> > On 13/5/23 18:56, Tom Reed wrote: >> for iptables-save, after system rebooting, does it know where to locate >> the file? > > Yes. That's all taken care of by the iptables-persistent package > > Also I made a typo. correction; > > sudo nano /etc/iptables/rules.v4 > > sudo nano /etc/iptables/rules.v6 > That's all right. Thanks for helps. tom.