What do the words 'RELATED' and 'ESTABLISHED' individually signify in RELATED,ESTABLISHED state in iptables?
RELATED,ESTABLISHED state in iptables
iptables
RELATED - packets, which is new - but related to alredy established connection.For example - you send me message about football match results. I replayed to you, but send message about my new sweater. So - we both use skype (for example), at the same time. But - we spoke about different things. Best of all RELATED regarding to FTP protocol - it's opening few connections, but from host-to-host with same protocol type.ESTABLISHED - when we speak in same chat about same issue. Good example can be VPN - client opening connection to server, and packets move via this tunnel .And NEW one - when you I got sound alarm from my skype, which signals to me that I have new incoming message.