[Xen-users] ip autoconfig via DIY script

[Mark Pryor <tlviewer@xxxxxxxxx>]

Hello,

Do I really need this hack?

I have a PV xen 4.1 domU. I want to use IP auto config.

In my xm config, I insert
------------------- xm config ----------

ip='10.0.2.5'
gateway='10.0.2.2'
server='127.0.255.255'
netmask='255.255.255.0'
hostname='natmin'
interface='eth0'
dhcp='off'
------------------ snip ---------------

None of the kernels I use have
CONFIG_IP_PNP

however the running domU has proc/cmdline with
   ip=10.0.2.5:127.0.255.255:10.0.2.2:255.255.255.0:natmin:eth0:off

if I have no config for eth0 in /etc/network/interfaces, I can use this script 
in 

domU /etc/rc.local to setup the domU network via domU


-------------------------- /etc/rc.local --------------
SCM=$(cat /proc/cmdline| grep -Po 'ip.*dhcp')
#echo ${#SCM} is len

# try dhcp first

if [ ${#SCM} -gt 0 ]; then
echo launching dhcp
dhclient eth0
fi

echo trying static
SCM=$(cat /proc/cmdline| grep -Po 'ip.*off')

# check cmdline for ip autoconfig
if [ ${#SCM} -gt 0 ]; then

SCM=${SCM#ip\=}
SCM=$(echo  $SCM | sed 's/:/ /g')

#${SCM//\:/\ }
j=0
for i in $SCM; do

echo  $i $j

case $j in
0)
     MIP=$i;;
1)
     echo ;;
2)
    MGATE=$i;;
3)
    MMASK=$i;;
4)
    MHOST=$i;;
5)
    MINT=$i;;

esac
j=$((j+1))
done

/sbin/ifconfig -a $MINT $MIP netmask $MMASK  up

sleep 1
/sbin/route add default gw $MGATE
echo $MHOST > /etc/hostname

fi


sleep 2
wget --spider http://192.168.1.1/favicon.ico?xendomU
exit 0


------------------------- snip ------------

-- 

Mark

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