[CentOS] network interface question

[John R Pierce]

  On 10/13/10 3:26 PM, Paras pradhan wrote:
> Hi,
>
> I don't have ifcfg-eth1 in my /etc/sysconfig/network-scripts. But when
> I do ifconfig eth1 I can see output as below. If I do ifconfig eth12 ,
> I don't see anything which i am assume is normal.
>
>
> eth1      Link encap:Ethernet  HWaddr 00:24:E8:44:DB:CC
>            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:1000
>            RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)
>            Interrupt:17 Memory:e8000000-e8012800
>
>
> Don't know why and how this is happening.

Its unclear what your actual question is, but that behavior indicates 
that you have in fact an eth1 physical ethernet adapter but you haven't 
enabled or configured it (note there's no 'UP' or 'RUNNING' shown 
there).  you probably do not have an eth12 interface, hence why that 
gave no output.