[CentOS] network interface question

Paras pradhan pradhanparas at gmail.com
Wed Oct 13 18:39:30 EDT 2010


I have eight nics as below

[ppradhan at cvprd1 ~]$ ./lshw -short -class network
WARNING: you should run this program as super-user.
H/W path            Device           Class      Description
===========================================================
/0/100/4/0/0        eth4             network    NetXtreme II BCM5708
Gigabit Ethernet
/0/100/5/0/0        eth1             network    NetXtreme II BCM5708
Gigabit Ethernet
/0/100/9/0/0        eth6             network    NetXtreme II BCM5708
Gigabit Ethernet
/0/100/a/0/0        eth7             network    NetXtreme II BCM5708
Gigabit Ethernet
/0/100/c/0/2/0      __tmp1035166962  network    82575GB Gigabit
Network Connection
/0/100/c/0/2/0.1    eth5             network    82575GB Gigabit
Network Connection
/0/100/c/0/4/0      __tmp619132850   network    82575GB Gigabit
Network Connection
/0/100/c/0/4/0.1    __tmp1445504961  network    82575GB Gigabit
Network Connection


On that only eth4, eth6 and eth7 are configured ( or have ifcfg-eth4 ,
ifcfg-eth6 and ifcfg-eth7) . Wondering why there is eth1 and eth5 and
also _tmp*

Thanks!
Paras.




On Wed, Oct 13, 2010 at 5:33 PM, Jacob Bresciani <jacob at aers.ca> wrote:
> eth1 exists because the /dev device was found on boot (you have 2 or more
> network interfaces).
> eth12 does due to you not have 13+ nic's or did not map a network device to
> be eth12.
>
> On Wed, Oct 13, 2010 at 3:26 PM, Paras pradhan <pradhanparas at gmail.com>
> 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.
>>
>> Thanks!
>> Paras.
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>
>
>
> --
> Jacob Bresciani
> Linux Systems Administrator
> Advanced Ecommerce Research Systems / Terapeak
> Cell: 250 418-5412
>
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