Hi @TigerJP 

Thanks for posting in our business forum.

First, I think you might wanna take a look at the existing post: TP-Link ER707-M2 DNS PROBLEMS (RESOLVED)

I have a question about how you tested it out. Have you ruled out that the DNS server is not the fastest in your region?

Second, please provide a diagram of your network if you need to diagnose this further. As well as your test and verification steps and results.

Any DNS-related settings you have enabled on the router, please specify.

Hi @TigerJP 

Thanks for posting in our business forum.

TigerJP wrote

  @Clive_A Thanks for your reply. I've read the post you added although I'm unsure about the next step from there.

 

Before running namebench/DNSBench, I was simply able to verify that there is significant difference because the experience of same web page browsing was day and night when using what's given by the internal DHCP server vs. setting the external DNS server directly on the interface (on OS setting). Often times, I'd get the timeout. That resolved immediately by setting the same external DNS servers directly on the network interface setting.

 

Note that this won't be a matter of finding the fastest DNS server because I've listed the same DNS servers on the router (instead of what's given by ISP because as you said, I wanted to rule out ISP's DNS server performance first) which are 1.1.1.1 and 8.8.8.8. That means the same DNS servers specified on the router as well as the client's network setting. Since both are using the same external DNS server, there shouldn't be any difference, right? If they are slow by a few ms than other regional DNS servers that may be faster, that should be consistent, but that's not the case here.

 

I also have validated that this isn't specific to the client issue, by testing out using a different OS. Both clients are hard wired on same LAN/VLAN. 

 

I'm unsure if the diagram I'm attaching is what you meant by, but it's pretty much simple setup. Both testbenches are connected to SG2210P via switching hub.

 

 

 

 

And here's the DNS related settings on the router. Pretty basic setup.

 

 

 

I can attach the namebench results as I get them. Did you want me to test with what's given by the router vs. manually setting the same external DNS severs on the network setting on the testbench? Also, if you have a better way to validate this, please advise.

So, what's the slowness about? That's what I want to ask. I might not get myself clear.

Is this about the resolution speed or the router relay your DNS query from the test bench(or a client) to the ISP-grade router then to the DNS server?

This is what I want to isolate and get from your description.

I really cannot think of how the router affects your DNS resolution or a way to validate that as the router purely relays the DNS query like the topology above. There is no such issue reported on the forum or internally. These are purely false alarms and latency issues.

Test result screenshots would be great. More info would be helpful.