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Xen 4.1 guest config for monowall
Posted May 12, 2013

With serial console on "xm console".

Use generic-pc-serial image.

Patch vif-common.sh if you want to give your network interfaces useful names in dom0 -- see serverfault article.1

--- /etc/xen/scripts/vif-common.sh.orig 2013-04-19 04:34:08.000000000 -0700
+++ /etc/xen/scripts/vif-common.sh      2013-05-12 23:38:08.000000000 -0700
@@ -98,7 +98,9 @@
         vifname="${vifname}-emu"
         if [ "$command" == "add" ] && ! ip link show "$vifname" >&/dev/null
         then
+           ip link set "$dev" down
             do_or_die ip link set "$dev" name "$vifname"
+           ip link set "$vifname" up
         fi
         dev="$vifname"
     fi

Dedicate one of dom0's network interfaces to monowall's WAN interface to ensure your DHCP leases match the MAC addresses on the wire (this is necessary for Telus and presumably other ISPs too). See br1 below.

# /etc/network/interfaces
auto lo br0 br1

iface lo inet loopback

iface br0 inet static
  address 10.9.8.20
  netmask 255.255.255.0
  gateway 10.9.8.1
  bridge_ports eth0

iface br1 inet static
  address 0.0.0.0
  bridge_ports eth1
  post-up /sbin/ifconfig eth1 up hw ether fe:ff:ff:ff:ff:ff

Either reboot or run if-up br1.

In your guest config, use eth1's real mac address as vif_gw1's emulated mac address:

kernel = '/usr/lib/xen-4.1/boot/hvmloader'
builder = 'hvm'
memory = 128
device_model = '/usr/lib/xen-4.1/bin/qemu-dm'
vif = ['mac=2:3:4:5:6:7, bridge=br0, vifname=vif_gw0, type=ioemu', 'mac=co:py:fr:om:et:h1, bridge=br1, vifname=vif_gw1, type=ioemu']
disk = ['phy:/dev/mapper/vg0-gw--root,ioemu:hda,w']
boot = 'c'
serial = 'pty'
name = 'gw'
vcpus = 1

1 Otherwise you get:

Error: Device 0 (vif) could not be connected. ip link set vif10.0-emu name vif_gw0-emu failed