All technological notes.
Hands-on
apt install pve-esxi-import-tools -y
# pve-esxi-import-tools is already the newest version (0.7.3).
tar -xvf OL8-General.ova
qm importovf 300 OL8-General-disk1.ovf local-lvm --format raw
# can remove the ova and the files
iptables -t nat -F
iptables -F FORWARD
iptables -t nat -A POSTROUTING -s 192.168.100.1 -o wlp7s0 -j MASQUERADE
iptables -A FORWARD -s 192.168.100.1 -o wlp7s0 -j ACCEPT
iptables -A FORWARD -d 192.168.100.1 -m state --state ESTABLISHED,RELATED -i wlp7s0 -j ACCEPT