iptables nat ルールの削除

参考: https://www.cyberciti.biz/faq/how-to-iptables-delete-postrouting-rule/

$ sudo iptables -t nat -L --line-numbers

Chain PREROUTING (policy ACCEPT)
num  target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
num  target     prot opt source               destination
1    MASQUERADE  all  --  192.168.80.0/24      anywhere
2    MASQUERADE  all  --  192.168.50.0/24      anywhere

Chain OUTPUT (policy ACCEPT)
num  target     prot opt source               destination

↑ の num を指定する

$ sudo iptables -t nat -D POSTROUTING 1
OR
$ sudo iptables -t nat --delete POSTROUTING 1