11-19-2009 11:41 PM
For the past month or so I've been getting an increasing number of short disconnects. They are short enough that the modem lights seldom turn off but long enough to have my connections to programs dropped. Last week it became enough of an issue that a Comcast tech was out on Sunday. He replaced the modem but said everything else was fine. That didn't resolve the issue. In fact it's gotten worse.
The disconnects happen to all 4 computers in the house. They happen to my primary computer when I take the router out of the equation. Power cycling the modem doesn't stop the problem. I've inspected the coxial from the splitter to the modem and there are no obvious problems. I've replaced the ethernet lines between the modem and the router/my computer.
The following numbers are with my primary computer connected straight to the modem.
C:\Users\Home>tracert www.comcast.net
Tracing route to a1526.g.akamai.net [208.49.52.8]
over a maximum of 30 hops:
1 * * * Request timed out.
2 8 ms 10 ms 12 ms ge-2-3-ur01.wheatridge.co.denver.comcast.net
.86.105.129]
3 11 ms 13 ms 11 ms 68.86.179.133
4 10 ms 11 ms 11 ms te-0-8-0-1-ar02.denver.co.denver.comcast.net
.86.103.69]
5 11 ms 13 ms 13 ms 68.86.91.169
6 25 ms 26 ms 42 ms pos-0-2-0-0-cr01.santateresa.tx.ibone.comcas
t [68.86.86.170]
7 43 ms 42 ms 42 ms pos-1-8-0-0-cr01.losangeles.ca.ibone.comcast
[68.86.86.13]
8 55 ms 44 ms 42 ms TenGigabitEthernet9-1.ar2.LAX2.gblx.net [64.
88.29]
9 44 ms 44 ms 43 ms te2-3-10G.ar4.LAX1.gblx.net [67.17.107.42]
10 42 ms 44 ms 54 ms 208.49.52.8
Trace complete.
C:\Users\Home>tracert www.yahoo.com
Tracing route to www-real.wa1.b.yahoo.com [209.131.36.158]
over a maximum of 30 hops:
1 * * * Request timed out.
2 40 ms 12 ms 8 ms ge-2-3-ur01.wheatridge.co.denver.comcast.net
.86.105.129]
3 9 ms 33 ms 12 ms 68.86.179.133
4 9 ms 26 ms 26 ms te-0-8-0-1-ar02.denver.co.denver.comcast.net
.86.103.69]
5 23 ms 12 ms 10 ms 68.86.91.169
6 25 ms 24 ms 26 ms pos-0-3-0-0-cr01.santateresa.tx.ibone.comcas
t [68.86.86.174]
7 42 ms 42 ms 46 ms pos-1-7-0-0-cr01.losangeles.ca.ibone.comcast
[68.86.86.17]
8 * * * Request timed out.
9 44 ms 46 ms 56 ms if-14-0-0-1128.mcore5.LAA-LosAngeles.as6453.
[209.58.33.13]
10 58 ms 58 ms 70 ms if-5-0.mcore4.PDI-PaloAlto.as6453.net [216.6
9]
11 56 ms 56 ms 56 ms ix-11-0-3.mcore4.PDI-PaloAlto.as6453.net [20
.196.90]
12 57 ms 56 ms 99 ms ae1-p151.msr2.sp1.yahoo.com [216.115.107.79]
13 77 ms 72 ms 73 ms te-8-1.bas-a1.sp1.yahoo.com [209.131.32.17]
14 58 ms 60 ms 56 ms f1.www.vip.sp1.yahoo.com [209.131.36.158]
Trace complete.
C:\Users\Home>tracert www.google.com
Tracing route to www.l.google.com [74.125.53.103]
over a maximum of 30 hops:
1 * * * Request timed out.
2 31 ms 9 ms 11 ms ge-2-3-ur01.wheatridge.co.denver.comcast.net
.86.105.129]
3 35 ms 23 ms 11 ms 68.86.179.133
4 10 ms 9 ms 21 ms te-0-8-0-1-ar02.denver.co.denver.comcast.net
.86.103.69]
5 17 ms 10 ms 12 ms pos-0-4-0-0-cr01.denverqwest.co.ibone.comcas
t [68.86.91.17]
6 26 ms 25 ms 25 ms pos-0-3-0-0-cr01.santateresa.tx.ibone.comcas
t [68.86.86.174]
7 66 ms 43 ms 53 ms pos-1-8-0-0-cr01.losangeles.ca.ibone.comcast
[68.86.86.13]
8 60 ms 73 ms 54 ms pos-1-14-0-0-cr01.sanjose.ca.ibone.comcast.n
68.86.85.185]
9 63 ms 58 ms 55 ms pos-0-0-0-0-pe01.529bryant.ca.ibone.comcast.
[68.86.86.122]
10 64 ms 56 ms 101 ms 75.149.230.190
11 125 ms 67 ms 82 ms 216.239.49.168
12 56 ms 62 ms 55 ms 216.239.47.186
13 58 ms 62 ms 61 ms 216.239.48.32
14 60 ms 71 ms 69 ms 216.239.48.137
15 82 ms 68 ms 71 ms 72.14.232.10
16 59 ms 65 ms 57 ms pw-in-f103.1e100.net [74.125.53.103]
Trace complete.
C:\Users\Home>ping -t www.comcast.net
Pinging a1526.g.akamai.net [8.14.216.17] with 32 bytes of data:
Reply from 8.14.216.17: bytes=32 time=46ms TTL=56
Reply from 8.14.216.17: bytes=32 time=39ms TTL=56
Reply from 8.14.216.17: bytes=32 time=53ms TTL=56
Reply from 8.14.216.17: bytes=32 time=39ms TTL=56
Reply from 8.14.216.17: bytes=32 time=58ms TTL=56
Reply from 8.14.216.17: bytes=32 time=39ms TTL=56
Reply from 8.14.216.17: bytes=32 time=42ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=41ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=45ms TTL=56
Reply from 8.14.216.17: bytes=32 time=62ms TTL=56
Reply from 8.14.216.17: bytes=32 time=41ms TTL=56
Reply from 8.14.216.17: bytes=32 time=51ms TTL=56
Reply from 8.14.216.17: bytes=32 time=61ms TTL=56
Reply from 8.14.216.17: bytes=32 time=44ms TTL=56
Reply from 8.14.216.17: bytes=32 time=49ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=74ms TTL=56
Reply from 8.14.216.17: bytes=32 time=52ms TTL=56
Reply from 8.14.216.17: bytes=32 time=39ms TTL=56
Reply from 8.14.216.17: bytes=32 time=46ms TTL=56
Reply from 8.14.216.17: bytes=32 time=39ms TTL=56
Reply from 8.14.216.17: bytes=32 time=42ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=51ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=54ms TTL=56
Reply from 8.14.216.17: bytes=32 time=55ms TTL=56
Reply from 8.14.216.17: bytes=32 time=36ms TTL=56
Reply from 8.14.216.17: bytes=32 time=59ms TTL=56
Reply from 8.14.216.17: bytes=32 time=48ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=54ms TTL=56
Reply from 8.14.216.17: bytes=32 time=52ms TTL=56
Reply from 8.14.216.17: bytes=32 time=43ms TTL=56
Reply from 8.14.216.17: bytes=32 time=56ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=36ms TTL=56
Reply from 8.14.216.17: bytes=32 time=44ms TTL=56
Reply from 8.14.216.17: bytes=32 time=43ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=39ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=40ms TTL=56
Reply from 8.14.216.17: bytes=32 time=39ms TTL=56
Reply from 8.14.216.17: bytes=32 time=39ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=48ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=41ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=39ms TTL=56
Reply from 8.14.216.17: bytes=32 time=43ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=39ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=48ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=39ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=39ms TTL=56
Reply from 8.14.216.17: bytes=32 time=36ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=38ms TTL=56
Reply from 8.14.216.17: bytes=32 time=37ms TTL=56
Reply from 8.14.216.17: bytes=32 time=55ms TTL=56
Reply from 8.14.216.17: bytes=32 time=44ms TTL=56
Ping statistics for 8.14.216.17:
Packets: Sent = 76, Received = 76, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 36ms, Maximum = 74ms, Average = 43ms
For modem signal stats I have the following..
Down Stream Power Level: 1 dBmV
Down Stream Signal to Noise Ratio: 34 dB
Upstream Power Level: 50 dBmV
Does anyone have any ideas?
Thanks
11-20-2009 09:21 AM
Welcome to the Forum. Sorry you are having trouble.
Looks like you have done a pretty thorough job of troubleshooting your issue.
The only thing I see from the data you posted is that the upstream power is on the high edge. It might be bouncing up and out of spec.
Would you please copy and ppaste the Log from this new modem back here in your thread.
11-20-2009 01:42 PM
Seeing the same issue here on this side of town, Castle Pines North.. I have a program ping plotter that is set up to ping comcast.com and log issues.. Even with the documentation , I get the same story as you from Comcast (hear no evil see no evil.. I have had some lip service from a feedback to comcast link where you send corportate an email. Your trace looks cleaner then mine with some unexplained hops in mine.
This makes VOIP no a viable option if you get intermittant drops.
11/19/2009 3:03:06 PM,3053,3016, * ,N/A ,N/A ,N/A ,N/A ,N/A ,2792,2754,2714,2676,2634
Trace Session Started at: 11/17/2009 8:14:36 PM
Trace to: comcast.com 68.87.60.144
Repeated every 2.5 seconds
Hop IPAddress DNSName
2 68.85.221.221 te-8-2-ur01.englewood.co.denver.comcast.net
3 68.86.179.166 --------------
4 68.86.103.45 te-0-0-0-4-ar02.aurora.co.denver.comcast.net
5 -
6 -
7 -
8 -
9 -
10 68.86.72.162 te-4-2-ar01.newcastle.de.bo.comcast.net
11 68.86.228.102 te-1-1-ar02.ndceast.pa.bo.comcast.net
12 68.86.134.49 te-4-1-ur02.ndceast.pa.bo.comcast.net
13 68.87.98.12 --------------
14 68.87.60.144 eloa.comcast.com
Date/Time 2 3 4 5 6 7 8 9 10 11 12 13 14
11/20/2009 6:49:04 AM,9 ,12 , * ,N/A ,N/A ,N/A ,N/A ,N/A ,68 ,70 ,70 ,73 , *
Trace Session Started at: 11/17/2009 8:14:36 PM
Trace to: comcast.com 68.87.60.144
Repeated every 2.5 seconds
Hop IPAddress DNSName
2 68.85.221.221 te-8-2-ur01.englewood.co.denver.comcast.net
3 68.86.179.166 --------------
4 68.86.103.45 te-0-0-0-4-ar02.aurora.co.denver.comcast.net
5 -
6 -
7 -
8 -
9 -
10 68.86.72.162 te-4-2-ar01.newcastle.de.bo.comcast.net
11 68.86.228.102 te-1-1-ar02.ndceast.pa.bo.comcast.net
12 68.86.134.49 te-4-1-ur02.ndceast.pa.bo.comcast.net
13 68.87.98.12 --------------
14 68.87.60.144 eloa.comcast.com
Date/Time 2 3 4 5 6 7 8 9 10 11 12 13 14
11/20/2009 6:49:04 AM,9 ,12 , * ,N/A ,N/A ,N/A ,N/A ,N/A ,68 ,70 ,70 ,73 , *
11/20/2009 7:33:04 AM,10 ,11 , * ,N/A ,N/A ,N/A ,N/A ,N/A ,71 ,71 ,73 , * ,1490
11/20/2009 7:33:04 AM,10 ,11 , * ,N/A ,N/A ,N/A ,N/A ,N/A ,71 ,71 ,73 , * ,1490
11/20/2009 10:09:04 AM,11 ,12 , * ,N/A ,N/A ,N/A ,N/A ,N/A ,69 ,71 ,72 , * ,2617
11/20/2009 10:09:04 AM,11 ,12 , * ,N/A ,N/A ,N/A ,N/A ,N/A ,69 ,71 ,72 , * ,2617
11-20-2009 01:48 PM
11-20-2009 02:20 PM - edited 11-20-2009 02:21 PM
What do random traces to other sites look like ?
Try using www.google.com instead of the Comcast site.
And if you are using a flavor of Windows. Please use the built in tracert tool.
11-20-2009 03:31 PM
Thanks for the reply JMCS. Here's the log from the modem.
| 2009-11-20 07:51:45 | 3-Critical | R02.0 | No Ranging Response received - T3 time-out |
| 2009-11-19 22:38:53 | 7-Information | SNMP: Working in SNMP V1/2c Only NmAccess mode | |
| 2009-11-19 22:38:51 | 7-Information | INITIALIZATION COMPLETE - MODEM IS OPERATIONAL | |
| 2009-11-19 22:38:51 | 7-Information | PROG: SW Download File name the same as currently run. | |
| 2009-11-19 22:38:51 | 7-Information | SEC: Co-Signer CVC from configuration file was verified | |
| 2009-11-19 22:38:50 | 7-Information | B401.0 | Authorized |
| 2009-11-19 22:38:50 | 7-Information | REGISTRATION COMPLETE - Waiting for Operational status | |
| 2009-11-19 22:38:50 | 7-Information | Registration file - downloaded | |
| 2009-11-19 22:38:48 | 7-Information | Trying to download Configuration file ... | |
| 2009-11-19 22:38:48 | 7-Information | Time of day - retrieved | |
| 1970-01-01 00:00:14 | 7-Information | DHCP - parameters acquired | |
| 1970-01-01 00:00:14 | 7-Information | DHCP: ACK: Setting (*) CM TFTP Boot file: d11_m_sb5120_silver_c01.cm | |
| 1970-01-01 00:00:14 | 7-Information | DHCP: Setting CM IP address to: 73.85.15.125 | |
| 1970-01-01 00:00:14 | 7-Information | DHCP: Setting (*) CM Syslog Server address to: 0.0.0.0 | |
| 1970-01-01 00:00:14 | 7-Information | DHCP: Setting (*) CM Time Server address to: 68.87.66.15 | |
| 1970-01-01 00:00:14 | 7-Information | DHCP: Setting (*) CM Subnet mask to: 255.255.240.0 | |
| 1970-01-01 00:00:14 | 7-Information | DHCP: Setting (*) CM Gateway address to: 73.85.0.1 | |
| 1970-01-01 00:00:14 | 7-Information | DHCP: OFFER: Setting (*) CM TFTP Boot file: d11_m_sb5120_silver_c01.cm | |
| 1970-01-01 00:00:14 | 7-Information | DHCP select: Setting (*) CM TFTP Server address to: 68.87.66.15 | |
| 1970-01-01 00:00:14 | 7-Information | DHCP: Offered (*) CM IP address to: 73.85.15.125 |
11-23-2009 04:04 PM
I'm in the same area (Westminster) and have been seeing the same behavior. It has gotten worse in the past week.
When I lose connection I'm noticing packet loss to my Comcast gateway as well as random high echo responses.
I understand some packet loss can be expected on a network but it shouldn't be occuring to the subnet gateway (first hop).
<snip>
64 bytes from 98.245.0.1: icmp_seq=93 ttl=255 time=7.1 ms
64 bytes from 98.245.0.1: icmp_seq=94 ttl=255 time=8.1 ms
64 bytes from 98.245.0.1: icmp_seq=95 ttl=255 time=9.1 ms
64 bytes from 98.245.0.1: icmp_seq=96 ttl=255 time=9.5 ms
64 bytes from 98.245.0.1: icmp_seq=97 ttl=255 time=8.0 ms
64 bytes from 98.245.0.1: icmp_seq=98 ttl=255 time=8.9 ms
64 bytes from 98.245.0.1: icmp_seq=105 ttl=255 time=1346.8 ms
64 bytes from 98.245.0.1: icmp_seq=106 ttl=255 time=347.1 ms
64 bytes from 98.245.0.1: icmp_seq=107 ttl=255 time=9.0 ms
64 bytes from 98.245.0.1: icmp_seq=108 ttl=255 time=7.5 ms
64 bytes from 98.245.0.1: icmp_seq=109 ttl=255 time=8.5 ms
64 bytes from 98.245.0.1: icmp_seq=110 ttl=255 time=6.9 ms
64 bytes from 98.245.0.1: icmp_seq=111 ttl=255 time=7.9 ms
</snip>
I have reset the modem numerous times with no change.
| Time | Priority | Code | Message |
|---|---|---|---|
| 2009-11-23 13:44:17 | 3-Critical | R02.0 | No Ranging Response received - T3 time-out |
| 2009-11-23 13:25:30 | 7-Information | SNMP: Working in SNMP V1/2c Only NmAccess mode | |
| 2009-11-23 13:25:28 | 7-Information | INITIALIZATION COMPLETE - MODEM IS OPERATIONAL | |
| 2009-11-23 13:25:28 | 7-Information | PROG: SW Download File name the same as currently run. | |
| 2009-11-23 13:25:28 | 7-Information | SEC: Co-Signer CVC from configuration file was verified | |
| 2009-11-23 13:25:26 | 7-Information | B401.0 | Authorized |
| 2009-11-23 13:25:26 | 7-Information | REGISTRATION COMPLETE - Waiting for Operational status | |
| 2009-11-23 13:25:26 | 7-Information | Registration file - downloaded | |
| 2009-11-23 13:25:24 | 7-Information | Trying to download Configuration file ... | |
| 2009-11-23 13:25:24 | 7-Information | Time of day - retrieved | |
| 1970-01-01 00:00:18 | 7-Information | DHCP - parameters acquired | |
| 1970-01-01 00:00:18 | 7-Information | DHCP: ACK: Setting (*) CM TFTP Boot file: d11_m_sb5120_speedtier_c01.cm | |
| 1970-01-01 00:00:18 | 7-Information | DHCP: Setting CM IP address to: 96.169.31.28 | |
| 1970-01-01 00:00:18 | 7-Information | DHCP: Setting (*) CM Syslog Server address to: 0.0.0.0 | |
| 1970-01-01 00:00:18 | 7-Information | DHCP: Setting (*) CM Time Server address to: 68.87.66.14 | |
| 1970-01-01 00:00:18 | 7-Information | DHCP: Setting (*) CM Subnet mask to: 255.255.248.0 | |
| 1970-01-01 00:00:18 | 7-Information | DHCP: Setting (*) CM Gateway address to: 96.169.24.1 | |
| 1970-01-01 00:00:18 | 7-Information | DHCP: OFFER: Setting (*) CM TFTP Boot file: d11_m_sb5120_speedtier_c01.cm | |
| 1970-01-01 00:00:18 | 7-Information | DHCP select: Setting (*) CM TFTP Server address to: 68.87.66.14 | |
| 1970-01-01 00:00:18 | 7-Information | DHCP: Offered (*) CM IP address to: 96.169.31.28 |
Signals:
| Downstream | Value | |
|---|---|---|
| Frequency | 603000000 Hz | |
| Signal to Noise Ratio | 33 dB | |
| QAM | QAM256 | |
| Network Access Control Object | ON | |
| Power Level | 6 dBmV
|
| Upstream | Value |
|---|---|
| Channel ID | 12 |
| Frequency | 35800000 Hz |
| Ranging Service ID | 2518 |
| Symbol Rate | 5.120 Msym/s |
| Power Level | 34 dBmV |
11-23-2009 04:09 PM
Just after posting the last post I had the disconnect again and did a ping to the gateway..
~ # ping 98.245.0.1
PING 98.245.0.1 (98.245.0.1): 56 data bytes
64 bytes from 98.245.0.1: icmp_seq=5 ttl=255 time=24.6 ms
64 bytes from 98.245.0.1: icmp_seq=6 ttl=255 time=8.0 ms
64 bytes from 98.245.0.1: icmp_seq=7 ttl=255 time=8.9 ms
64 bytes from 98.245.0.1: icmp_seq=8 ttl=255 time=7.8 ms
64 bytes from 98.245.0.1: icmp_seq=9 ttl=255 time=8.4 ms
64 bytes from 98.245.0.1: icmp_seq=10 ttl=255 time=9.3 ms
64 bytes from 98.245.0.1: icmp_seq=13 ttl=255 time=9.2 ms
64 bytes from 98.245.0.1: icmp_seq=26 ttl=255 time=7.7 ms
64 bytes from 98.245.0.1: icmp_seq=27 ttl=255 time=8.7 ms
64 bytes from 98.245.0.1: icmp_seq=28 ttl=255 time=194.4 ms
64 bytes from 98.245.0.1: icmp_seq=29 ttl=255 time=7.6 ms
64 bytes from 98.245.0.1: icmp_seq=30 ttl=255 time=9.1 ms
64 bytes from 98.245.0.1: icmp_seq=43 ttl=255 time=7.2 ms
64 bytes from 98.245.0.1: icmp_seq=44 ttl=255 time=8.1 ms
--- 98.245.0.1 ping statistics ---
45 packets transmitted, 14 packets received, 68% packet loss
round-trip min/avg/max = 7.2/22.7/194.4 ms
I'll look at getting the modem replaced.. again. Though it seems that there may be something in a larger area going on.
11-23-2009 05:04 PM
I saw this thread http://forums.comcast.net/comcastsupport/board/mes
I have the same modem and firmware.
Software Version: SB5120-2.19.0.14-SCM01-NOSH
Hardware Version: 4
MIB Version: II
GUI Version: 1.0
VxWorks Version: 5.4
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