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Forum Discussion
Orbi RBR50 1 second delay for DNS lookup
Hi, I am running an Orbi RBR50 with 2 satellites and software V2.3.1.48. Whenever there is a DNS lookup through the Orbi router it adds a 1 second delay, measured using
"time dig www.bbc.co.uk". T...
Steven36 wrote:
Hi, I am running an Orbi RBR50 with 2 satellites and software V2.3.1.48. Whenever there is a DNS lookup through the Orbi router it adds a 1 second delay, measured using "time dig www.bbc.co.uk"
This does not match my experience. I checked dns performance using "time dig www.bbc.co.uk" using a linux machine connected to the Orbi with WiFi two ways: (1) using Orbi as the dns server, which pointed to the Spectrum dns servers, and (2) setting the Google dns server (8.8.8.8) as a static dns entry.
Orbi/Spectrum DNS Google DNS
real 0m0.093s real 0m0.114s
user 0m0.057s user 0m0.067s
sys 0m0.019s sys 0m0.009s
As far as I can see, there is no obvious difference between having a DNS query pass through Orbi's DNS and then through Spectrum versus going directly to Google DNS.
(oh damn) I forgot that DNS "caches" entries, so the first time I looked up www.bbc.co.uk, the Orbi probably holds the results until the "time to live" expires. (and, similarly with Spectrum & Google). I am not confident that I know a way to adequately test this situation.
Did another test. Configured linux box to use Google DNS and looked up phillips.com, lenovo.com, elon.edu, esc.edu (URL's that I have not used in over a week). Then, changed back to resolve through the Orbi, which in turn uses Spectrum DNS servers. No significant difference in response. Certainly, never got a one second delay in DNS from Orbi.
This is not to say that this has not or does not happen. "Facts are facts." What is frustrating is not being able to reproduce the phenomenon or offer an explanation.