Mikrotik Failover to a Second Internet Connection

http://stevedischer.com/another-way-to-do-automatic-failover-with-mikrotik-routeros/

http://wiki.mikrotik.com/wiki/Two_gateways_failover

http://wiki.mikrotik.com/wiki/Failover_Scripting

http://wiki.mikrotik.com/wiki/Failover_via_Netwatch_III_%28English%29

http://wiki.mikrotik.com/wiki/Improved_Load_Balancing_over_Multiple_Gateways_Failover_Script

http://wiki.mikrotik.com/wiki/Manual:VRRP-examples