2 gateways failover problem

RouterOS Beginner Basics
1

Hello, I’ve tried to make second gateway on mikrotik, and i’ve got some questions about it.
My configuration:
wan1 (main): PPPoE connection via ethernet, real static IP
wan2 (backup): adsl link via modem (dynamic IP, modem works as router, so mikrotik gots virtual IP)

questions:

  1. if i do 2 routes with different distances, and fails something behind gateway, this version doesn’t see this problem (gateway responds, MT thinks, that everything’s OK), how to avoid it? Should I use NETWATCH?
  2. check gateway: ping. I’ve set this option, added firewall output rule to log pings to gateway, waited some time and nothing happened, after that i’ve uset /tools ping [gateway] and got log records, that router had pinged gateway. Now i’m trying to figure out how often MT pings gateway to check connectivity?
2

IF you only want to use the backup when primary fails, it is very simple. Set the PPPoE connection to accept default route which will have a distance of 0. Then add a static default route to the second connection and specify a distance of say 5.

This will use PPPoE connection unless it fails - in which case it fails over to backup

3

See the Wiki is an example: http://wiki.mikrotik.com/wiki/Two_gateways_failover