# isp1
:local wan1 [/interface get [find comment=ISP1] name];
:local NewGW [/ip address get [find interface=$wan1] network];
/ip route set [find comment="recursive gateway for PRIMARY ISP (Gateaway IP to be adjusted when ISP changes it)"] gateway=$NewGW;
:log warning ("New ISP1 gateway: ".($NewGW))}