Lync Edge Servers Default Gateway - HELP

The BIG-IP can proxy all the connections between the client and the Edge, but that's not the ideal configuration. You want the Edge servers to be able to set up direct connections with the external clients, and connections between the clients themselves. This blog post explains it better than I can: https://devcentral.f5.com/blogs/us/the-hopefully-definitive-guide-to-load-balancing-lync-edge-servers-with-a-hardware-load-balancer

 

 

Sounds like you are already correctly using public IPs for your external Edge interfaces. Do you have SNAT enabled on the A/V VIPs? If you do, the Edge servers won't see the real IPs of the clients when the first connect, and BIG-IP will have to proxy all the connections. It shouldn't really matter where you route through as long as the Edge servers can talk with the clients at their real IP addresses.