passthrough between the interfaces

hello, i have 3 interfaces, 2 for isp and 1 for clients, i want some clients to connect directly with the one of the isp server ( i choose ), without doing any routes inside the router, just to passthrought the interfaces. thanks

The only thing that comes close to what you describe would be bridging. Whether this would fit your needs and would even be possible with your ISP connection depends on a lot of details that you unfortunately did not provide…

–Tom