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kschrink
Posts: 1
Registered: ‎11-01-2011

DHCP WARNING - Non-critical field invalid in response ;CM-MAC...

I have been having problems with intermittent internet connectivity for months.  Sometimes I will go days without an outage, and sometimes only hours between outages.  The problems started back in June and it seems to be getting worse as the temperatures drop.  It is now happening 3 or 4 times a week.  It may be just a coincidence, but it started happening about the same time as the DOCSIS upgrade.

 

I own my own modem.  It is a Zoom 5350.  I purchased this modem back in June after I started having problems.  Unfortunately, the problems continued after the purchase.  This modem was listed on Comcasts web site as being acceptable.

 

I finally had a tech come out a couple of weeks ago.  He switched the coax lines around on my splitter and announced the problem was fixed.  He ran diagnostics on his portable machine and everything looked fine when he left.  My service was great for a few days and then the outages started again.

 

Here is what I have been looking at this morning on my event log.

 

SNMP Event Log

This page displays the contents of the SNMP event log.

 Time   Priority   Description   Tue Nov 01 11:01:37 2011    Critical (3)   Started Unicast Maintenance Ranging - No Response received - ...   Time Not Established   Warning (5)   DHCP WARNING - Non-critical field invalid in response ;CM-MAC...   Time Not Established   Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:50:bf:ce...   Tue Nov 01 09:19:19 2011    Critical (3)   Unicast Ranging Received Abort Response - Re-initializing MAC...   Tue Nov 01 09:13:18 2011    Critical (3)   Started Unicast Maintenance Ranging - No Response received - ...   Tue Nov 01 04:16:07 2011    Critical (3)   Started Unicast Maintenance Ranging - No Response received - ...   Sat Oct 29 02:09:07 2011    Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:50:bf:ce...   Sat Oct 29 02:09:04 2011    Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:50:bf:ce...   Sat Oct 29 02:06:40 2011    Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:50:bf:ce...   Sat Oct 29 02:03:23 2011    Critical (3)   No Ranging Response received - T3 time-out;CM-MAC=00:50:bf:ce...   Sat Oct 29 02:00:04 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire FEC f...   Sat Oct 29 02:00:02 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/Q...   Sat Oct 29 02:00:01 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire FEC f...   Sat Oct 29 02:00:01 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/Q...   Sat Oct 29 01:59:42 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire FEC f...   Sat Oct 29 01:59:42 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/Q...   Sat Oct 29 01:59:40 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire FEC f...   Sat Oct 29 01:59:39 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/Q...   Sat Oct 29 01:59:37 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire FEC f...   Sat Oct 29 01:59:35 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/Q...   Sat Oct 29 01:59:20 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire FEC f...   Sat Oct 29 01:59:18 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/Q...   Sat Oct 29 01:59:15 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire FEC f...   Sat Oct 29 01:59:13 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/Q...   Sat Oct 29 01:58:29 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire FEC f...   Sat Oct 29 01:58:27 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/Q...   Sat Oct 29 01:58:07 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire FEC f...   Sat Oct 29 01:58:05 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/Q...   Sat Oct 29 01:57:47 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire FEC f...   Sat Oct 29 01:57:45 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/Q...   Sat Oct 29 01:57:39 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire FEC f...   Sat Oct 29 01:57:37 2011    Critical (3)   SYNC Timing Synchronization failure - Failed to acquire QAM/Q... 

 

Startup Procedure Procedure Status Comment Acquire Downstream Channel 561000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Configuration File OK d11_m_5350_insightstandard_c01.cm Security Enabled BPI+                                     Downstream Bonded ChannelsChannel Lock Status Modulation Channel ID Frequency Power SNR Correctables Uncorrectables 1 Locked QAM256 2 561000000 Hz -3.6 dBmV 39.9 dB 1619 161 2 Locked QAM256 1 579000000 Hz -2.4 dBmV 40.0 dB 1418 249 3 Locked QAM256 3 567000000 Hz -3.1 dBmV 39.9 dB 1537 153 4 Locked QAM256 4 573000000 Hz -2.3 dBmV 39.9 dB 1734 64 5 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 6 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 7 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0 0 8 Not Locked Unknown 0 0 Hz 0.0 dBmV 0.0 dB 0

0

 



 

Total Correctables Total Uncorrectables 6308 627

 

Upstream Bonded ChannelsChannel Lock Status US Channel Type Channel ID Symbol Rate Frequency Power 1 Locked ATDMA 12 5120 Ksym/sec 31600000 Hz 50.7 dBmV 2 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 3 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 4 Not Locked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV

 

 

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The DHCP warning coincides with when I lost my internet connection.  I then unplugged the modem/router for about 30 seconds and plugged it back in.  This always seems to fix the problem for a little while.  But, I never had any problems before June.  I am sorry the information above is so scrambled.  I have tried to paste it twice, but it keeps getting scrambled up because it is apparently "invalid HTML."

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I am not really sure what is going on, but I am starting to get pretty frustrated.  We have had Comcast for years without a problem.  When I started searching for answers on the internet, I quickly found out there are lots of other people having these same issues.  Nothing has changed inside our house, except for the modem/router.  I am not saying that it is not a problem on my end, but there does seem to be a lot of other people experiencing the same issues.

 

Any suggestions where I go from here?  I really hate to leave Comcast, but it is getting to the point where we are seriously considering doing just that.

 

 

Visitor
Posts: 1
Registered: ‎11-12-2008

Re: DHCP WARNING - Non-critical field invalid in response ;CM-MAC...

Only time will tell, but I think the Comcast service tech that just left my house may have fixed my problem. 

 

I'm not sure exactly what all he did, but I know he replaced all of the connections outside.  As soon as he was finished my upstream power improved from 50.7 to 44.2.  My downstream power went from -3.6 with SNR of 39.9, to 1.5 with SNR of 40.1.

 

It may just be my imagination, but I swear my internet is faster than it has ever been.  And, the service guy was really nice.

Connection Expert
EG
Posts: 43,110
Registered: ‎12-24-2003

Re: DHCP WARNING - Non-critical field invalid in response ;CM-MAC...

Those are nearly perfect ! Hope things hold up for you !

Bronze Star Contributor
Posts: 110
Registered: ‎02-23-2009

Re: DHCP WARNING - Non-critical field invalid in response ;CM-MAC...

I get that DHCP Warning in my log as well. Also this:

 

11/04/2011 10.128200050003

Started Unicast Maintenance Ranging - No Response received - T3  time-out