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[AZ] How many customer complaints does it take to »
« How do my signals look?  
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Goofball

join:2000-12-18
Avondale, AZ

reply to Dimp
Re: Bad Pings to a California Server (bad hops?)

Somebody found a problem somewhere in there and fixed it in the last few minutes. I've been messing around with tracking down an intermittent packet loss problem with my work VPN (Cox to AT&T via Level3) that's been going on for the last few days that sounds exactly like the original poster's issue. It wasn't high on my priority list as it wasn't a complete outage, it just made things a little "chunky" for most of the tools I use.

I was just getting ready to see if I could recreate the problem on the backup Cox business service cable modem we have at work between it and our primary AT&T internet service. I wanted to make sure the issues weren't with my local modem and node before I started calling support.

I'm pretty sure the problem was somewhere in the Cox network or Cox/Level3 peering as I have 8 other diverse ISP/Geographical sites connected via VPN over the same AT&T connection that had absolutely no issues. One of those sites is on Comcast business service cable modem that routes to AT&T via Comcast/Level3 peering with no issues.

In my testing at home if anyone cares: Smallish (up to 500 bytes) ICMP packets seemed to pass with only marginally bad 6% loss both inside and outside the VPN. Large (5000 bytes plus) ICMP packets were at about 20% loss outside the VPN and around 50% inside due to the nature of the connection and packet fragmentation.

I'd be interested to know what the problem was if anyone has any insight.

Goofball

join:2000-12-18
Avondale, AZ


edit:
May 10th, @12:42AM

Edit: Note, I am in the Phoenix area as well (Avondale).

I spoke too soon. I'm still seeing the loss, it's just very intermittent at the moment.

Looks like there is some route flap or a piece of iffy hardware messing with things somewhere along the way and causing retransmits. I'm watching my response times go from 60-70ms -> lost packet or two -> steady 300-400ms for a bit -> lost packet or two -> steady 60-70ms.

All testing so far is ICMP ping directly to fairly idle devices on the AT&T connection and to devices directly inside my work LAN via VPN that I know aren't configured to or busy enough to be de-prioritizing/dropping ICMP. The VPN eliminates any devices along the way that might be configured to drop ICMP as it encapsulates everything in IPSEC packets before sending.

I suppose I'll go eat some dinner, test to make sure it occurs on the office cable modem and then get Cox business support on the phone and see if they can get this annoyance fixed.

Traceroutes below if anyone cares.

Home Traceroute:

Traceroute from the Comcast - Located in Colorado Springs:
-
Forums » US Cable Support » Cox HSI[AZ] How many customer complaints does it take to »
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