Error to restart network service in openstack

[jiten jha]

Dear Friends,

I have configured openstack cloud on 12.04 when I am restarting network
service than It is giving me error.

RTNETLINK answers: File exists
Fail to bring up eth1 .

vim /etc/network/interfaces

#The loopback network interface
auto lo
iface lo inet loopface

#The primary network interface
auto eth0
iface eth0 inet shcp

#Public interface
auto eth1
iface eth1 inet static
address 10.112.1.3
netmask 255.255.0.0
network 10.112.0.0
gateway 10.112.1.1
broadcast 10.112.255.255
#private interface
 auto eth2
iface eth2 inet manual
up ifconfig eth2 up

I have search on google but not getting any ans to solve that problem .
even i have install new os .

I am follow "openstack cloud computing cookbook".

Please help me to solve this problem.

-- 
Thanks & Regards
Jitendra Jha
+91-7498370550
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