Windows 2003 2008 AD sites and services assigning an IP to a site

In AD sites and services, is there any problem assigning a single IP, located on a subnet typically in site A, to Site B?  it looks like we have to have our new exchange 2007 CAS/HUB servers physically in site B, and the mailbox servers in site A, but i know there is a requirement for a CAS and HUB to be in the same site as the mailbox servers.

Thanks in advance,
Matt
mbrombAsked:
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
I'm not sure why only one IP, but it should work:

Setup a new subnet as example:  172.20.2.5/32
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mbrombAuthor Commented:
Well, it would actually be 2 servers, but I would effectively have to add them individually to associate them with the mailbox site.  Ok, so if I add an IP to site A that falls into a subnet assigned to site B it should work?
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Rick FeeMessaging Engineer - Disaster Recovery EngineerCommented:
It should work.
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