stack server over a TCP port. Public Teredo gateways are available by many providers, including Microsoft, and work through a NAT. While this is handy for public wifi, this does not support reverse DNS, authentication, prefix delegation, or arbitrary address space.<ref>https://www.sixxs.net/faq/connectivity/?faq=comparison</ref>
* '''6to4 tunneling:''' this assigns a /48 block to each global IPv4 address on the internet by encapsulating IPv6 packets within IPv4 packets. This generally must be set-up at the router level, as it cannot traverse NATs automatically. In order to access non-6to4 IPv6 hosts, a relay router must be used at the ISP level. With the advent of tunnel brokers, 6to4 is considered by some to be obsolete. <ref>http://www.kfu.com/~nsayer/6to4/</ref> <ref>https://tools.ietf.org/html/rfc3056</ref>
* '''Tunnel brokers:''' these combine a variety of IPv6 transition methods and allow ISPs to route a portion of their IPv6 address space to users' computers or routers. This is potentially the most robust method, as it supports many different network topologies, reverse DNS, and prefix delegation. Unlike 6to4 and Teredo tunnels, this doesn't necessarily expose the user's IPv4 address. [[gp:Hurricane Electric|Hurricane Electric]] is a popular tunnel broker among VTLUUG members; it assigns a /64 and/or /48 to each user and supports rDNS. <ref>https://www.sixxs.net/faq/connectivity/?faq=comparison</ref>
=Adoption at Virginia Tech=
[[gp:Communications Network Services|CNS]] manages Virginia Tech's network, which has one of the greatest percentage of IPv6 traffic compared to other [[w:Autonomous System|Autonomous Systems]]. <ref>http://www.worldipv6launch.org/measurements/</ref> A dual-stack topology is present for all campus ethernet portals and wireless access points.
The following services still lack IPv6:
* Central web hosting (due to a lack of IPv6 support in the load balancers)
* Campus email (Exchange, legacy POP/SMTP, but not the new Google services)
VT DNS resolvers have AAAA records:
* <code>yardbird.cns.vt.edu 2001:468:c80:2101:0:100:0:22</code>
* <code>jeru.cns.vt.edu 2001:468:c80:4101:0:100:0:42</code>
* <code>milo.cns.vt.edu 2001:468:c80:6101:0:100:0:62</code>
=References=
<references />