Thanks for the speedy reply.
I'm a little confused. I have 2 ips. I intended to use the one for ns1.domain.com and main domain name for shared hosting and ip2 for ns2.domain.com for second nameserver. Server 1 is called inv.domain.com and server2 is called ns2.domain.com
I see that it does work if I use the same ip for both ns's but some tlds dont allow that - ie co.za
If I just setup machine 2 as ns2.domain.com and create records for ns2.domain.com can I still have one machine update the other ? if yes how ? or will I have to just create zone files without setting up mx www etc
Also...I created the ns at the registrar, will ipconfig be happy with that as master domain during setup or should I use the master domain I used on server1 ?