Diagram:
1. I need to block DHCP between these two Mikrotik routers (I did try to block input/output/forward ports 67-68 UDP but 192.168.0.0/24 PC's are still getting 172.16.0.0/24) any clue about this.
Bridge PPTP tutorial I was using:
http://u.nu/42vn6
So how to block DHCP?
2. How to force group1 to use WAN2, and group2 WAN3 without breaking current network configuration?
At my home I have two WAN's and I use Mangle with route-marking to force some users using WAN1 and other using WAN2.
But I'm not sure if Mangle will work with above configuration, and I have really short time to test/change configuration.