Documentation - "Check for and disable antivirus anti-DNS Poisoning measures" should be in Common Issues.

[tyrfing666]

I just implemented lancache on my home network. The largest problem was that my game machine just would not use the cache server IP for most of the domains (the weird bit was that some of the domains would work, so it was off-and-on).

Tried many things but the real issue was my antivirus.

There is a component of Avast called "Real Site" which is designed to prevent DNS poisoning. Since that is exactly what we're trying to do, this component must be turned off for it to work.

The documentation does mention DNS poisoning, but I think it would be a good idea to call out in the "Common Issues" part of the guide that this is an issue if you have antivirus software and to check it if there are problems. Some screenshots of common types of antivirus software and where to turn this off (like the router DNS guide that you already have) would be very helpful.

Some screenshots:
Litmus test with Real Site turned on:

Litmus test with Real Site turned off (Flush DNS cache and restart browser first):

Turning off Real Site

Real Site turned off:

Real Site turned on:

Real Site location within Avast: