iptables can be saved or loaded from a file. Here’s a way to do it.
Saving to a file
# Debian/Ubuntu iptables-save > /etc/iptables/rules.v4 # Redhat/Centos/Rocky iptables-save > /etc/sysconfig/iptables |
Loading from a file
# Debian/Ubuntu iptables-restore > /etc/iptables/rules.v4 # Redhat/Centos/Rocky iptables-restore > /etc/sysconfig/iptables |
Listing rules
iptables -L |