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Created: 2022-04-22 | Last update: 2022-04-24

Proxmox Networking

Official Proxmox networking documentation can be found here.

Basics

Proxmox network configuration file location
/etc/network/interfaces
Restart proxmox network service to apply changes
systemctl restart networking.service

Example of Multi Network Interface Server

The next examples will be based on the following network nics, ip addr output:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: enp7s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 18:c0:4d:00:9f:b7 brd ff:ff:ff:ff:ff:ff
3: enp6s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 18:c0:4d:00:9f:b9 brd ff:ff:ff:ff:ff:ff
4: enp12s0f4: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master vmbr0 state UP group default qlen 1000
    link/ether 00:07:43:29:42:c0 brd ff:ff:ff:ff:ff:ff
5: enp12s0f4d1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 00:07:43:29:42:c8 brd ff:ff:ff:ff:ff:ff
6: enp12s0f4d2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 00:07:43:29:42:d0 brd ff:ff:ff:ff:ff:ff
7: enp12s0f4d3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 00:07:43:29:42:d8 brd ff:ff:ff:ff:ff:ff
8: wlp5s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 8c:c6:81:f0:a6:9a brd ff:ff:ff:ff:ff:ff
9: vmbr0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 00:07:43:29:42:c0 brd ff:ff:ff:ff:ff:ff
    inet 192.168.100.12/24 scope global vmbr0
       valid_lft forever preferred_lft forever

In order Identify physical network interfaces corresponding to Network Interfaces name in Proxmox you can follow this guide

Breakdown of the ip addr output:

  1. lo is a loopback interface.
  2. enp7s0 is a 2.5G network interface.
  3. enp6s0 is a 1G network interface.
  4. enp12s0f4 is a 10G network interface.
  5. enp12s0f4d1 is a 10G network interface.
  6. enp12s0f4d2 is a 10G network interface.
  7. enp12s0f4d3 is a 10G network interface.
  8. wlp5s0 is a Wifi network interface
  9. vmbr0 is a bridge interface.

The content of the /etc/network/interfaces after fresh installation:

auto lo
iface lo inet loopback

iface enp12s0f4 inet manual

auto vmbr0
iface vmbr0 inet static
    address 192.168.100.12/24
    gateway 192.168.100.1
    bridge-ports enp12s0f4
    bridge-stp off
    bridge-fd 0

iface enp7s0 inet manual

iface enp6s0 inet manual

iface enp12s0f4d1 inet manual

iface enp12s0f4d2 inet manual

iface enp12s0f4d3 inet manual

iface wlp5s0 inet manual

Info

vmbr0 is a bridge interface. It's used to provision network to virtual machines and containers on Proxmox VE Server. We can assign multiple network interfaces to the bridge interface with bridge-ports option.

Static IP Bridge Configuration

The following example shows a static IP configuration vmbr0 bridge interface, including two network interfaces enp12s0f4 and enp7s0.

auto vmbr0
iface vmbr0 inet static
           address 192.168.100.12/24
           gateway 192.168.100.1
           bridge-ports enp12s0f4 enp7s0
           bridge-stp off
           bridge-fd 0

Configuring multi network interfaces to the bridge interface will provide you a failover behavior when the network interface is down or disconnected - for example, when specific switch is down.

Static IP Bridge with VLAN Aware Configuration

The following example shows a static IP as above but with VLAN Aware bridge.

auto vmbr0
iface vmbr0 inet static
           address 192.168.100.12/24
           gateway 192.168.100.1
           bridge-ports enp12s0f4 enp7s0
           bridge-stp off
           bridge-fd 0
           bridge-vlan-aware yes
           bridge-vids 2-4094

DHCP Bridge Configuration

The following example shows a DHCP configuration vmbr0 bridge interface, including two network interfaces enp12s0f4 and enp7s0.

auto vmbr0
iface vmbr0 inet dhcp
           bridge-ports enp12s0f4 enp7s0
           bridge-stp off
           bridge-fd 0

DHCP Bridge with VLAN Aware Configuration

The following example shows a DHCP as above but with VLAN Aware bridge.

auto vmbr0
iface vmbr0 inet dhcp
           bridge-ports enp12s0f4 enp7s0
           bridge-stp off
           bridge-fd 0
           bridge-vlan-aware yes
           bridge-vids 2-4094

Peronsal Network Configuration

Here's a sample of the /etc/network/interfaces file for a personal network:

auto lo
iface lo inet loopback

auto vmbr0
iface vmbr0 inet dhcp
           bridge-ports enp12s0f4 enp12s0f4d1 enp12s0f4d2 enp12s0f4d3 enp7s0
           bridge-stp off
           bridge-fd 0
           bridge-vlan-aware yes
           bridge-vids 2-4094

iface enp12s0f4 inet manual

iface enp12s0f4d1 inet manual

iface enp12s0f4d2 inet manual

iface enp12s0f4d3 inet manual

iface enp7s0 inet manual

iface enp6s0 inet manual

iface wlp5s0 inet manual

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