IP PUBLIC PROXMOX : 10.3.10.240 -----> vmbr0
IP PRIVATE VM : 10.7.10.0/24
IP PRIVATE GATEWAY : 10.7.10.100
1. Enter the proxmox web gui click on
Proxmox node --> System --> Network -->Create --> Linux Bride
in this config I use ip 10.7.10.100/24 on vmbr1 as a gateway for the VMs
auto vmbr0
iface vmbr0 inet static
address 10.3.10.240/24
gateway 10.3.10.1
bridge-ports ens18
bridge-stp off
bridge-fd 0
auto vmbr1
iface vmbr1 inet static
address 10.7.10.100/24
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 '10.7.10.0/24' -o vmbr0 -j MASQUERADE
post-down iptables -t nat -D POSTROUTING -s '10.7.10.0/24' -o vmbr0 -j MASQUERADE
2. To make the VM accessible via PUBLIC IP
iptables -t nat -A PREROUTING -p tcp -d 10.3.10.240 --dport 80 -i vmbr0 -j DNAT --to-destination 10.7.10.200:80
3. To make SSH service on the VM