I have a quick question; I installed a multihomed linux box as a router between two ethernet Networks.
I also configured a firewall to allow only acces to ports 22 53 on eth0 and allow access to ports 53 80 81 445 5902 on eth1.
When i run an nmap scan on eth0 and eth1 I find the same list of open ports.
When I port scan the linux router from any other computer from either Network segment it shows me that only the configured ports are open ;-)
I would like to know why I get differnt nmap results when scanning eth0 or eth1 on the router from the router itself, as when i am scanning the router interfaces from other hosts.