route delete 0.0.0.0

set INTERFACE=12
set ROUTER=192.168.1.1

route add 0.0.0.0 MASK 0.0.0.0 %ROUTER% IF %INTERFACE%
route add 192.168.100.0 MASK 255.255.255.0 %ROUTER% IF %INTERFACE%

netsh interface ip set dns %INTERFACE% static %ROUTER% validate=no
netsh interface ip add dns %INTERFACE% 87.237.112.10 index=2 no
netsh interface ip add dns %INTERFACE% 8.8.8.8 index=3 no
netsh interface ip add dns %INTERFACE% 8.8.4.4 index=4 no

route print 0.*.0