comcast business service

Jared Mauch jared at puck.nether.net
Thu Feb 20 15:27:37 UTC 2014


On Feb 20, 2014, at 4:08 AM, shawn wilson <ag4ve.us at gmail.com> wrote:

> A while ago I got Comcast's business service. Semi-idle connections
> are get dropped (I haven't really diagnosed this - I just no that it
> isn't the client or server but some network in between). However the
> second and most obvious issue is that intermittently, the service will
> grind to a halt:
> --- 8.8.8.8 ping statistics ---
> 37 packets transmitted, 34 received, 8% packet loss, time 36263ms
> rtt min/avg/max/mdev = 398.821/5989.160/14407.055/3808.068 ms, pipe 15
> 
> After a modem reboot, it goes normal:
> --- 8.8.8.8 ping statistics ---
> 4 packets transmitted, 4 received, 0% packet loss, time 3003ms
> rtt min/avg/max/mdev = 23.181/23.920/24.298/0.474 ms
> 
> This seems to happen about once or twice a day. I can't attribute it
> to any type of traffic or number of connections. All of the rest of
> the network equipment is the same and the behavior persists when a
> computer is plugged directly into the modem. I called Comcast and they
> said they didn't see anything even when I was experiencing ridiculous
> ping times. I tend to think it's an issue with the 'modem' but I'm not
> sure what the issue might be or how to reproduce it when asked to if I
> tell them to look at it.

Is this on their DOCSIS service?  I've seen the F connector on the back of the CM
introduce noise to the local segment and cause troubles.  If so, you need to have them
dispatch and swap the CM with one that doesn't have this issue.

- Jared




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