On Wed, 30 May 2012, Ram wrote: > So if not DNS based fail over , what is the other alternative. > I cant move the IP , or re-announce BGP > I cant have both servers in active-active mode DNS failover is your best overall option for this case unless you an exceptionally large budget to spend on this. You would need to do some research on how many of your end-user clients suffer from non-conforming DNS resolution behaviours and just send them instructions on how to manually refresh the DNS records when they complain they can't reach the email server. Depending on which failure modes you regard as most likely or damaging, you could announce via DNS a proxy IP which redirects to a working back-end. You would need to be confident that proxy IP would provide higher availability than your mail server though. - Mark ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
