Specifications

It is a good idea to enable NAT in domain0 so that domU can access the public net. This way,

even wireless users can work around the Red Hat Virtualization wireless limitations. To do this,

you must modify the S99XenLaptopNAT file that resides in the /etc/rc3.d directory to reflect

the example below:

#!/bin/bash

# XenLaptopNAT Startup script for Xen on Laptops

# chkconfig: - 99 01

# description: Start NAT for Xen Laptops

# PATH=/usr/bin:/sbin:/bin:/usr/sbin

# export PATH

GATEWAYDEV=`ip route | grep default | awk {'print $5'}`

iptables -F

case "$1" in

start)

if test -z "$GATEWAYDEV"; then

echo "No gateway device found"

else

echo "Masquerading using $GATEWAYDEV"

/sbin/iptables -t nat -A POSTROUTING -o $GATEWAYDEV -j MASQUERADE

echo "Enabling IP forwarding"

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

echo "IP forwarding set to `cat /proc/sys/net/ipv4/ip_forward`"

echo "done."

;;

echo "Usage: $0 {start|restart|status}"

;;

esac

If you want to automatically have the network setup at boot time, you must create a softlink to

/etc/rc3.d/S99XenLaptopNAT

When modifying the modprobe.conf file, you must include these lines:

alias dummy0 dummy

options dummy numdummies=1

18. Starting Domains Automatically During System

Boot

Starting Domains Automatically During System Boot

You can configure your guests to start automatically when you boot the system. To do this, you

Chapter 18. Red Hat Virtualization Troubleshooting