ER605 very slow DNS server

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ER605 very slow DNS server

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ER605 very slow DNS server
ER605 very slow DNS server
2021-07-09 03:16:06 - last edited 2021-07-14 10:37:29
Model: ER605 (TL-R605)  
Hardware Version: V1
Firmware Version: 1.1.0

Hi TpLink team,

 

I have noticed a bug in the dns server/forwarder in my router.

 

I have needed to set the router to issue my ISPs dns server (119.40.106.35) to the LAN as primary, along with the routers (192.168.0.1), as the router DNS is exceptionally slow.

It is not always slow, but is often consistently taking 2 seconds to resolve hostnames, which is long enough to get an NSLOOKUP timeout in windows.

 

The router is pointing to my ISPs DNS server 119.40.106.35, and when performance testing the router DNS it is exceptionally slow in comparison. When it should only be a very minor latency impact as the router should be acting as a dumb forwarder back and forward from the ISP DNS servers received via DHCP.

 

I have my router attached to Omada OC200.

 

DNS benchmark results:

 

It looks mainly as though the ER605 is struggling with dot.com lookups.

 

 

When performing nslookup in windows, we can see 192.168.0.1 first times out before responding. ISP dns works as normal/responds immediately.

 

 

Thanks.

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#1
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3 Reply
Re:ER605 very slow DNS server
2021-07-14 08:58:42

@add1n1 

 

You can set your ISP's DNS server on WAN interface

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#2
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Re:ER605 very slow DNS server
2021-07-14 10:29:36

@Somnus It is set to my ISPs dns. I am pointing out that the DNS forwarder in the router is adding massive latency/slowness to the simple task of forwarding dns requests to my ISPs dns and back.

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#3
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Re:ER605 very slow DNS server
2021-07-22 08:34:43

@add1n1 

 

Can you share some more details on your setup to analyze the problem further?

 

1. How many WAN i/f you have

2. Configuration of them

3. Routing table  details (Transmission ->Routing->Routing Table)

 

 

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#4
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