This is a very basic question, I realize, yet I can't find the answer anywhere.
The situation is simple: I have a router from my ISP, behind which I'm running a few (home)servers. Port forwarding is set up on the router on only a few ports, to select computers. For instance, I need to connect via RDP using port 443 at work, so that's forwarded to one computer specifically.
Yet a different server entirely (on a different local IP) has an amazing amount of blocked traffic incoming on that port. Furthermore, there's a whole slew of other ports that this server is often blocking.
How come this traffic is even reaching that server's firewall? Shouldn't the router be doing that job?