Great, thanks very much for all your help!
I'm now a bit confused on how exactly to make a split-DNS setup. I'm currently reading this
page on how to make a split-DNS setup, but I don't fully understand how it works, as my DNS server contains the record for biased.org, and sends it to other DNS servers, which in turn propogates it around the world. Obviously, the world don't need to know my internal addresses, so how does this work, exactly? Or is there a better guide around I can use?
Acutally, reading around a bit, I seem to need to set up the server to direct internal lookups to a different file to what external lookups are allowed, using "forwarders" apparently, but still not sure how to set it all up, as I already have forwarders defined which are external servers which seems to be my own ISP nameservers.
What should I do now?
Thanks so much for your help again!