i have a machine acting as a gateway and connected to internal and external network. Firstly i need to allow only http and smtp services to the external netwrok, bcoz i have appache running on one of internal network . How do i do that????
secondly what does ESTABLISHED RELATED and NEW mean. i have been reading about this on the web and could hardly understand the need. can someone make me clear about this with example if possible.
Center for information and Netwrok Security