On Wed, 3 Jun 2009, Drew Weaver wrote: > Should the additional sites be connected to the primary site > (and/or the Internet directly)? Yes, because any out-of-band synchronization method between the servers at the production site and the servers at the DR site is likely to be more difficult to manage. You could do UUCP over a serial line, but... > What is the best way to handle the routing? Obviously two devices > cannot occupy the same IP address at the same time, so how do you > provide that instant 'cut-over'? This is one of the only instances in which I like NATs. Set up a NAT between the two sites to do static 1-to-1 mapping of each site into a different range for the other, so that the DR servers have the same IP addresses as their production masters, but have a different IP address to synchronize with. -Bill