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VLAN tagging on Linux for KVM

Today, I’m going to explain my config for KVM server to get network connectivity on guests machines using tagged vlans to get independent networks. As virtual platform I am using Proxmox ve. Proxmox is a great platform to administer KVM and OpenVZ machines, actually it is based on Debian Lenny, but very soon will be available the 2.0 version based on Debian Squeeze and with many great features.

I have connected my kvm server network interfaces to two different switches and the switch ports configured in trunk mode only accepting traffic for my tagged vlans. For vlan configuration I am using vlan package in debian, rather than specify them like eth0.X, I prefer to configure them using this tool.

To install vlan package simply run:

 # apt-get install vlan

Above the two network interfaces I have configured a bond interface in active-backup mode. My /etc/network/interfaces file looks like this:

iface eth0 inet manual
iface eth1 inet manual

auto bond0
iface bond0 inet manual
        slaves eth0 eth1
        bond_miimon 100
        bond_mode active-backup

auto vlan50
iface vlan50 inet manual
        vlan_raw_device bond0

auto vlan60
iface vlan60 inet manual
       vlan_raw_device bond0

auto vlan100
iface vlan100 inet manual
       vlan_raw_device bond0

auto vmbr0
iface vmbr0 inet static
        bridge_ports vlan100
        bridge_stp off
        bridge_fd 0

auto vmbr50
iface vmbr50 inet static
        bridge_ports vlan50
        bridge_stp off
        bridge_fd 0

auto vmbr60
iface vmbr60 inet static
        bridge_ports vlan60
        bridge_stp off
        bridge_fd 0

I have three bridges configured, vmbr0 (with vlan 100), required to access proxmox web interface, and vmbr50 and vmbr60, each of them accessing to their vlans to provide access to guests. The bridge vmbr0 is the only bridge that has an IP address configured, because is the only interface I’m going to use to access to the kvm server.

Now, it is easy to provide network connectivity to the kvm guests machines, simply you have to link their network interfaces to the bridge you want depending on, to that vlan you want they get access.

For example, part of one of my kvm machine config file looks like this:

vlan60: virtio=DE:17:7C:C3:CE:B2
vlan50: virtio=B2:0A:19:3E:72:4D

This is automatically added using proxmox ve web interface.

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