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 Unifi Connection Issue to International Server, Occured usually at night 9-11pm

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deric88
post Jun 14 2021, 03:41 PM

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I've just noticed this. When using Cloudflare 1.1.1.1, facebook.com resolves to the US IP address. When using other DNS server like 8.8.8.8, or Unifi's 1.9.1.9, the resolved IP address is a local KUL CDN:

CODE
deric@Derics-MBP-2020 ~ % nslookup facebook.com 8.8.8.8
Server:  8.8.8.8
Address: 8.8.8.8#53

Non-authoritative answer:
Name: facebook.com
Address: 179.60.194.35

deric@Derics-MBP-2020 ~ % nslookup facebook.com 1.1.1.1
Server:  1.1.1.1
Address: 1.1.1.1#53

Non-authoritative answer:
Name: facebook.com
Address: 157.240.11.35

deric@Derics-MBP-2020 ~ % nslookup facebook.com 1.9.1.9
Server:  1.9.1.9
Address: 1.9.1.9#53

Non-authoritative answer:
Name: facebook.com
Address: 179.60.194.35



CODE
ip: "179.60.194.35"
success: true
type: "IPv4"
continent: "Asia"
continent_code: "AS"
country: "Malaysia"

ip: "157.240.11.35"
success: true
type: "IPv4"
continent: "North America"
continent_code: "NA"
country: "United States"


Is Cloudflare causing some suboptimal routes through it's DNS resolution?
deric88
post Jun 14 2021, 03:51 PM

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QUOTE(PRSXFENG @ Jun 14 2021, 03:47 PM)
Something something edns subset client I can't remember but it's related to that
*
Yeah, just did some reading, Cloudflare does not send your IP subnet for resolving, for privacy.

QUOTE
1.1.1.1 is a privacy centric resolver so it does not send any client IP information and does not send the EDNS Client Subnet Header to authoritative servers.




https://developers.cloudflare.com/1.1.1.1/n...-gritty-details
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