I have an internal network inside my LAN. The clients are connected via router to the main LAN. In the main LAN there is a connection to internet.
I set up a proxy in the main LAN and connected the clients to that proxy (by the internet properties in Windows ) and it works fine.
The proxy is a SQUID type listening to port 3128.
The problem is that I want to block all other ports in the internal LAN except for the proxy port (3128). I want to force those clients to use the proxy in any case.
When I did that there is no Internet. I suspect there are more port/s I should open. I played with it and found out that it always change... there are port/s above 55200... I cant find it... I think its dynamic.
network scheme :
--internal lan - - clients - clients ---- router -- - primary lan --- internet ----------- - - proxy server