On Sat, Aug 28, 2010 at 10:49, John Jason Brzozowski <john_brzozow...@cable.comcast.com> wrote:
> > As we started our IPv6 trials, we began to observe an increase in 6to4 relay > traffic. 6to4 is a transition mechanism built into some operating systems > and home gateways. While it is not a transition technology that Comcast > planned to invest in due to limitations related to performance, we did > observe poor performance when 6to4 was used by our customers. In many cases, > these customers were not even aware that 6to4 was enabled by default or that > their device or operating system was attempting to use 6to4 to communicate > with IPv6 resources on the Internet. > > In most cases, we observed that 6to4-enabled operating systems and devices > were attempting to use a 6to4 relay infrastructure hosted by a midwestern > university. In order to improve the Internet experience for Comcast > customers who are using 6to4, whether knowingly or not, we have decided to > operate 6to4 relays on a temporary, trial basis. > > Comcast has decided to deploy 6to4 relays in five locations around our > network to improve performance and predictability, as compared to operating > relays from a single location. These 6to4 relays are available via the > standard 6to4 Anycast IP address, according to RFC 3068, which is > 192.88.99.1. Devices attempting to use 6to4 within our network should > automatically discover and utilize these new 6to4 relays, without end user > intervention or configuration. > > The first pair of these relays was activated today. We plan to activate the > remaining three within the next seven to ten days. We plan to monitor the > performance of the 6to4 relays, to measure any beneficial effects resulting > from adding these elements to our network. As our IPv6 trials evolve and we > develop our plans for 2011 and beyond, we will assess our plans to support > 6to4 moving forward. > Hi John, First of all, that's great news -- I think it will help a lot. Have you also considered deploying Teredo relays? I'm guessing that there are quite a few Windows Vista+ systems that could benefit from having a few closer Teredo relays and it's probably a similar amount of traffic that you're seeing compared to 6to4 tunnels. Best, Bill Fehring