Network on Promox
root@vmi2453123:/etc/network# cat /etc/network/interfaces
auto lo
iface lo inet loopback
auto eno1
iface eno1 inet manual
auto eno2
iface eno2 inet manual
iface eno3 inet manual
iface eno4 inet manual
auto eth0
iface eth0 inet manual
auto vmbr0
iface vmbr0 inet static
address xxx.123.xx.xx/21
gateway xxx.123.xx.1
bridge-ports eth0
bridge-stp off
bridge-fd 0
bridge-vlan-aware yes
bridge-vids 2-4094
auto vmbr1
iface vmbr1 inet static
address 192.168.100.100
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 '192.168.100.0/24' -o vmbr0 -j MASQUERADE
post-down iptables -t nat -D POSTROUTING -s '192.168.100.0/24' -o vmbr0 -j MASQUERADE
post-up iptables -t nat -A PREROUTING -i vmbr0 -p tcp --dport 80 -j DNAT --to-destination 192.168.100.8:80
post-down iptables -t nat -D PREROUTING -i vmbr0 -p tcp --dport 80 -j DNAT --to-destination 192.168.100.8:80
source-directory /etc/network/interfaces.d
source-directory /run/network/interfaces.d
root@vmi2453123:/etc/network#