Thanks for both replies. The graphic does it a lot more understandable. Is there any way to debug iptables, I mean, like a tool where I can visualize the path of a packet and where exactly it gets dropped/accepted and also realtime packets headers (src, dst, proto, dport, sport, etc)? On Sat, Aug 25, 2012 at 12:56 PM, Corrado Primier <ilbardo@gmail.com> wrote:
2012/8/25 Juan Diego Tascón <juantascon@gmail.com>:
Good day,
Hello :)
I'm thinking of setting the default FORWARD policy to ACCEPT as my default INPUT policy is DROP and unless there is a valid FORWARD rule for a given port the packets wont go anywhere. I'm I right on this?
You're wrong. Either a packet goes through the INPUT chain or it goes through the FORWARD chain, depending on its destination. Take a look at this packet flow diagram: http://www.linuxhomenetworking.com/wiki/images/f/f0/Iptables.gif
Corrado