Using load balancing router causes problems with Exchange Server
Posted on 2011-04-18
We just set up a load balancing router (Cisco RV042) which joins two 4 Mbps DSL lines coming into our office. We can actually get 8 Mbps downloads at a computer if the rest are fairly idle (which was unexpected; I expected it would allow simultaneous 4 Mbps downloads but not this. Client is thrilled). Anyway, the constant switching of IPs at each computer is causing a lot of issues with our third party Exchange server. By the time it has authenticated in Outlook or OWA, the IP of the computer changes and boom, it needs to reconnect. It actually often completely prevents successful login to OWA and causes Outlook crashes.
What is the best way to fix this? I see an option to limit bandwidth to certain IPs. I think I could tell it to only send traffic to the servers (I have all the IPs) through one of the DSL lines, but that seems like it would make all the computers have the same IP all the time or not be able to connect at all.
I also could assign computers to pools for the lines, but that defeats the purpose. How do I allow each computer to maximize speed while still being able to get email?
I have initiated dialog with the support team of the Exchange host, but if you give a better or faster solution; you get points!
Currently, I just disabled one of the lines, so we're back to one until this is fixed.