DNS Problems

[ChappyHova]

Haven't had any problems with the Netduma since the last power cut we had, had another a couple of days ago and now at random intervals all devices connected will have a problem with DNS? I'm not great with networks so wasn't sure how to fix it but it can happen anywhere from every hour or so to every 5 minutes. 

 

Chrome will say something along the lines of DNS probe finished no internet. My PS4 will say it didn't get a DNS back within the right time frame. It's really strange and annoying, it sorts itself out within 30 seconds or so and the internet will be working again but it's constantly happening over the last 48 hours. I've tried restarting the router and the modem multiple times, I've tried factory resetting the router but it's still happening although admittedly not as much as it was yesterday. 

 

Like I say the router went a bit wonky last time we had a power cut and seemed to sort itself out but it's doing it again after a recent power cut. 

[BlitzOmenz]

Maybe you could try changing your routers dns servers that it uses. It might help. I used namebench to find the best most responsive dns servers in my area. I'm no technical expert at this stuff but that's what I would try if no one else has any ideas. Look up namebench and how to use it on YouTube if you haven't heard of it and see if different dns servers fix it. I changed my servers a long while back trying to get better performance and I think it was worth it. It can't hurt. Best of luck.

[Netduma Fraser]

Very strange. It could be that the ISP is having issues with their DNS servers. Either way I would recommend the advice above and seeing if that resolves your issue.

[Knomax]

You can "run" NameBench  

 

NameBench is a great free, open-source DNS benchmarking utility available for Windows, Mac OS X and UNIX.

 

"By default, NameBench tests your current DNS servers while also letting you enter specific addresses of other servers. Additionally, you can enable an option to include some of the most popular public DNS servers, such as Google, OpenDNS and UltraDNS. Another option will test the fastest regional DNS servers in your area. Furthermore, you can have NameBench include censorship checks to test those that provide filtering services.

 

After running NameBench, the results will show you the fastest DNS server available for your particular computer, based upon the exact web sites you visit using the browser cache of your choice, or if you prefer, NameBench can check using the top 2,000 websites listed by Alexa. In the end, it will provide a prioritized list of three server addresses it recommends."

 

 

Or use GRC's DNS Benchmark  

 

"When you open the DNS Benchmark program, you can read about what DNS is and how the tool can help on the Introduction tab. Then on the Nameservers tab you can see the list of servers that will be tested, along with their IP address and hostname. On the Ownersub-tab you can see the server IPs along with the company's name.

 

On the Status sub-tab you can see which servers are responding. On the Response Time sub-tab you'll see a performance bar chart summarizing each DNS server's performance after testing is complete.

 

By default, DNS Benchmark tests your current DNS server and a few other popular ones, such as Google, OpenDNS and UltraDNS. You can also enter specific addresses of other servers, or use DNS Benchmark's feature for finding the top fastest 50. After starting the benchmark testing, you can see real-time results on the Tabular Data sub-tab. Then when complete, the final results will be shown along with personalized recommendations.

 

Unlike NameBench, DNS Benchmark won't test the DNS speeds by resolving the domains you've already visited using your browser cache. GRC's tool instead checks speeds by resolving the domains from the top 50 websites, but that list is customizable."

 

Tutorial _1

 

Tutorial _2

 

*First tutorial is better.