Delete all ufw chains in Ubuntu iptables

Aug 8, 2023#Linux #Ubuntu #ufw #防火墙42

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Usually, when we uninstall ufw using apt, there are still ufw chains left in iptables. This affects the appearance. To remove all ufw chains, use the provided commands. After executing these commands, the appearance will be improved.

Usually, we directly uninstall ufw with apt, but there are still a bunch of ufw chains left in iptables.

Affects the aesthetics.
Only the following 4 commands are needed to delete all ufw chains:

for i in `iptables -L INPUT --line-numbers |grep '[0-9].*ufw' | cut -f 1 -d ' ' | sort -r `; do iptables -D INPUT $i ; done

for i in `iptables -L FORWARD --line-numbers |grep '[0-9].*ufw' | cut -f 1 -d ' ' | sort -r `; do iptables -D FORWARD $i ; done

for i in `iptables -L OUTPUT --line-numbers |grep '[0-9].*ufw' | cut -f 1 -d ' ' | sort -r `; do iptables -D OUTPUT $i ; done

for i in `iptables -L | grep 'Chain .*ufw' | cut -d ' ' -f 2`; do iptables -X $i ; done

iptables-save

Feels much better.

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The original link is https://blog.nekorua.com/posts/maintain/49.html