CentOS - Nov 2011 - Odd ethernet interface

Hello,

I have a CentOS 6 VM on a CentOS 6 host. This VM has two ethernet 
interfaces, eth0 and eth1. It was working nice. All of a sudden eth1 
stopped working as expected. Kernel started to give the message below:

kernel: udev: renamed network interface eth2 to eth2-eth1

There is no any eth2 or eth2-eth1 in /etc/sysconfig/network-scripts/. I 
really don't know where it is coming from.

config -a:

eth0      Link encap:Ethernet  HWaddr 52:54:00:E0:5A:C5
           inet addr:10.0.0.32  Bcast:10.255.255.255  Mask:255.255.255.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:8293 errors:0 dropped:0 overruns:0 frame:0
           TX packets:6440 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:831687 (812.1 KiB)  TX bytes:6358220 (6.0 MiB)

eth1      Link encap:Ethernet  HWaddr 52:54:00:B5:B6:D1
           inet addr:192.168.2.2  Bcast:192.168.2.255  Mask:255.255.255.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:20 errors:0 dropped:0 overruns:0 frame:0
           TX packets:11 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:934 (934.0 b)  TX bytes:462 (462.0 b)

eth2-eth1 Link encap:Ethernet  HWaddr 52:54:00:B5:B6:D1
           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)

lo        Link encap:Local Loopback
           inet addr:127.0.0.1  Mask:255.0.0.0
           UP LOOPBACK RUNNING  MTU:16436  Metric:1
           RX packets:37 errors:0 dropped:0 overruns:0 frame:0
           TX packets:37 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:3642 (3.5 KiB)  TX bytes:3642 (3.5 KiB)

And below is /etc/udev/rules.d/70-persistent-net.rules:

# net device () (custom name provided by external tool)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", 
ATTR{address}=="52:54:00:e0:5a:c5", ATTR{type}=="1",
KERNEL=="eth*",
NAME="eth0"

# net device ()
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", 
ATTR{address}=="52:54:00:b5:b6:d1", ATTR{type}=="1",
KERNEL=="eth*",
NAME="eth1"

Here is the relevant excerpt from the xml on the host:
<interface type='bridge'>
<mac address='52:54:00:e0:5a:c5'/>
<source bridge='br0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x03' function='0x0'/>
</interface>
<interface type='bridge'>
<mac address='52:54:00:b5:b6:d1'/>
<source bridge='br1'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x07' function='0x0'/>
</interface>

I really don't understand what is really going on. I would appreciate 
any help hint.

All the best.

Vreme: 11/05/2011 01:10 AM, Mufit Eribol pi?e:
> Hello,
>
> I have a CentOS 6 VM on a CentOS 6 host. This VM has two ethernet
> interfaces, eth0 and eth1. It was working nice. All of a sudden eth1
> stopped working as expected. Kernel started to give the message below:
>
> kernel: udev: renamed network interface eth2 to eth2-eth1
>
> There is no any eth2 or eth2-eth1 in /etc/sysconfig/network-scripts/. I
> really don't know where it is coming from.
Your eth1 is being automaticaly renamed to eth2-eth1 for some reason. 
Have you changed anything in config(s) connected to eth1?

Are name and device name in ifcfg-ethX consistent? Have you reshufled 
your configs and left loose end somewhere?

Do you maybe have NetworkManager still active?


-- 

Ljubomir Ljubojevic
(Love is in the Air)
PL Computers
Serbia, Europe

Google is the Mother, Google is the Father, and traceroute is your
trusty Spiderman...
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