Quick question re internet facing servers

[Django x2]

What's the best way to do this.

I have to servers that need to face the internet through one IP.

The router already has the exchange server in the DMZ but ideally, I want the Lync 2010 server to face the internet too.

Any ideas?

 

[Django x2]

What about just opening a port and directing inbound traffic to the ip of the Lync server?