[This is pre-release documentation and subject to change in future releases. This topic's current status is: Milestone-Ready]

Topic Last Modified: 2010-07-15

Unlike Microsoft Office Communications Server 2007 R2, Microsoft Communications Server 2010 supports placing Access, Web Conferencing and A/V Edge external interfaces behind a router or firewall that performs NAT for both single and scaled consolidated Edge server topologies.

Using NAT for all Edge external interfaces requires the use of DNS load balancing. In turn, using DNS load balancing allows you to reduce the number of public IP address per Edge server in an Edge pool as described below:

  • Communications Server 2010 Scaled Consolidated Edge (DNS load balancing). Requires 3 public IP address for load balancer virtual IP addresses (one time requirement that does not increment as more Edge servers are added to the pool), and 3 public IP addresses per Edge server in a pool.

  • Communications Server 2010 Scaled Consolidated Edge (hardware load balancing). Requires 3 public IP addresses per Edge server in a pool.

IP Address Requirements for Scaled Consolidated Edge

# of Edge Servers per pool # of required IP addresses Communications Server 2010 (DNS load balancing) # of required IP addressesCommunications Server 2010 (Hardware load balancing)

2

6

3 + 6

3

9

3 + 9

4

12

3 + 12

5

15

3 + 15