Multiple Servers with one domain for DNS

[fabriccio]

I’m have installed a VPS with Virtualmin and I using this DNS:

ns1.mydomain.com IP: 111.111.111.111
ns2.mydomain.com IP: 111.111.111.111

Everything OK, but now I need another VPS with this DNS:

• ns3.mydomain.com IP: 222.222.222.222
• ns4.mydomain.com IP: 222.222.222.222

I setup the nameservers on my domain registrant panel, and I make the config of BIND DNS on Virtualmin but it isn’t works.

Anyone help me?

Thanks