Windows – How to use DNS over TCP

If you are using glibc you can use the undocumented use-vc option (see resolv/res_init.c in the glib source code) which forces the libc resolver to always use TCP.

Either set it globally in resolv.conf:

options use-vc nameserver 1.2.3.4

Or pass the option in the environment:

RES_OPTIONS=use-vc firefox

It will not work if the application implemented its own support for DNS without using the libc res_init/res_query/… functions. It's working with Firefox (probably as long as you are not using the "remote DNS" option in the SOCKS proxy settings).

Not sure if you'll find a solution to do that on your consumer grade router. Essentially you need a server to sit in the middle of your connection, or proxy to sit in the middle and intercept all traffic going to the Google DNS servers and rebuild the packets to redirect to an alternate destination.

I'm sure you looked into the windows HOSTS file, and realized that it will only supersede DNS requests, which is not going to help you here.

Looks like you'll need to sit a Linux or Server 2003+ machine between your server and the router. Take a look at IPv4 to IPv4 Interface PortProxying.

http://technet.microsoft.com/en-us/library/cc731068%28v=ws.10%29.aspx