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Forum Discussion
C7000-100NAS randomly drops internet connection
Hello, My C7000-100NAS modem seems to randomly drop it's Comcast connection. This happen on 2.4 ghz, 5 ghz, and wired connections. There is no pattern, however the dropped connection usually last...
We have Comcast and UPnP is off on the NetGear Not sure why, but when we get a
[DoS attack: TCP- or UDP-based Port Scan] from 75.75.75.75, port 53
75.75.75.75 is Comcast's DNS Server
Our connection is non usable. We also have Magic Jack and when calls are coming in, we answer and loose incoming audio for about 5 to 15 seconds.
When this happens, I check the logs and it shows this [DoS attack: TCP- or UDP-based Port Scan] from 75.75.75.75, port 53 in the logs.
Comcast inside guy says that his meter shows Frequency 603 Errors, while the lineman says that is not what his meter shows. We now have a monitoring device on our pole until Friday.
I am at a loss at this time. Does port 53 have to be open to incomming traffic or can I shut it off some how on this modem. I could do that on my zoom.
During the issues below, our use of the internet is dead.
| 2017-2-1, 04:53:26 | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:7f:b9:d7:20:80;CMTS-MAC=00:01:5c:7f:9a:5a;CM-QOS=1.1;CM-VER=3.0; |
| 2017-2-1, 04:53:29 | Warning (5) | MDD message timeout;CM-MAC=b0:7f:b9:d7:20:80;CMTS-MAC=00:01:5c:7f:9a:5a;CM-QOS=1.1;CM-VER=3.0; |
| 2017-2-1, 04:53:30 | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:7f:b9:d7:20:80;CMTS-MAC=00:01:5c:7f:9a:5a;CM-QOS=1.1;CM-VER=3.0; |
| 2017-2-1, 04:53:36 | Warning (5) | MDD message timeout;CM-MAC=b0:7f:b9:d7:20:80;CMTS-MAC=00:01:5c:7f:9a:5a;CM-QOS=1.1;CM-VER=3.0; |
| 2017-2-1, 04:53:37 | Critical (3) | SYNC Timing Synchronization failure - Failed to acquire FEC framing;CM-MAC=b0:7f:b9:d7:20:80;CMTS-MAC=00:01:5c:7f:9a:5a;CM-QOS=1.1;CM-VER=3.0; |
| 2017-2-1, 15:10:50 | Critical (3) | Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC=b0:7f:b9:d7:20:80;CMTS-MAC=00:01:5c:7f:9a:5a;CM-QOS=1.1;CM-VER=3.0; |
All ideas and suggestions are welcome. There is something causing all of this.
Do any senior techs actually monitor these posts? If this kind of customer feed back happened in my business, I would be out of business.
Suggestions welcome.
Try using OpenDNS for reliable access to the internet and protect against attack. This is a free service ("Home" version of Cisco's OpenDNS).
You can review this option at "www.opendns.net". The service directs internet connections to through safe links. A simple change to either the computer's or router's domain server addresses. It may help with stopping the DoS attacks (unless they are coming through IPv6).
Some anti-virus, etc., programs will shut-off internet service if the computer is under attack. The external attack may also attempt to corrupt the router settings. The OpenDNS domain settings (and service) are designed to prevent such incoming attacks.
NetGear's "parental settings" (via OpenDNS) allow the user to block access to selected internet sites (most which tend to cause DoS, and other nasties).
The OpenDNS service will not correct hardware issues that may related to NetGear's router malfunctions.