Microsoft® Lync Server 2010 Unleashed

Publicly Routable Perimeter Network

One consideration when planning for Edge services is determining whether the perimeter network contains publicly routable IP addresses. A publicly routable address space is a set of public IP addresses that reach a server directly without any kind of network address translation (NAT). This means public IP addresses are bound directly to the Edge Server network interfaces.

Caution

Typically, this suggestion is met with a negative reaction from network security teams that are accustomed to using NAT to allow external access to any service. It is important to note that NAT is not a method of security. Instead, it is designed to accommodate a shortage of IPv4 addresses and although it might mask a server’s internal ...