My VPS hosting provider has agreed that I can use their DNS servers to present a more professional look by giving out vanity nameservers to my clients.
For example, they have said I need a DNS records directing ns1.MyDomain.com to the IP of ns1.VPSProvider.com.
Therefore any DNS queries sent to ns1.MyDomain.com will then be sent to the IP for ns1.VPSProvider.com instead and they will respond
The domain is registered with 123-reg. Therefore, how/where do I add a dns record for ns1.MyDomain.com would it be with 123-reg's help? Is it just a CNAME record of ns1?
Secondly, are their any disadvantages by having a vanity nameserver like this e.g. spam, google, rdns etc