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I'm having a fairly consistent issue with one of the wireless networks I regularly connect to:
The connection drops. It doesn't disconnect from the wireless router, just loses internet connectivity.
The wireless router is a D-link dir 601B. Thinking it was the firmware being out of date, I updated it months ago to D-Link's most recent stable update for the specific router model.
After this, I realized it was a fairly consistent issue around lunch time, so I changed the channel and frequency to Channel 11 - 2.462GHz to avoid overlap with the microwave. Fairly certain there aren't any other devices at the 2.4GHz range in the room.
Power cycling the router sometimes works, but sometimes doesn't.
The oddest thing about this is that I can connect directly to the wireless router when it drops the internet, the router's connectivity test is fine and completes, I can ping and connect to the ISP's router (the wireless router is connected to the hardwired ISP router), but still no internet.
It seems that when this problem occurs, DNS connections are still active - when pinging a website it's still able to find the correct IP address.
I've tried everything in my own repertoire of router troubleshooting, and haven't found any similar issues throughout Stack Exchange or anywhere else, so figured it was time to ask the group. Happy to answer any further questions about the router configuration to resolve this issue.