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.
On Feb 20, 2014, at 4:08 AM, shawn wilson <ag4ve.us@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
If it's one of their new Netgear-branded modems, see if you can get your tech to dig up an SMC. We had the same issue. They swapped out one Netgear modem for another Netgear and the problem continued. The phone techs couldn't see the problem and kept blaming our equipment. They finally sent out one of the 'senior' engineers I had worked with before on other jobs. He managed to get a hold of one of the SMCs from their warehouse. No more issues. -A On Thu, Feb 20, 2014 at 1:08 AM, shawn wilson <ag4ve.us@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.
Thanks. The tech said they looked at signal levels when I called and didn't see anything. I didn't have a baseline at the time (I do now) and assumed they'd see something there if there was something. I do have the Netgear. So I'll keep this in mind when I call them again (assuming it's really not a noise issue) though I'm not sure exactly what happened here or how I can get them to try the same thing? On Feb 20, 2014 3:11 PM, "Aaron C. de Bruyn" <aaron@heyaaron.com> wrote:
If it's one of their new Netgear-branded modems, see if you can get your tech to dig up an SMC.
We had the same issue. They swapped out one Netgear modem for another Netgear and the problem continued. The phone techs couldn't see the problem and kept blaming our equipment. They finally sent out one of the 'senior' engineers I had worked with before on other jobs. He managed to get a hold of one of the SMCs from their warehouse. No more issues.
-A
On Thu, Feb 20, 2014 at 1:08 AM, shawn wilson <ag4ve.us@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.
They often say everything looks okay. I can recall one conversation where the tech said he was talking to my modem and there were no problems all the way to it. I replied that it was unplugged in my hand because I had done so to read the serial number to him, so he couldn't be talking to it. Service did get better after that. :) -R> On Thu, Feb 20, 2014 at 12:35 PM, shawn wilson <ag4ve.us@gmail.com> wrote:
Thanks. The tech said they looked at signal levels when I called and didn't see anything. I didn't have a baseline at the time (I do now) and assumed they'd see something there if there was something.
I do have the Netgear. So I'll keep this in mind when I call them again (assuming it's really not a noise issue) though I'm not sure exactly what happened here or how I can get them to try the same thing? On Feb 20, 2014 3:11 PM, "Aaron C. de Bruyn" <aaron@heyaaron.com> wrote:
If it's one of their new Netgear-branded modems, see if you can get your tech to dig up an SMC.
We had the same issue. They swapped out one Netgear modem for another Netgear and the problem continued. The phone techs couldn't see the problem and kept blaming our equipment. They finally sent out one of the 'senior' engineers I had worked with before on other jobs. He managed to get a hold of one of the SMCs from their warehouse. No more issues.
-A
On Thu, Feb 20, 2014 at 1:08 AM, shawn wilson <ag4ve.us@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.
On Feb 20, 2014, at 4:08 AM, shawn wilson <ag4ve.us@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.
I’ve seen this happen before with various cable ISPs. I’d concur with the poster suggesting intermittent noise on the cable segment as a likely culprit. Also if you have a cable modem that binds multiple channels for higher bandwidth this can also be problematic, especially with the noise. Signals will look good to the NOC but it’s not the signal “level" that’s the issue it’s the signal to noise level. Noise has to be measured locally and techs don’t always check SNL. Also check to see if the packets aren’t actually being dropped but just taking longer than ping is looking for. Also check for out of sequence packets returned. These can indicate flapping of a bonded circuit or the bonded circuit experiencing noise. Try seeing if you disconnect everything and get a straight run to the demarc, with a know and tested out good cable, if the problem doesn’t ever occur. This could indicate noise on the cable in your premise. But I’ve experienced this same problem with noise coming through the demarc. I’ve also seen levels too hot beyond the demarc causing similar problems too. HTH. -d ----- Dan Shoop shoop@iwiring.net 1-646-402-5293 (GoogleVoice)
Works: Downstream Channel Downstream Frequency525000000 Hz561000000 Hz567000000 Hz573000000 Hz579000000 Hz Lock StatusLockedLockedLockedLockedLocked Modulation256 QAM256 QAM256 QAM256 QAM256 QAM Symbol Rate5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec Downstream Power 2.2 dBmV 3.8 dBmV 3.0 dBmV 2.9 dBmV 2.9 dBmV SNR41.2 dBmV40.8 dBmV40.5 dBmV40.9 dBmV41.0 dBmV Upstream Channel Upstream Frequency36000000 Hz29400000 Hz22800000 Hz0 Hz Lock StatusLockedLockedLockedNot Locked ModulationATDMAATDMAATDMAUnknown Symbol Rate5120 sym/sec5120 sym/sec5120 sym/sec0 sym/sec Upstream Power46.2 dBmV46.2 dBmV46.2 dBmV0 dBmV --- 8.8.8.8 ping statistics --- 10 packets transmitted, 10 received, 0% packet loss, time 9013ms rtt min/avg/max/mdev = 23.066/27.049/35.627/4.825 ms Not working: Downstream Channel Downstream Frequency525000000 Hz561000000 Hz567000000 Hz573000000 Hz579000000 Hz Lock StatusLockedLockedLockedLockedLocked Modulation256 QAM256 QAM256 QAM256 QAM256 QAM Symbol Rate5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec Downstream Power 2.2 dBmV 3.8 dBmV 2.9 dBmV 2.8 dBmV 2.9 dBmV SNR41.4 dBmV40.8 dBmV40.4 dBmV41.0 dBmV41.3 dBmV Upstream Channel Upstream Frequency36000000 Hz29400000 Hz22800000 Hz0 Hz Lock StatusLockedLockedLockedNot Locked ModulationATDMAATDMAATDMAUnknown Symbol Rate5120 sym/sec5120 sym/sec5120 sym/sec0 sym/sec Upstream Power46.5 dBmV46.5 dBmV46.5 dBmV0 dBmV --- 8.8.8.8 ping statistics --- 233 packets transmitted, 232 received, 0% packet loss, time 232884ms rtt min/avg/max/mdev = 23.431/1918.702/8758.161/2017.033 ms, pipe 9 I'm not seeing any big difference in SNR (and only slight differences in upstream power) and everything else seems to be the same. Though, since db is logarithmic, .3 might be enough to matter? On Thu, Feb 20, 2014 at 4:14 PM, Dan Shoop <shoop@iwiring.net> wrote:
On Feb 20, 2014, at 4:08 AM, shawn wilson <ag4ve.us@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.
I’ve seen this happen before with various cable ISPs. I’d concur with the poster suggesting intermittent noise on the cable segment as a likely culprit. Also if you have a cable modem that binds multiple channels for higher bandwidth this can also be problematic, especially with the noise. Signals will look good to the NOC but it’s not the signal “level" that’s the issue it’s the signal to noise level. Noise has to be measured locally and techs don’t always check SNL.
Also check to see if the packets aren’t actually being dropped but just taking longer than ping is looking for. Also check for out of sequence packets returned. These can indicate flapping of a bonded circuit or the bonded circuit experiencing noise. Try seeing if you disconnect everything and get a straight run to the demarc, with a know and tested out good cable, if the problem doesn’t ever occur. This could indicate noise on the cable in your premise. But I’ve experienced this same problem with noise coming through the demarc. I’ve also seen levels too hot beyond the demarc causing similar problems too.
HTH.
-d
-----
Dan Shoop shoop@iwiring.net 1-646-402-5293 (GoogleVoice)
Biggest unknown at this point is your upstream SNR. If there is noise ingress somewhere in the plant, then your upstream could be having all kinds of issues. Robert On Fri, 21 Feb 2014 05:23:07 -0500 shawn wilson <ag4ve.us@gmail.com> wrote:
Works:
Downstream Channel Downstream Frequency525000000 Hz561000000 Hz567000000 Hz573000000 Hz579000000 Hz Lock StatusLockedLockedLockedLockedLocked Modulation256 QAM256 QAM256 QAM256 QAM256 QAM Symbol Rate5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec Downstream Power 2.2 dBmV 3.8 dBmV 3.0 dBmV 2.9 dBmV 2.9 dBmV SNR41.2 dBmV40.8 dBmV40.5 dBmV40.9 dBmV41.0 dBmV Upstream Channel Upstream Frequency36000000 Hz29400000 Hz22800000 Hz0 Hz Lock StatusLockedLockedLockedNot Locked ModulationATDMAATDMAATDMAUnknown Symbol Rate5120 sym/sec5120 sym/sec5120 sym/sec0 sym/sec Upstream Power46.2 dBmV46.2 dBmV46.2 dBmV0 dBmV
--- 8.8.8.8 ping statistics --- 10 packets transmitted, 10 received, 0% packet loss, time 9013ms rtt min/avg/max/mdev = 23.066/27.049/35.627/4.825 ms
Not working:
Downstream Channel Downstream Frequency525000000 Hz561000000 Hz567000000 Hz573000000 Hz579000000 Hz Lock StatusLockedLockedLockedLockedLocked Modulation256 QAM256 QAM256 QAM256 QAM256 QAM Symbol Rate5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec5.360537 Msym/sec Downstream Power 2.2 dBmV 3.8 dBmV 2.9 dBmV 2.8 dBmV 2.9 dBmV SNR41.4 dBmV40.8 dBmV40.4 dBmV41.0 dBmV41.3 dBmV Upstream Channel Upstream Frequency36000000 Hz29400000 Hz22800000 Hz0 Hz Lock StatusLockedLockedLockedNot Locked ModulationATDMAATDMAATDMAUnknown Symbol Rate5120 sym/sec5120 sym/sec5120 sym/sec0 sym/sec Upstream Power46.5 dBmV46.5 dBmV46.5 dBmV0 dBmV
--- 8.8.8.8 ping statistics --- 233 packets transmitted, 232 received, 0% packet loss, time 232884ms rtt min/avg/max/mdev = 23.431/1918.702/8758.161/2017.033 ms, pipe 9
I'm not seeing any big difference in SNR (and only slight differences in upstream power) and everything else seems to be the same. Though, since db is logarithmic, .3 might be enough to matter?
On Thu, Feb 20, 2014 at 4:14 PM, Dan Shoop <shoop@iwiring.net> wrote:
On Feb 20, 2014, at 4:08 AM, shawn wilson <ag4ve.us@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.
I’ve seen this happen before with various cable ISPs. I’d concur with the poster suggesting intermittent noise on the cable segment as a likely culprit. Also if you have a cable modem that binds multiple channels for higher bandwidth this can also be problematic, especially with the noise. Signals will look good to the NOC but it’s not the signal “level" that’s the issue it’s the signal to noise level. Noise has to be measured locally and techs don’t always check SNL.
Also check to see if the packets aren’t actually being dropped but just taking longer than ping is looking for. Also check for out of sequence packets returned. These can indicate flapping of a bonded circuit or the bonded circuit experiencing noise. Try seeing if you disconnect everything and get a straight run to the demarc, with a know and tested out good cable, if the problem doesn’t ever occur. This could indicate noise on the cable in your premise. But I’ve experienced this same problem with noise coming through the demarc. I’ve also seen levels too hot beyond the demarc causing similar problems too.
HTH.
-d
-----
Dan Shoop shoop@iwiring.net 1-646-402-5293 (GoogleVoice)
On Fri, Feb 21, 2014 at 5:23 AM, shawn wilson <ag4ve.us@gmail.com> wrote:
I'm not seeing any big difference in SNR (and only slight differences in upstream power) and everything else seems to be the same. Though, since db is logarithmic, .3 might be enough to matter?
Do you also receive an _analog_ television signal from Comcast? How's the picture? Any ghosting, blurring or white noise? Any difference between working times and non-working times for your Internet service? Any difference if you connect directly to their entry cable without allowing it to touch the cable in your facility? Regards, Bill Herrin -- William D. Herrin ................ herrin@dirtside.com bill@herrin.us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004
participants (7)
-
Aaron C. de Bruyn -
Dan Shoop -
Jared Mauch -
Ray Wong -
rwebb＠ropeguru.com -
shawn wilson -
William Herrin