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networking - Static virtual IP in debian 6.0.4

In debian 6.0.4 my static ip is 192.168.1.151 and I want to add one more ip 192.168.1.175 as virtual ip. For did I made following changes in /etc/networking/interfaces 



# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback


# The primary network interface
allow-hotplug eth0
#NetworkManager#iface eth0 inet dhcp

auto eth0

    iface eth0 inet static
        address 192.168.1.151
        gateway 192.168.1.1

        netmask 255.255.255.0
        network 192.168.1.0
        broadcast 192.168.1.255

auto eth0:0
    iface eth0:0 inet static
        address 192.168.1.175
        netmask 255.255.255.0
        broadcast 192.168.1.255
        gateway 192.168.1.1



And when I run command 

/sbin/ifconfig -a

I get the below information

eth0      Link encap:Ethernet  HWaddr 44:87:fc:eb:b2:50  
          inet addr:192.168.1.151  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::4687:fcff:feeb:b250/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:338433 errors:0 dropped:0 overruns:0 frame:0
          TX packets:238153 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000 
          RX bytes:337480876 (321.8 MiB)  TX bytes:68577550 (65.4 MiB)
          Interrupt:25 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:3735 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3735 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:0 
          RX bytes:494269 (482.6 KiB)  TX bytes:494269 (482.6 KiB)

pan0      Link encap:Ethernet  HWaddr 16:56:67:bf:36:84  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)



Mostly I get this but some time i get the virtual ip in the output. I have to make virtual ip permanent. How can i do that? Also I will assign this virtual ip (192.168.1.175) to two machine.



Thanks

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