Hello,

Please use ethtool ethX and verify if link is detected or not.

Att.,

Rodrigo Kellermann Ferreira

On Sun, Sep 11, 2011 at 3:57 PM, Michael D. Berger < m_d_berger_1900@yahoo.com> wrote:

On my CentOS 6 partition of my laptop:

First note that for this test, NetworkManager is not running because I did: chkconfig --del NetworkManager and then rebooted.

Here is my ifcfg-eth0:

DEVICE="eth0" NM_CONTROLLED="no" ONBOOT=no HWADDR=xx:xx:xx:xx:xx:xx TYPE=Ethernet BOOTPROTO=none IPADDR=192.168.2.5 PREFIX=24 GATEWAY=192.168.2.1 DNS1=192.168.2.1 DNS2=192.168.2.1 DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System eth0" UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

I reboot to level3, do startx (to KDE 4) then do: # ifconfig eth0 up # ping 192.168.9.1 connect: Network is unreachable

If I edit ifcfg-eth0 to set ONBOOT=yes and reboot, I get a proper connection.

So why is "ifconfig eth0 up" not connecting?

Thanks for your help. Mike.

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CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos

11.09.2011 22:57, Michael D. Berger wrote:

On my CentOS 6 partition of my laptop:

First note that for this test, NetworkManager is not running because I did: chkconfig --del NetworkManager and then rebooted.

Here is my ifcfg-eth0:

DEVICE="eth0" NM_CONTROLLED="no" ONBOOT=no HWADDR=xx:xx:xx:xx:xx:xx TYPE=Ethernet BOOTPROTO=none IPADDR=192.168.2.5 PREFIX=24 GATEWAY=192.168.2.1 DNS1=192.168.2.1 DNS2=192.168.2.1 DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System eth0" UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

I reboot to level3, do startx (to KDE 4) then do: # ifconfig eth0 up # ping 192.168.9.1 connect: Network is unreachable

If I edit ifcfg-eth0 to set ONBOOT=yes and reboot, I get a proper connection.

So why is "ifconfig eth0 up" not connecting?

Thanks for your help. Mike.

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CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos

You should not use 'PREFIX=...' parameter if you prefer static network settings functionality provided by initscripts rather than NM daemon. I believe is is not honored by ifup* scripts and is not documented by el6 deployment guide either. Use 'NETMASK=...' instead and then issue the command 'ifup eth0' to bring your NIC up and running.