DNS Catch not working

RouterOS General
1

I followed the guide at http://wiki.mikrotik.com/wiki/Force_users_to_use_specified_DNS_server to force users to use our DNS. Unfortunately it is not working. This is just a small test network.

For this example my routers WAN is 172.25.25.254 and the local port has 192.168.50.1. The router has DNS cache

I made the following rules on the router as per the guide. But with this enabled DNS will not resolve using 8.8.8.8 on the client.

add chain=dstnat action=dst-nat to-addresses=192.168.50.1 to-ports=53 protocol=udp dst-port=53
add chain=dstnat action=dst-nat to-addresses=192.168.50.1 to-ports=53 protocol=tcp dst-port=53
2

Try changing the action to redirect.