the question i have is.
IF we have two sites that have different external IPSs, both sites are connect by a VPN, and there is an array of CAS. Users conect to mail.domain.com. How do i configure the External DNS so if 1 of the site is down beacuse of power outage mail.domain.com will go to the other site?
Do you use Round Robin in this CAS? OR you have to switch the DNS manually?