Install iptables-persistent by entering the following commands in the terminal:
sudo apt update sudo apt install iptables-persistent
Description:
boot-time loader for netfilter rules, iptables plugin
netfilter-persistent is a loader for netfilter configuration using a plugin-based architecture. . This package contains the iptables and ip6tables plugins.
Version: 1.0.4+nmu2
Section: universe/admin