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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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