sudo iptables -L                                       # list
sudo iptables -t nat -L -v                             # list nat table

sudo iptables -A FORWARD -i wg0 -o wg0 -j ACCEPT       # ans Ende der chain (append)
sudo iptables -I FORWARD -i wg0 -o wg0 -j ACCEPT       # an den Anfand der Chain
sudo iptables -I 4 FORWARD -i wg0 -o wg0 -j ACCEPT     # an 4. Stelle der Chain

sudo iptables -t nat -v -L -n --line-number            # list nat table rules numbered
sudo iptables -t nat -D POSTROUTING 6                  # delete rule from nat table in chain POSTROUTING number 6