[SOLVED] Seting up second NIC / Bridge


New Member
Nov 5, 2019
Hi all,
I am new to Proxmox /coming from Vsphere/ and want to setup 2 separate Bridges on two physical NICs.

First NIC /10G Mellanox/ - vmbr0 - local LAN VMs /bridge IP - working fine, have 4 VMs with local IPs + its management network
Second NIC /onboard 1G Realtek/ - vmbr1 - external static IPs for VMs / connecting to Hitron ISP router in bridge mode
Third NIC - future addon vmbr2, need similar config as vmbr1 - external static IPs in this bridge for VMs

My config for first bridge /Proxmox 6.09/ :

auto vmbr0
iface vmbr0 inet static
bridge-ports enp3s0
bridge-stp off
bridge-fd 0

I have trouble setting up second bridge /and later third/. When I setup second bridge and set static IP / in VM on vmbr1, its internal network interface is always DOWN. There should be VMs with static IPs /I have 4 IPs from my ISP/ reachable directly from internet on vmbr1. How to configure vmbr1 IP/gateway ? I need both bridges be able to connect to internet.

Anybody can help me setup second/third NIC/bridge - like model config for vmbr1 ?

Thanks for your help and effort.

Hi, sorry for late reply, was busy in RL. I finaly found my stupid ERROR - syntax in interfaces config inside VMs on vmbr1 / i put "=" sign after address - like address =

Testing other VMs. Consider this post solved. Still learning how to work with networks on Proxmox. Will test new Nakivo 9.1 backup with native Linux server backup /using SSH/ as I could not find any reliable and also free/cheap backup solution for Proxmox VMs outside simple internal backup feature.
cat /etc/network/interfaces

auto lo
iface lo inet loopback

iface enp3s0 inet manual

iface enp6s0 inet manual

auto vmbr0
iface vmbr0 inet static
bridge-ports enp3s0
bridge-stp off
bridge-fd 0

auto vmbr1
iface vmbr1 inet manual
bridge-ports enp6s0
bridge-stp off
bridge-fd 0

I have some VMs including Seafile file sync server running as VMs on vmbr1 bridge.
Config and IP address of VM network interface on vmbr1:

allow-hotplug ens18
auto ens18
iface ens18 inet static
address = ---- >>> WRONG SYNTAX, should not include "="
.... etc ...

Consider this post solved. Tx for your time.


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