MikroTik

Can i ask you, using VRRP is good, one master one back up, but can VRRP change the way if master fall over? (means router is active but gateway is down),

Thanks

In VRRP when master fail, backup get active role. Of course you need redundat ISP connection. In "on master" and "on backup" you can enable or disable ISP interface.

i did, but backup has been activated after master has been off. advice is going on dose't matter gateway is active or no

You have 3 seconds aprox (in my case) down to backup detected a master has down, but this time pass all work without problem. When master go up backup wait.

now i see, VRRP is for one ISP, i was trying with 2 ISP and i was like to automatically change the gateway if one of them gets DNS down.

You can use 2 ISP without problem, but vrrp it's for router hight availability, if You like change ISP or gateway no need vrrp You can check with scripting ISP1 ping and change default gw to ISP2 when ISP1 fácil.