Hello Luke, Thanks for the advice, I got it to work :-) I already had those rules (or at least I thought I did), but I decided to break down the setup a bit more and assign 172.16.2.1 (on the main router) and 172.16.2.2 for office 2, 172.16.3.1 (again on the main router) and 172.16.3.2 for office 3....