Proxmox privates LXC-Container-Netzwerk und Portweiterleitung

In /etc/network/interfaces einfügen und anpassen/ergänzen

auto vmbr1
iface vmbr1 inet static
  address 192.168.0.254
  netmask 255.255.255.0
  bridge_ports none
  bridge_stp off
  bridge_fd 0
  post-up echo 1 > /proc/sys/net/ipv4/ip_forward
  post-up iptables -t nat -A POSTROUTING -s '192.168.0.0/24' -o vmbr0 -j MASQUERADE
  post-down iptables -t nat -D POSTROUTING -s '192.168.0.0/24' -o vmbr0 -j MASQUERADE

  # VM-WEB
  # HTTP 80:192.168.0.1:80
  post-up iptables -t nat -A PREROUTING -i vmbr0 -p tcp --dport 80 -j DNAT --to 192.168.0.1:80
  post-down iptables -t nat -D PREROUTING -i vmbr0 -p tcp --dport 80 -j DNAT --to 192.168.0.1:80

Netzwerk-Reload ohne Neustart

systemctl restart networking