DNS Probe Not Finished?

Darren

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I've got a TPLink WDR3500 router for use in my apartment for me and my 3 other roommates. There are 5 wall plugs for Ethernet, one in each bedroom and one in the living room. All 4 of us use a wired connection in our bedrooms for our desktops/laptops and then WiFi as well for various devices. I originally had the router plugged in in my room directly to the wall and then another Ethernet cable from it to my desktop. This set up worked with no issue for a week or so but the WiFi coverage was uneven so I moved it out to the living room. I also did not have the 5GHz band on at the time because when I initially tried it, it didn't work.

Now when I first moved it I was dumb and pulled the power plug and Ethernet straight from the wall without even turning it off and plugged it in at the new location. Worked fine actually. Once I rebooted it though a day or so later while enabling the 5GHz and it completely ruined the entire network, dropping various ethernet ports through the house. Network was there, but just didn't load anything at all. I unplugged and replugged my machine (now straight to the wall) and the router and rebooted them both and it seemed happy.

Since then I've had a few very brief outages on one of the wired machines with a "DNS PROBE NOT FINISHED" error in Chrome. I've only seen it on one machine, but the other guys have mentioned it too. I haven't seen it on mine yet, though. This only lasts for a minute or two before fixing itself and is one machine at a time.

Even weirder is that the 2.4GHz channel of the router will now have almost no throughput at times on any device, but the 5GHz channel has speeds like it's a wired connection. There are times when both channels work without issue too. I haven't noticed the 5GHz being useless, but it's not used much so it's fully possible. What could cause something like this? Reboot of the router seems to fix this.

I'm relatively new to networking and don't know much of anything about how the internet is set up here. There's no modem in the apartment that I can see either and the office just said "plug in a router" if we wanted WiFi upon moving in.
 
How many neighboring SSIDs do you have? You should be able to use something like Wifi Analyzer on your phone to see what kind of networks are broadcasting on what channels.

Do you all get public addresses out of the wall on each PC or do the lines terminate into your router specifically?
 
I haven't thoroughly checked the signals of the other networks, but there's easily 5-10 within range of our place, only one or two have much of a signal though.


Didn't check all of them, but my desktop and one other have different IP's, so I'd imagine they're all different. Out of curiosity, does that imply that we have separate bandwidth allocation per port?

They also confirmed that they've all gotten DNS Probe error as well when I asked them.

John, might be the router, but I kinda doubt it. I'll have the ISP out here before I return it, our complex is really good about maintenance requests. Forgot to mention I updated the firmware as part of my diagnosing with the initial identity issues, but it didn't affect that issue.
 
but my desktop and one other have different IP

Same subnet or different? Private (10.0.0.0/8, 172.16.0.0/12 or 192.168.0.0/16), or public (anything else)? I was mainly curious if the apartment terminated each room outlet to a centralized location for Internet or if all of the lines trunked back to your router specifically and then out.

2.4 GHz in apartment scenarios is super-congested, you'll get double interference if your device is on channels other than 1,6 or 11. Use 5 GHz whenever possible since the airspace is much larger.

I'd check what DNS reference you are getting through DHCP on each PC. If it's a crappy provider one try rolling with Google (8.8.8.8, 8.8.4.4) or OpenDNS (208.67.222.222, 208.67.220.220) to see if resolution improves any.
 
I've disabled the 5GHz channel for the time being and have yet to have any issues so far. When I get some time, I'll do some more experimenting.
 
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