Is this possible - nameservers using same IPs

I know that WHM supports different nameservers using the same IPs but I haven't enabled this in WHM. Therefore I got rather surprised Is this possible - nameservers using same IPs when I discovered that a reseller has changed the IPs of his private nameservers (we had a problem with them) to IPs of our anonymous nameservers used in a trust relationship between multiple servers. - And it is working! - So his web site is online using his own private nameservers which again are using IPs not assigned to it in the dns zone file.

Could someone please enlighten me here. I'm not sure what to say to him. If this isn't a problem I won't ask him to change the IPs back, but allow him to use them. But I'm worried that this won't last. Will this continue to work, or could he experience some kind of problems?

Thanks
John

 

 

 

 

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