debian 11.3

I've been hitting my head to the brick wall that is iptables inside a Debian 11.3 container in Proxmox. I cannot seem to get it to block anything and there seems to be some contradicting discussions about if iptables should even work inside LXC. I do use Proxmox firewall as well, and it is...

I want to install a Mellanox 10gbe network card, The driver will not install because the OS is 11, and needs to be 11.3 (tried the --force switch etc... and this revealed missing stuff - as expected I guess). So I thought I'd upgrade from Debian 11 to 11.3. What is the best way to do this, and...