Xen project Mailing List

On Wed, Jan 25, 2012 at 12:50 PM, Bryan Emmanuel <piusvelte@xxxxxxxxx> wrote:

All,

I'm trying to resolve the network bridging my on laptop. I've recently installed Debian Squeeze 64bit with Xen 4.0. As I'm on a laptop and switch between eth0 and wlan0 for my connection, I've setup a dummy interface and setup xen to bridge using that, yet my first virtual machine does not have internet connectivity. Here are more details:

/etc/network/interfaces

auto lo
iface lo inet loopback

allow-hotplug eth0

allow-hotplug wlan0

auto dummy0
iface dummy0 inet static
address 192.168.101.1
netmask 255.255.255.0

######
/etc/modules

loop
alias dummy0 dummy

######
/etc/network/if-up.d/iptables

#!/bin/bash
echo "Interface up, begin iptable setup"
GATEWAYDEV=`ip route | grep default | awk {'print $5'}`

if test -z "$GATEWAYDEV"; then
echo "No gateway device found"
else
# iptables-save to view all iptables info

echo "Delete existing POSTROUTING chains"
iptables -D POSTROUTING -t nat -o wlan0 -s 192.168.101.0/24 -j MASQUERADE

iptables -D POSTROUTING -t nat -o eth0 -s 192.168.101.0/24 -j MASQUERADE
echo "Maquerading using $GATEWAYDEV"

iptables -A POSTROUTING -t nat -o $GATEWAYDEV -s 192.168.101.0/24 -j MASQUERADE
fi
echo "Enabling IP forwarding"

echo "1" > /proc/sys/net/ipv4/ip_forward
echo "Done"

######
/etc/xen/xend-config.sxp

(network-script 'network-bridge bridge=xenbr0 netdev=dummy0')

(vif-script vif-bridge)

######
My hvm was created using convirt and is configured to use the xenbr0:

vif=['mac=00:16:3e:59:27:b8,bridge=xenbr0']

######
Here's the output from iptables-save with the virtual machine running...

# Generated by iptables-save v1.4.8 on Wed Jan 25 12:46:47 2012
*filter
:INPUT ACCEPT [1659:13129323]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [1055:13036380]
-A FORWARD -m state --state RELATED,ESTABLISHED -m physdev --physdev-out vif1.0 -j ACCEPT

-A FORWARD -m physdev --physdev-in vif1.0 -j ACCEPT
COMMIT
# Completed on Wed Jan 25 12:46:47 2012
# Generated by iptables-save v1.4.8 on Wed Jan 25 12:46:47 2012
*nat
:PREROUTING ACCEPT [73457:13273698]
:POSTROUTING ACCEPT [2201:213665]
:OUTPUT ACCEPT [2201:213665]
-A POSTROUTING -s 192.168.101.0/24 -o eth0 -j MASQUERADE

COMMIT
# Completed on Wed Jan 25 12:46:47 2012

######
...and brctl show...

xenbr0 8000.4ed134c56d80 no pdummy0

######
The hvm guest is Windows 7 64bit, and shows no network connection.

What am I missing, or should I check to resolve the lack of network connection?

Thank you!
Bryan

Re: [Xen-users] Xen on a laptop