Member Avatar for rryman

Hi,

I keep getting a limited or no connectivity problem with my linksys router and comcast modem. The problem is reoccurring and is temporarily solved by resetting the modem AND the router. I also discovered last night that it sometimes fixes itself. I was online and then lost my connection, receiving the error message "limited or no connectivity". I restarted my laptop but to no avail. I was too tired to go downstairs to reset everything so I went to bed. This morning, my connection was ok. Also, as a side note, I often get an ip address conflict message. It does not seem to effect my connection though. Any help or insight is greatly appreciated.

Thanks,

Bob

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  • Latest Post Latest Post by briangreen143

Dani AI

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Intermittent "Limited or no connectivity" plus occasional "IP address conflict" usually points to one of three things: a DHCP/duplicate-IP issue on the LAN, a flaky router (firmware, hardware, or overheating), or the modem/ISP side (modem caching a MAC or unstable upstream). 's DHCP/wired-vs-wireless question is relevant, and 's suggestion to bypass the router is the right first isolation step.

A recommended isolation workflow:

  • Power down the modem, connect a single computer directly to the modem’s Ethernet, then power the modem back up and wait for full sync (do not skip the modem power cycle; many modems cache the previous MAC).
  • From Windows run:
    ipconfig /release
ipconfig /renew
ipconfig /all
  • If the direct-connection session is stable and a public IP is assigned, the router is the likely culprit. If instability remains, the modem or ISP is likely at fault.

If the router is at fault: update Linksys firmware, factory-reset and reconfigure, check the DHCP scope size and lease time (short leases can cause churn), remove any static addresses that overlap the DHCP pool, and use DHCP reservations for devices that need fixed IPs. Change the LAN subnet (for example 192.168.2.x instead of 192.168.1.x) if the modem/router also uses 192.168.1.x to avoid overlap. Inspect router logs for repeated DHCP errors and test with a different Ethernet cable and a different router port.

If the modem/ISP is at fault: request a modem swap or ask the ISP to check signal levels and whether the modem is caching MAC addresses or handing out duplicate leases. Final checks: verify only one DHCP server runs on the LAN, look for devices with manually set IPs that duplicate DHCP assignments, and monitor router/modem logs for timestamps that match drops.

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Member Avatar for Member #119018

How many users are connected to the network at any given time? Do you use DHCP? Are you connected by a cable or wirelessly?

Member Avatar for briangreen143

if you own the modem from comcast, you can definitely have it checked or replaced. I worked with comcast before. Also, if you are renting the modem with comcast you definitely have a free router. But there is a shipping fee. Then you can have the chat support help you with installation. Have you tried bypassing the router and directly connect the modem to the computer?

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