[CentOS] network interface question

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.

Thanks!
Paras.