6 CA servers - 3 internet facing at one site (Site1), 3 non-internet facing at another site (Site2).
6 Mailbox Servers - 3 at Site1 which host all mailboxes for users at Site1, 3 at Site2 which host all mailboxes at Site2.
All user's accessing mailboxes from outside of our network use the 3 CA servers at Site1, these servers are managed via an F5 appliance. If a user in Site2 accesses their mailbox outside of our network, they hit one of three internet facing CA servers at Site1 and get redirected to one of the 3 CA servers at Site2. I realize this is be design in 2010, but here is my question:
How do the CA servers in Site2 load balance traffic coming from the CA Servers in Site1? Without actually having these servers in the F5 pool or managed via WNLB, it doesn't exactly make sense in my mind. In my mind, one of the F5 load balanced CA servers in Site1 would proxy that traffic to a single CA server in Site2, which would leave open the possibility for network related problems if that traffic is destined for a single server in Site2. If I'm incorrect, please help me understand. Also, can someone provide some guidance how to check/configure/manage this as well?