+The installation program creates a single bridge named `vmbr0`, which
+is connected to the first ethernet card `eth0`. The corresponding
+configuration in '/etc/network/interfaces' looks like this:
+
+----
+auto lo
+iface lo inet loopback
+
+iface eth0 inet manual
+
+auto vmbr0
+iface vmbr0 inet static
+ address 192.168.10.2
+ netmask 255.255.255.0
+ gateway 192.168.10.1
+ bridge_ports eth0
+ bridge_stp off
+ bridge_fd 0
+----
+
+Virtual machines behave as if they were directly connected to the
+physical network. The network, in turn, sees each virtual machine as
+having its own MAC, even though there is only one network cable
+connecting all of these VMs to the network.
+
+
+Routed Configuration
+~~~~~~~~~~~~~~~~~~~~
+
+Most hosting providers do not support the above setup. For security
+reasons, they disable networking as soon as they detect multiple MAC
+addresses on a single interface.
+
+TIP: Some providers allows you to register additional MACs on there
+management interface. This avoids the problem, but is clumsy to
+configure because you need to register a MAC for each of your VMs.
+
+You can avoid the problem by "routing" all traffic via a single
+interface. This makes sure that all network packets use the same MAC
+address.
+
+A common scenario is that you have a public IP (assume 192.168.10.2
+for this example), and an additional IP block for your VMs
+(10.10.10.1/255.255.255.0). We recommend the following setup for such
+situations:
+
+----
+auto lo
+iface lo inet loopback
+
+auto eth0
+iface eth0 inet static
+ address 192.168.10.2
+ netmask 255.255.255.0
+ gateway 192.168.10.1
+ post-up echo 1 > /proc/sys/net/ipv4/conf/eth0/proxy_arp
+
+
+auto vmbr0
+iface vmbr0 inet static
+ address 10.10.10.1
+ netmask 255.255.255.0
+ bridge_ports none
+ bridge_stp off
+ bridge_fd 0
+----
+
+
+Masquerading (NAT) with iptables
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+In some cases you may want to use private IPs behind your Proxmox
+host's true IP, and masquerade the traffic using NAT:
+
+----
+auto lo
+iface lo inet loopback
+
+auto eth0
+#real IP adress
+iface eth0 inet static
+ address 192.168.10.2
+ netmask 255.255.255.0
+ gateway 192.168.10.1
+
+auto vmbr0
+#private sub network
+iface vmbr0 inet static
+ address 10.10.10.1
+ 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 '10.10.10.0/24' -o eth0 -j MASQUERADE
+ post-down iptables -t nat -D POSTROUTING -s '10.10.10.0/24' -o eth0 -j MASQUERADE
+----
+
+////
+TODO: explain IPv6 support?
+TODO: explan OVS
+////
+
+
+////
+TODO: