Packet filtering in linux
Hi guys! I am attempting to build an open source firewall in linux and I need to know how to filter packets WITHOUT using iptables. Once a packet is inspected a decision is made whether it should be dropped or not. Now to drop the packet I need to stop it from entering the kernel in the first place otherwise it would be forwarded automatically.
How do i do that? Is it possible using netfilter?
Reply will be highly appreciated.
Thanx in advance :)