Check gateway

Hi,

I’m using RB750 with two WAN link-
On ether1 and ether2 I’ve to DSL router (with LAN ip address 192.168.1.1 and 192.168.2.1 respectively).
My goal is to use ether2 as failover link.
But.. how can I check if Internet is reacheable/unreacheable through ether1?
Of course I cannot ping 192.168.1.1 because this is forever ok.
Any suggestion?
Thankyou!

http://forum.mikrotik.com/t/2-dynamic-isps-enabling-failover/61975/1