After adding some rules like:
sudo iptables -A INPUT -i lo -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 22 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 80 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 443 -j ACCEPT
sudo iptables -A INPUT -j DROP
in the containter (+ ip6tables rules), running iptables -L becomes very very slow.
Using ufw before never posed this kind of issue.
Is there a recommended firewall to be run in LXCs?