When my system boots up it shows the following message.

Bringing up loopback interface:  [  OK  ]
Bringing up interface eth0:  RTNETLINK answers: Invalid argument
[  OK  ]
Bringing up interface eth1:  RTNETLINK answers: Invalid argument
[  OK  ]
Bringing up interface eth2:  RTNETLINK answers: Invalid argument
[  OK  ]
Bringing up interface eth3:  RTNETLINK answers: Invalid argument
[  OK  ]

Why is this happening. Normally it does not give the message RTNETLINK answers: Invalid argument

I did ifconfig and the output is

eth0      Link encap:Ethernet  HWaddr 00:00:50:6D:56:B4  
          inet addr:120.0.10.137  Bcast:120.0.255.255  Mask:255.255.255.0
          inet6 addr: fe80::200:50ff:fe6d:56b4/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 b)  TX bytes:214 (214.0 b)
          Base address:0xa000 

eth1      Link encap:Ethernet  HWaddr 00:00:50:6D:56:B5  
          inet addr:121.0.10.137  Bcast:121.0.255.255  Mask:255.255.255.0
          inet6 addr: fe80::200:50ff:fe6d:56b5/64 Scope:Link
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 b)  TX bytes:214 (214.0 b)
          Base address:0xc000 

eth2      Link encap:Ethernet  HWaddr 00:00:50:6D:56:B6  
          inet addr:128.0.10.137  Bcast:128.0.255.255  Mask:255.255.255.0
          inet6 addr: fe80::200:50ff:fe6d:56b6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:14 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1006 (1006.0 b)  TX bytes:396 (396.0 b)
          Interrupt:16 

eth3      Link encap:Ethernet  HWaddr 00:00:50:6D:56:B7  
          inet addr:123.0.10.137  Bcast:123.0.255.255  Mask:255.255.255.0
          inet6 addr: fe80::200:50ff:fe6d:56b7/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:728 (728.0 b)  TX bytes:396 (396.0 b)
          Interrupt:17 

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:14 errors:0 dropped:0 overruns:0 frame:0
          TX packets:14 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:980 (980.0 b)  TX bytes:980 (980.0 b)

What could be the reason for the message and how to change this to normal?

Thanks