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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