I compare IPv6 latencies and especially asymmetric latencies today with what I was observing for edge users on IPv4 maybe 15 years ago, with some providers sending all users nationwide through a single node in Mae-East for example.
I suspect that for IPv6 the problem is often tromboning. The systematic asymmetry in Tom's example graph means something less than optimal is going on for sure, never mind the big gaps. I wonder if one direction is tromboning but the other isn't. I've been waiting for the economics of scale to force good IPv6 configurations but outside the IPv6-hip core it hasn't happened yet. ________________________________________ From: [email protected] [[email protected]] On Behalf Of Nathan Gibbs [[email protected]] Sent: Sunday, October 09, 2011 8:24 AM To: [email protected] Subject: Re: [Pool] IPv6 server constantly dropping off the pool On 10/8/2011 7:01 PM, Tom Hek wrote: > Hello, > > My IPv6 NTP server constantly drops out of the pool because the > monitoring server can't reach it. The server is perfectly reachable > and from what I see the offset is not as dramatic as the NTP pool > monitoring thinks. > > I think the peering between my ISP, Leaseweb, and the monitoring > system is really bad, because I get every one or two times a month a > mail my NTP service is unreachable while it's perfectly available. > Anyone else having this problem? This is my system: > http://www.pool.ntp.org/scores/2001:1af8:4400:a00e:1::1 The graphs > look horrible, but from my own probes to this system from another v6 > host on another network everything looks fine, even when I'm > "unreachable" according to the pool monitoring service. > Those graphs are what the pool monitor sees. It really doesn't care what anyone else sees. For instance, our NTP service is running fine, however one of our users fired up bit torrent the other day, which has done some bad things to our graph. http://www.pool.ntp.org/scores/66.152.120.26 However, its not the pool's problem, its ours, and the graphs are what they are. Sincerely, Nathan Gibbs Systems Administrator Christ Media http://www.cmpublishers.com _______________________________________________ pool mailing list [email protected] http://lists.ntp.org/listinfo/pool
