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Latency with pi-hole + wireguard (docs.pi-hole.net)

submitted 1 month ago* (last edited 1 month ago) by [email protected] to c/[email protected]

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Hi guys for those of you that use pi-hole (or similar solutions like adguard home, etc) and wireguard how far away can you be from your wireguard/pi-hole server before latency becomes a major issue?

Also on a side note how many milliseconds of latency would you guys consider to be to slow?

Edit I meant dns latency sorry for not mentioning

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[–] [email protected] 2 points 1 month ago (5 children)

I have Wireguard and I forward DNS and my internal traffic from my phone over the VPN to my pi-hole at home. All other traffic goes directly over the Internet, not the VPN. So that means only DNS encounters higher latency.

However, because a lot of companies do DNS based geo load balancing that means even if I'm on the east coast all my traffic gets sent to the West Coast because my DNS server is located there. That right there has the biggest impact on latency.

It's tolerable on the same continent, but once I start getting into other continents then it gets a bit slow.

[–] [email protected] 2 points 1 month ago (1 children)

Interesting I always assumed they used ip not dns for geo locating cdns.

[–] [email protected] 2 points 1 month ago

There's two main ways of doing geo-based load balancing:

IP Any-casting - In this case, an IP address is "homed" in multiple spots and through the magic of IP routing, it arrives at the nearest location. This is exactly how 1.1.1.1 and 8.8.8.8 work. It works fine for stateless packets like DNS, however it has some risks for stateful traffic like HTTP.
DNS based load balancing. A server receives a request for "google.com", looks at the IP of the DNS server and/or the EDNS Client IP in the DNS query packet and returns an IP that's near. The problem is that when you're doing Wireguard, it goes phone -> pi-hole (source IP is some internal IP) -> the next hop (e.g. 1.1.1.1 or 8.8.8.8), which sees the packet is coming from your home/pi-hole's public IP. Thus it gets confused and thinks you're in a different location than you really are. Neither of these hops really knows your true location of your phone/mobile device.

Of course, this doesn't matter for companies that only have one data center.

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