On a standard Ubuntu server have I done
vi /etc/sysctl.conf did I enable
iptables -t nat -A POSTROUTING -j MASQUERADE sysctl -p /etc/sysctl.conf
but what I wanted to do was
iptables-save > /etc/iptables.up.rules
iptables-save have overridden the default iptables rules, which was not what I wanted.
How do I undo that?