Soluzione 1:
Se stai scrivendo script, è più facile da rimuovere per definizione:
Esempio:
Per aggiungere:
iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to 8080
Nota la -A ? significa aggiungere .
Per rimuovere:
iptables -t nat -D PREROUTING -p tcp --dport 80 -j REDIRECT --to 8080
Nota il -D ? significa cancella .
Soluzione 2:
Puoi utilizzare l'opzione -D di iptables per eliminare le regole dalle tue catene. Ad esempio
Per prima cosa elenca la catena da cui vuoi rimuovere una regola, usa --line-numbers
sudo iptables -L RH-Firewall-1-INPUT -n --line-numbers
Chain RH-Firewall-1-INPUT (2 references)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
2 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
3 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 255
4 ACCEPT esp -- 0.0.0.0/0 0.0.0.0/0
5 ACCEPT ah -- 0.0.0.0/0 0.0.0.0/0
6 ACCEPT udp -- 0.0.0.0/0 224.0.0.251 udp dpt:5353
7 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:631
8 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:631
9 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
10 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
11 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Per eliminare la riga 6
sudo iptables -D RH-Firewall-1-INPUT 6
sudo iptables -L RH-Firewall-1-INPUT -n --line-numbers
Chain RH-Firewall-1-INPUT (2 references)
num target prot opt source destination
1 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80
2 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
3 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 icmp type 255
4 ACCEPT esp -- 0.0.0.0/0 0.0.0.0/0
5 ACCEPT ah -- 0.0.0.0/0 0.0.0.0/0
6 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:631
7 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:631
8 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
9 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
10 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Se hai la configurazione di iptables salvata in un file, non dimenticare di aggiornare il file (iptables-save , service iptables save ecc.)
Soluzione 3:
http://linux.die.net/man/8/iptables:
ehm
iptables -L, --list [chain]
List all rules in the selected chain. If no chain is selected, all chains are listed. As every other iptables command, it applies to the specified table (filter is the default), so NAT rules get listed by
iptables -t nat -n -L
Please note that it is often used with the -n option, in order to avoid long reverse DNS lookups. It is legal to specify the -Z (zero) option as well, in which case the chain(s) will be atomically listed and zeroed. The exact output is affected by the other arguments given. The exact rules are suppressed until you use
iptables -L -v
...
iptables -D, --delete chain rule-specification
iptables -D, --delete chain rulenum
Delete one or more rules from the selected chain. There are two versions of this command: the rule can be specified as a number in the chain (starting at 1 for the first rule) or a rule to match.