Otis et al, I believe Carlos ruled out ICMP prio as a result of doing a native server-to-server ping, from 208.86.121.129 to 66.62.162.31, as indicated here:
--- 66.62.162.31 ping statistics --- 62 packets transmitted, 40 received, 35% packet loss, time 61016ms rtt min/avg/max/mdev = 53.803/57.115/62.127/1.730 ms
ICMP prio doesn't affect src-to-dst RTT or packet loss; it affects src-to-administrative-router-IP situations (individual hop probes in traceroute, sans the destination, etc.). I think it's more likely that there is a saturated network link somewhere, given the behaviour shown. Seeing the return path (not for latency or packet loss reasons, but to see the peering points) would be useful though. -- | Jeremy Chadwick jdc@koitsu.org | | UNIX Systems Administrator http://jdc.koitsu.org/ | | Mountain View, CA, US | | Making life hard for others since 1977. PGP 4BD6C0CB | On Wed, Oct 10, 2012 at 09:43:15PM -0500, Otis L. Surratt, Jr. wrote:
Just a thought have you both ruled out ICMP priortization? Cogent does this... Also, have you called or just submitted a ticket?
Everytime, I've opened a ticket....I've gotten a response rather quickly and for sure when I call.
-----Original Message----- From: outages-bounces@outages.org [mailto:outages-bounces@outages.org] On Behalf Of Brent Jones Sent: Wednesday, October 10, 2012 9:10 PM To: Carlos Alvarez Cc: outages@outages.org Subject: Re: [outages] Cogent packet loss and jitter
I take it back, still seeing high latency, and very poor transfer performance :(
38.122.252.185 to 154.54.0.89 (BOS to PDX, Cogent on-net POPs), spiking to 150ms latency.
On Wed, Oct 10, 2012 at 6:30 PM, Carlos Alvarez <carlos@televolve.com> wrote:
On Wed, Oct 10, 2012 at 6:23 PM, Brent Jones <brent@brentrjones.com> wrote:
(even to other Cogent on-net POPs)
This right here is frustrating, since they are in the same city and same network:
5 vl3810.mag02.phx02.atlas.cogentco.com (66.28.64.209) 12.983 ms 12.979 ms 12.964 ms 6 * te7-4.ccr01.phx02.atlas.cogentco.com (154.54.85.85) 195.832 ms *
As you might imagine, we have a lot of complaints.
-- Carlos Alvarez TelEvolve 602-889-3003
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-- Brent Jones brent@brentrjones.com _______________________________________________ Outages mailing list Outages@outages.org https://puck.nether.net/mailman/listinfo/outages
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