[dns-operations] register private nameservers in registrar

[风河]

Hello,

With Godaddy we can register a nameserver with multi-ips.
For example,

$ dig nsbeta.info @c0.info.afilias-nst.info

; <<>> DiG 9.6.1-P2 <<>> nsbeta.info @c0.info.afilias-nst.info
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 29457
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 6
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;nsbeta.info.                   IN      A

;; AUTHORITY SECTION:
nsbeta.info.            86400   IN      NS      dwdns1.nsbeta.info.
nsbeta.info.            86400   IN      NS      dwdns2.nsbeta.info.

;; ADDITIONAL SECTION:
dwdns1.nsbeta.info.     86400   IN      A       58.248.181.44
dwdns1.nsbeta.info.     86400   IN      A       113.108.228.172
dwdns1.nsbeta.info.     86400   IN      A       58.215.191.68
dwdns2.nsbeta.info.     86400   IN      A       125.90.88.106
dwdns2.nsbeta.info.     86400   IN      A       182.118.1.100
dwdns2.nsbeta.info.     86400   IN      A       221.5.47.106


In info's NS servers, both dwdns1 and dwdns2.nsbeta.info have 3 IPs.
This can be setup with Godaddy's interface.

But with other registrars like Networksolutions and Namecheap, I can 
setup a nameserver with only one IP.
I have a NS domain in Networksolutions, how to resolve this problem 
rather than transfer it into godaddy?

Thanks.