On Wed, Jun 15, 2005 at 10:01:54PM +0200, Alexander Salmin wrote: > Hi, I guess this question is just a silly one for experts, but I can't > find the answer anywhere so I'm asking you guys. > > In what order do the assigned rules apply in this script? > > # Example1 > iptables -A INPUT -j DROP # rule #1 > iptables -A INPUT --dport 80 -j ACCEPT # rule #2 > > #Example2 > iptables -A INPUT --dport 80 -j ACCEPT # rule1 > iptables -A INPUT -j DROP # rule2 They apply in the order you've issued them since they are operating on INPUT and they are appending. > Will the both examples produce the same result? No; example1 drops everything to INPUT with rule 2 never being reached, but example2 would ACCEPT packets to port 80.. although wouldn't that be a syntax error without at least -p tcp or -p udp to tell it that it is something that has ports? > Or will rule2 in example 2 make rule1 in example2 vanish because it's > telling the system to drop all? No, rules don't affect other rules. They may not be reached however.
Attachment:
signature.asc
Description: Digital signature
