Login to Appliance Administrator
click on services
click on the yellow pencil for DNS/BIND Name Server
This is where you're going to modify your DNS server settings.
--> The 2nd DNS IP and server name (assigned by your serviece provider) would first be entered into "DNS Manager" - Default Settings - Virtual DNS
Going to zone (ie mycompany.com), and assuming your service provider has assigned you the following IP's:
IP is 184.108.40.206
which you want to point from ns.mycompany.com
--> ns.mycompany.com Host(A) 220.127.116.11
IP is 18.104.22.168
which you want to point from ns2.mycompany.com
--> ns2.mycompany.com Host(A) 22.214.171.124
After you've created the new A records for the DNS servers, you can go ahead and change the NS records to point to ns1 and ns2.
--> mycompany.com Name Server (NS) ns1.mycompany.com
--> mycompany.com Name Server (NS) ns2.mycompnay.com
Make sure the reverse zones are setup correctly for all your domains.
Did they give you other name assignment for ns1 and ns2? Normally, the primary dns server name is the same as your Ensim server. If this is the case, then you're just going to add another A record to the same IP. (Same for the 2ndary DNS server.)
Also, click on Appliance on the Appliance Administrator - this will show your current Primary DNS and Secondary DNS. You might want to have your server provider change these to your own dns servers - ns1 and ns2 IP addresses.
To test your DNS server, you might want to setup your workstation to utilize ns1 and ns2 in DNS settings. See if everything resolves correctly - or simply use whois, nslookup and ping commands to trouble shoot your DNS problems. Make sure your DNS records are correct with the internic.
There is a really good O'Reilly book on DNS and BIND....
You service provider should also be able to help you out....