# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
# IS NO LONGER IN USE, see xenbr0
#allow-hotplug eth0
#iface eth0 inet dhcp

# Create a dummy interface to use with a "local-only" 
# bridge to use for domU-to-domU pure local traffic
auto dummy0
iface dummy0 inet manual
         pre-up ifconfig $IFACE up
         post-down ifconfig $IFACE down

# Bring up eth1, but with no address configuration
# eth1 will be used later as a bridge-port interface.
auto eth1
iface eth1 inet manual
	pre-up ifconfig $IFACE up
	post-down ifconfig $IFACE down

# VLAN CREATION
# Creating VLANs has become a lot better in Wheezy.
# All that is needed to create a VLAN subinterface now,
# is to add a stanza for a ethX.Y subinterface. Y becomes
# the VLAN ID.

# Adding VLANs tagged on eth1. These are simply
# brought up, they will be added as bridge-ports later.
auto eth1.2
iface eth1.2 inet manual
	pre-up ifconfig $IFACE up
	post-down ifconfig $IFACE down

auto eth1.3
iface eth1.3 inet manual
	pre-up ifconfig $IFACE up
	post-down ifconfig $IFACE down

auto eth1.4
iface eth1.4 inet manual
	pre-up ifconfig $IFACE up
	post-down ifconfig $IFACE down

auto eth1.5
iface eth1.5 inet manual
	pre-up ifconfig $IFACE up
	post-down ifconfig $IFACE down


# BRIDGES
# In my setup, I chose to use the "common or default" naming
# scheme for the two first bridges created for Xen use,
# xenbr0 and xenbr1. Then I added a pure-local bridge,
# and finally, I added bridges for VLANs that are used tagged.
# For the VLANs, I used 'vlanX' as bridge-name, as this is far
# more descriptive in the domU-configs than "xenbr143"

# xenbr0 is tied to eth0, and in my setup it is actually using DHCP for address
# allocation. In my network, the address given to xenbr0 is locked down
# on the DHCP-server side..
auto xenbr0
iface xenbr0 inet dhcp
        bridge_ports eth0

# Add the bridge for pure local-only communication between
# domU's. Just for fun, I'm setting an IP on this interface..
auto xenlocal
iface xenlocal inet static
        bridge_ports dummy0
       	address 192.168.127.2
	netmask 255.255.255.0
	bridge_stp off

# xenbr1 is tied to eth1 natively. eth1 is also used for tagged VLANs, those
# have separate eth1.X definitions above, and separate vlanX bridges below. I'm
# not using any IP addressing on eth1
auto xenbr1
iface xenbr1 inet manual
        bridge_ports eth1
        bridge_stp on
	bridge_maxwait 0

# None of the interfaces below have IP addresses assigned. Any domU hosts using
# these are not supposed to use the bridge for direct communication with dom0,
# there is an IP on xenbr0, so there is no deed for one on the VLANs

# The configuration for the VLANs is very repetitive: An 'auto' line to make
# sure the interface comes up automagically, an 'iface' line setting the bridge
# name and defining it to 'manual' configuration, definition of the VLAN
# subinterface of eth1, and finally setting Spanning Tree to 'on'.
# If even more control over the bridge interfaces is needed, man 5 bridge-utils-interfaces

auto vlan2
iface vlan2 inet manual
	bridge_ports eth1.2
	bridge_stp on
	bridge_maxwait 0

auto vlan3
iface vlan3 inet manual
	bridge_ports eth1.3
	bridge_stp on
	bridge_maxwait 0

auto vlan4
iface vlan4 inet manual
	bridge_ports eth1.4
	bridge_stp on
	bridge_maxwait 0

auto vlan5
iface vlan5 inet manual
	bridge_ports eth1.5
	bridge_stp on
	bridge_maxwait 0