- External User Access
- Public IM connectivity
- Federation communication
- Push notification for Lync 2010 mobility client
For more information on setting network interfaces for Lync Server 2010 edge server role, please refer the following document Microsoft TechNet document:
Set Up Network Interfaces for Edge Servers
Note: The Lync server 2010 edge server role is a multi-homed computer with external and internal facing interfaces. The internal and external subnets must not be routable to each other.