Franchement pas d'accord avec lui t_t
Bon ya aussi de bons conseil dans l'article, alors je lui pardonne !
"Consider a situation where your INPUT chain contains quite a few rules allowing traffic, and you’ve set the default policy to DROP. Later on, another administrator logs into the server and flushes the rules (which isn’t a good practice, either). I’ve met quite a few good systems administrators who are unaware of the default policy for iptables chains. Your server will be completely inaccessible immediately. All of the packets will be dropped since they match the default policy in the chain."