Before we turned up our own relays the closest 6to4 relay was a single relay hosted by a mid-western university. Regardless where the next closest relays are located deploying our own resulted in improvements (as you pointed out below).
John On 8/29/10 12:24 PM, "Joel Jaeggli" <joe...@bogus.com> wrote: > On 8/29/10 6:25 AM, John Jason Brzozowski wrote: >> Franck, >> >> As you know 6to4 is enabled by default in many cases and is used perhaps >> more than folks realize. Because of this and other observations we decided >> to deploy our own relays. > > Right prior to this the nearest 6to4 relay router from the vantage-point > of comcast customers was at AMSIX. It's a given that you're going to > have path asymmetry, in this case however it was frequently worse in one > direction than in the other. > > This ought greatly improve the performance of existing devices located > at comcast's customers. > >> This does not alter our plans for our native dual stack trials, in fact, I >> hope to have more news on this front soon. >> >> It is true that 6to4 has challenges, some of these may be related to how >> 6to4 relays have been deployed. Others may be related to the protocol >> itself. Either way, by deploying our own we observed an improvement, we >> hope others have as well. >> >> John >> >> On 8/28/10 6:06 PM, "Franck Martin" <fra...@genius.com> wrote: >> >>> These are good news. >>> >>> However, if Comcast provides native IPv6 to their customers, then the IPv6 >>> native customers don't need these 6to4 relays? >>> >>> Airport Extreme, Linksys and other user equipment, enable IPv6 by doing 6to4 >>> tunnels, so what this press release says, is that there are many users who >>> are >>> already on IPv6 via Comcast network but not native? Providing relays close >>> to >>> them, is a good transition move. Alternatively, the measurement of this 6to4 >>> bandwidth on IPv4 may give you an idea of the demand for IPv6 from your >>> customers? May be you detected a non null number here? >>> >>> I'm just trying to understand more IPv6 by the examples. >>> >>> I'm personally using 6to4 at home, and experiencing some MTU issues, which >>> seems related to some PTB packets suppressed on the way between some end >>> points, and that can depend on which 6to4 relay I'm using. Still trying to >>> debug this (I'm not too fanatic about it, but work on it when I have a bit >>> of >>> time). I thought I would mention that. >>> The WAND people have done some good studies: >>> http://www.ripe.net/ripe/meetings/ripe-60/presentations/Stasiewicz-Measureme >>> nt >>> s_of_IPv6_Path_MTU_Discovery_Behaviour.pdf >>> >>> At the office, I have a more classical tunnel with he.net and do not have >>> any >>> issue there. >>> >>> ----- Original Message ----- >>> From: "John Jason Brzozowski" <john_brzozow...@cable.comcast.com> >>> To: "NANOG" <nanog@nanog.org> >>> Sent: Sunday, 29 August, 2010 5:49:30 AM >>> Subject: Comcast enables 6to4 relays >>> >>> FYI - thought this would be of interest to some of you, there will be more >>> news on this front shortly. >>> >>> http://www.comcast6.net/ >>> >>> 6to4 Relays Activated >>> Tuesday, August 17, 2010 >>> >>> 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. >>> >>> >>> >>> >> >> ========================================= >> John Jason Brzozowski >> Comcast Cable >> e) mailto:john_brzozow...@cable.comcast.com >> o) 609-377-6594 >> m) 484-962-0060 >> w) http://www.comcast6.net >> ========================================= >> >> > ========================================= John Jason Brzozowski Comcast Cable e) mailto:john_brzozow...@cable.comcast.com o) 609-377-6594 m) 484-962-0060 w) http://www.comcast6.net =========================================
