Cogent Router dropping packets
Hi, Some of our VoIP customers are experiencing issues using our service and it only happens when routing through Cogent. Does anyone have a contact for them? Thanks Host Loss% Snt Last Avg Best Wrst StDev 1. adsl-63-194-xxx-xxx.dsl.lsan03.pacbell.net 0.0% 6049 13.7 24.2 8.4 72.2 11.1 2. dist3-vlan60.irvnca.sbcglobal.net 2.0% 6049 19.0 23.5 8.6 217.4 13.5 3. bb1-p6-7.emhril.ameritech.net 0.0% 6049 31.7 43.0 8.6 317.3 46.4 4. ex2-p14-0.eqlaca.sbcglobal.net 0.0% 6049 19.8 44.3 9.4 487.8 49.5 5. te8-1.mpd01.lax05.atlas.cogentco.com 0.0% 6049 15.0 41.1 9.5 675.9 53.4 6. vl3491.ccr02.lax01.atlas.cogentco.com 3.3% 6049 34.3 29.4 9.9 337.5 25.4 7. te3-4.ccr01.lax04.atlas.cogentco.com 5.2% 6049 19.3 30.1 10.4 275.1 23.6 8. vl3805.na21.b002695-2.lax04.atlas.cogentco.com 5.1% 6049 35.0 27.7 10.2 227.3 12.2 9. PAETEC_Communications_Inc.demarc.cogentco.com 5.3% 6049 18.3 35.8 9.8 252.4 33.6 10. gi-4-0-1-3.core01.lsajca01.paetec.net 5.5% 6049 17.3 37.9 13.3 1054. 43.5 11. po-5-0-0.core01.anhmca01.paetec.net 5.5% 6049 30.7 37.5 13.7 1042. 37.9 12. gi-3-0-0.edge03.anhmca01.paetec.net 5.3% 6049 19.7 33.3 12.9 385.1 20.7 13. 74.10.xxx.xxx 5.9% 6049 23.8 35.8 18.1 86.5 11.8 14. 74.10.xxx.xxx 5.2% 6049 40.4 36.4 18.0 91.1 11.8
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Just spoke to cogent about another issue, said they only know about issues in Los Angeles. Nevertheless, 877.726.4386 or support@cogentco.com /Ryan Mike Fedyk wrote:
Hi,
Some of our VoIP customers are experiencing issues using our service and it only happens when routing through Cogent.
Does anyone have a contact for them?
Thanks
Host Loss% Snt Last Avg Best Wrst StDev 1. adsl-63-194-xxx-xxx.dsl.lsan03.pacbell.net 0.0% 6049 13.7 24.2 8.4 72.2 11.1 2. dist3-vlan60.irvnca.sbcglobal.net 2.0% 6049 19.0 23.5 8.6 217.4 13.5 3. bb1-p6-7.emhril.ameritech.net 0.0% 6049 31.7 43.0 8.6 317.3 46.4 4. ex2-p14-0.eqlaca.sbcglobal.net 0.0% 6049 19.8 44.3 9.4 487.8 49.5 5. te8-1.mpd01.lax05.atlas.cogentco.com 0.0% 6049 15.0 41.1 9.5 675.9 53.4 6. vl3491.ccr02.lax01.atlas.cogentco.com 3.3% 6049 34.3 29.4 9.9 337.5 25.4 7. te3-4.ccr01.lax04.atlas.cogentco.com 5.2% 6049 19.3 30.1 10.4 275.1 23.6 8. vl3805.na21.b002695-2.lax04.atlas.cogentco.com 5.1% 6049 35.0 27.7 10.2 227.3 12.2 9. PAETEC_Communications_Inc.demarc.cogentco.com 5.3% 6049 18.3 35.8 9.8 252.4 33.6 10. gi-4-0-1-3.core01.lsajca01.paetec.net 5.5% 6049 17.3 37.9 13.3 1054. 43.5 11. po-5-0-0.core01.anhmca01.paetec.net 5.5% 6049 30.7 37.5 13.7 1042. 37.9 12. gi-3-0-0.edge03.anhmca01.paetec.net 5.3% 6049 19.7 33.3 12.9 385.1 20.7 13. 74.10.xxx.xxx 5.9% 6049 23.8 35.8 18.1 86.5 11.8 14. 74.10.xxx.xxx 5.2% 6049 40.4 36.4 18.0 91.1 11.8
- -- Ryan M. Harden, BS, KC9IHX Office: 217-265-5192 CITES - Network Engineering Cell: 630-363-0365 2130 Digital Computer Lab Fax: 217-244-7089 1304 W. Springfield email: hardenrm@uiuc.edu Urbana, IL 61801 University of Illinois at Urbana/Champaign University of Illinois - ICCN -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) iD8DBQFIB7SKtuPckBBbXboRApkwAJ90YSs6Fdy0JmaLXvNGT3U0xJ3hyQCeP+Hh GiwjrfIDwWUtC52aS2h+kDc= =Vxm1 -----END PGP SIGNATURE-----
Thank you, the issue seems to be fixed now at Cogent. Does anyone know how often issues like this seem to crop up? I'm wondering to see how hard I should push here for routing around cogent for networks our customers connect from. Mike -----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of Ryan Harden Sent: Thursday, April 17, 2008 1:35 PM To: Mike Fedyk Cc: nanog@merit.edu Subject: Re: Cogent Router dropping packets -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Just spoke to cogent about another issue, said they only know about issues in Los Angeles. Nevertheless, 877.726.4386 or support@cogentco.com /Ryan Mike Fedyk wrote:
Hi,
Some of our VoIP customers are experiencing issues using our service and it only happens when routing through Cogent.
Does anyone have a contact for them?
Thanks
Host Loss% Snt Last Avg Best Wrst StDev 1. adsl-63-194-xxx-xxx.dsl.lsan03.pacbell.net 0.0% 6049 13.7 24.2 8.4 72.2 11.1 2. dist3-vlan60.irvnca.sbcglobal.net 2.0% 6049 19.0 23.5 8.6 217.4 13.5 3. bb1-p6-7.emhril.ameritech.net 0.0% 6049 31.7 43.0 8.6 317.3 46.4 4. ex2-p14-0.eqlaca.sbcglobal.net 0.0% 6049 19.8 44.3 9.4 487.8 49.5 5. te8-1.mpd01.lax05.atlas.cogentco.com 0.0% 6049 15.0 41.1 9.5 675.9 53.4 6. vl3491.ccr02.lax01.atlas.cogentco.com 3.3% 6049 34.3 29.4 9.9 337.5 25.4 7. te3-4.ccr01.lax04.atlas.cogentco.com 5.2% 6049 19.3 30.1 10.4 275.1 23.6 8. vl3805.na21.b002695-2.lax04.atlas.cogentco.com 5.1% 6049 35.0 27.7 10.2 227.3 12.2 9. PAETEC_Communications_Inc.demarc.cogentco.com 5.3% 6049 18.3 35.8 9.8 252.4 33.6 10. gi-4-0-1-3.core01.lsajca01.paetec.net 5.5% 6049 17.3 37.9 13.3 1054. 43.5 11. po-5-0-0.core01.anhmca01.paetec.net 5.5% 6049 30.7 37.5 13.7 1042. 37.9 12. gi-3-0-0.edge03.anhmca01.paetec.net 5.3% 6049 19.7 33.3 12.9 385.1 20.7 13. 74.10.xxx.xxx 5.9% 6049 23.8 35.8 18.1 86.5 11.8 14. 74.10.xxx.xxx 5.2% 6049 40.4 36.4 18.0 91.1 11.8
- -- Ryan M. Harden, BS, KC9IHX Office: 217-265-5192 CITES - Network Engineering Cell: 630-363-0365 2130 Digital Computer Lab Fax: 217-244-7089 1304 W. Springfield email: hardenrm@uiuc.edu Urbana, IL 61801 University of Illinois at Urbana/Champaign University of Illinois - ICCN -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) iD8DBQFIB7SKtuPckBBbXboRApkwAJ90YSs6Fdy0JmaLXvNGT3U0xJ3hyQCeP+Hh GiwjrfIDwWUtC52aS2h+kDc= =Vxm1 -----END PGP SIGNATURE-----
Cogent frequently have routing and packet loss issues. I can't imagine VoIP over their network is all that appealing to most people. Last time I used Cogent I had a problem approx. every month, and I purchased transit from them. Good luck :-) Mike Fedyk wrote:
Thank you, the issue seems to be fixed now at Cogent.
Does anyone know how often issues like this seem to crop up? I'm wondering to see how hard I should push here for routing around cogent for networks our customers connect from.
Same here... frequent packet loss. We had Cogent GigE service for about 9 months if I recall - more than one major outage per month and packet loss issues at least once a week. You get what you pay for (within reason).... --- Paul Stewart Senior Network Administrator Nexicom 5 King St. E., Millbrook, ON, LOA 1GO Phone: 705-932-4127 Web: http://www.nexicom.net Nexicom. Connected. Naturally. -----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of David Coulson Sent: Thursday, April 17, 2008 8:00 PM To: Mike Fedyk Cc: 'Ryan Harden'; nanog@merit.edu Subject: Re: Cogent Router dropping packets Cogent frequently have routing and packet loss issues. I can't imagine VoIP over their network is all that appealing to most people. Last time I used Cogent I had a problem approx. every month, and I purchased transit from them. Good luck :-) Mike Fedyk wrote:
Thank you, the issue seems to be fixed now at Cogent.
Does anyone know how often issues like this seem to crop up? I'm wondering to see how hard I should push here for routing around cogent for networks our customers connect from.
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Same here... frequent packet loss. We had Cogent GigE service for about 9 months if I recall - more than one major outage per month and packet loss issues at least once a week.
You get what you pay for (within reason)....
From a service provider's point of view, in many places in the country,
Cogent tends towards being a content network, and has occasional peering issues with other networks who wind up bearing some of the related costs. Internally, their network earns better than average marks, but sometimes there will be strange things that don't seem to make sense, and these may or may not be explained or fixed if you contact Cogent. Externally, we've seen their history of peering problems. We've noticed that there tend to be specific routes where Cogent experiences problems for long periods of time. In the last few years, for example, if packets went through Paris or London to destination ISP's in the associated countries, there tended to be some performance problems. Some of these have cleared up. It would appear to be peering and/or congestion issues. These would typically only affect specific destinations, but often required analysis and workarounds to be implemented. We've not noticed problems with major outages, but that may be because of our location (Ashburn). There seem to be some people who do not experience outages, and others who experience frequent outages. This may be dependent on where in the Cogent network you are. In their original business model, providing business ethernet connections in a metro area, they're a very attractive provider, but I'd guess their overall reliability would feel to be on par with some commercial ISP's, due to occasional peering problems, packet loss, etc. their service is still sufficiently cheap that it could be worth considering as part of a bandwidth mix. Given the availability of automated tools to manage connections susceptible to brownouts (Cisco OER, Avaya/RouteScience, etc), it may be quite attractive and viable to use Cogent in certain environments, but you have to give it some thought. To the original poster, Cogent to AT&T (DSL, etc) has historically been what I'd consider to be "problematic." For years. Filtering out routes that involve both AT&T and Cogent seems to work, though it may be unnecessarily aggressive (and obviously you'd need an alternate carrier with good connectivity to AT&T). ... JG -- Joe Greco - sol.net Network Services - Milwaukee, WI - http://www.sol.net "We call it the 'one bite at the apple' rule. Give me one chance [and] then I won't contact you again." - Direct Marketing Ass'n position on e-mail spam(CNN) With 24 million small businesses in the US alone, that's way too many apples. _______________________________________________ NANOG mailing list NANOG@nanog.org http://mailman.nanog.org/mailman/listinfo/nanog
participants (5)
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David Coulson -
Joe Greco -
Mike Fedyk -
Paul Stewart -
Ryan Harden