How to list and delete IPtables

How to list and delete iptables

• To delete Input rules:
• iptables -L -n -v --line-number
• For example, if we want to delete the input rule that drops invalid packets, we can see that it's rule 3 of the INPUT chain. So we should run this command:
• iptables -D INPUT 3
• To delete POSTROUTING:
• iptables -t nat -L -n -v --line-number
• iptables -t nat -D POSTROUTING 2
• --------------- snip -----------
• • Chain POSTROUTING (policy ACCEPT 57 packets, 4044 bytes)
  • num   pkts bytes target     prot opt in     out     source               destination
  • 1      670 42596 SNAT       all  --  *      br2     0.0.0.0/0            0.0.0.0/0            to:172.30.13.90
  • 2        0     0 SNAT       tcp  --  *      *       0.0.0.0/0            192.168.1.254        tcp dpt:80 to:192.168.1.99
• ---------------snip ----------------
• The above place line 2 is deleted.

Command to list the IPtables:

• iptables -L -v
• iptables -L
• iptables -L -n  => For INPUT, FORWARD and OUTPUT-chains
• iptables -L -t nat
• iptables -t nat -L -n -v  -> to View nat rules
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