Optional DC based on dynamic IP address

Hi folks,
my question is really simple and the answer might be obvious to you but since I'm not and expert in Windows (and I'm asked to back my answer with examples) I would like to check it with you.
I have only found this thread similar in topic where the guy is putting a second DC with dynamic IP  and nobody warns him from doing it, actually give him help.
http://social.technet.microsoft.com/Forums/en-US/5f0398de-d0cd-4a57-bc8b-a483a91ebd80/how-to-add-additional-domain-controller-to-a-primary-domain-controller-having-a-dynamic-ip-address?forum=winservermanager
As to my case, we have two DCs (on the same LAN) and recently a third one was added for redundancy reasons, reachable through VPN (setup by other devices).
I always apply the general rule SERVER => static IP address and this situation falls within it imo.
I should give management the answer on whether this is recommended/discouraged bringing examples of any hindrances/problems that in your opinion this could cause.
Thanks in advance, Alex

Hi Muhammad,
I totally back your point of view. Such request comes from management and they would like me to explain why such a server canNOT have a dynamic IP address. In particular would be great to know which other problems (beyond dns cache is a good one) we may
hit, I mean they propose to rely on another DHCP server where the MAC address can be tied to a specific MAC address.
I guess that such implementation is seldom done and hence we don't have case studies where they proved that using dynamic IP addresses is not recommended or bad.
Thanks again, Alex
Alex

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