Useful iptables commands

Show iptables with line numbers

iptables -nL --line-numbers

-n – Numeric output. IP addresses and port numbers will be printed in numeric format.
-L – List all rules in the selected chain. If no chain is selected, all chains are listed.

Insert (add) rule in the specific place in iptables as it works descending

sudo iptables -I INPUT 9 -i eth0 -d 192.168.1.254 -j ACCEPT -m comment --comment "my new comment"

The number 9 means the rule is inserted at position 9 in the chain.

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