Contributor
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25 Messages
LAN ports dead or....?
Recently my Night Owl CCTV DVR lost connectivity to my Xfinity/Comcast modem/gateway.
I've changed out the CAT5 cable with spares, one of which was a new unused cable, with no luck. Tried an old (Slow) laptop with a LAN port and could not get a wired connection through the modem either. Wireless works, but not wired, and I don't think I have any other devices to check the wired connection.
There are no lights illuminated/flashing on the modem's LAN ports. My modem model number according to the label is CGM4331COM.
How do I verify/confirm if the LAN ports on the modem are functional or not? As this will determine if I need to replace the modem or the CCTV DVR. I don't know if an old school loop-back test can be done on the modem.
Edited to add: Oops, my all in one desktop PC has a LAN port on it. I tired to hook it up to the modem. Basically got an error message that the modem wasn't receiving/sending packets. Ran the network repair utility and came back with the same message that PC and modem were not talking to one another.
I can connect via a wireless connection but not wired and my CCTV DVR needs a wired connection.
Accepted Solution
EG
Expert
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110K Messages
2 years ago
FWIW. This isn't a fix but there have been many posts here lately indicating that the LAN / ethernet ports for that model device have suddenly stopped functioning. You may want to try getting it swapped out for another. Good luck !
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USAF-Sarge-Ret
Contributor
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25 Messages
2 years ago
Update:
After sleeping on it, and waking up with a fresh mind, I checked all the ports.
Ports 1, 2, and 3 are dead, port 4 with the red stripe is functional. So at least I can view my cameras and receive alerts when I'm out.
Still no rhyme or reason as to why ports 1-3 died out of the blue, on a modem that has been installed less then 4 months.
(edited)
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zip21222
Contributor
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160 Messages
2 years ago
@USAF-Sarge-Ret
um, is the gateway in bridge mode?
I seem to recall reading here that some gateways only enable a single ethernet port when running in bridge mode...
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EG
Expert
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110K Messages
2 years ago
@USAF-Sarge-Ret
FWIW. You stated that the wireless / WiFi works. If it were in bridge mode, the WiFi wouldn't work.
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