Single Static Internet IP, 2 Active Sync Exchange servers

Hello...

I have a bit of a situation.  I'm installing a new server in a multi-tenant building.  There's already an exchange server in the building and I need to setup another one for another tenant in the building but the problem is that the ISP only gives us 1 single static.  My client is unwilling to purchase another static IP.  Is there any creative DNS or NATting I can do to allow both to work on the same static?  It's 2 separate servers on totally different domains.  I'll need OWA and Activesync to work.  Please tell me there's a way..

Thanks!

 - Tim
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TimFarrenAsked:
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Alan HardistyConnect With a Mentor Co-OwnerCommented:
Not going to be possible with just a single static IP and 2 servers - sorry.  How will you tell the router / firewall to forward the right packets to the right server?

You will need that 2nd Fixed IP I'm afraid.

Alan
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tshearonConnect With a Mentor Commented:
The only thing I can think of quickly and cheaply would be to put a HW solution in place (or SW running on server) that would act as a smart host and point your Exchange servers send connectors at them.
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TimFarrenAuthor Commented:
I've got SMTP covered.  There's a way I can handle that.  I need a solution for OWA and Activesync.  Maybe run off an alternate port for the second client?  But I don't know if cell phones would be able to work off an alternat port.
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Alan HardistyConnect With a Mentor Co-OwnerCommented:
You can't ask a mobile device to use another port other than 443 (or 80 if you don't use SSL which isn't remotely recommended), so you can't use port redirection to change the external port to 444 (as an example) and then redirect that to 443 internally on the 2nd server.

Sorry - 2nd IP address is imperative.
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BurundiLappConnect With a Mentor Commented:
This article suggests you can use Activesync on a non-standard port: http://serverfault.com/questions/465568/changing-activesync-port-to-444-while-keeping-owa-and-outlook-anywhere-still-on

However I have not tried this and one of the tenants would have to be the loser and have non standard configs on their devices AND have devices that support non-standard port configs.

To be honest, additional static ip's are going to be much easier in the long run.

HTH
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Alan HardistyConnect With a Mentor Co-OwnerCommented:
That would involve adding a 3rd party device to receive the inbound connections using port 443 - which will already be used by the 1st server, so me thinks that's not going to work.

Alan
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TimFarrenAuthor Commented:
Thanks for your responses.  I'll inform them of the bad news.
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