Why I need 2 ips using one dedicated server?
Why ns1.domain.net and ns2.domain.net?
Why not one name server and one ip for a DS?
I will apreciate your answers.

It is possible to host over 100 [or any number for that matter] sites on a single IP

But internic needs 2 nameservers for a domain registration and you need 2 diff IP's for that.

If you can keep your DNS outside your server you dont need anymore than one IP

But you cant host SSL based sites.

thank you....