---

/ip route set [find dst-address="0.0.0.0/0" gateway="149.126.21.1"] comment="ISP_MAIN"


/ip route add dst-address=8.8.8.8/32 gateway=149.126.21.1 comment="Check-Host ISP_MAIN"


/tool netwatch
add host=8.8.8.8 interval=10s timeout=2s \
down-script="/ip route disable [find comment=\"ISP_MAIN\"]" \
up-script="/ip route enable [find comment=\"ISP_MAIN\"]"