Just installed my first CentOS 6.0 test server. In order to save bandwidth, I downloaded the minimal installation ISO which produced a Linux system that was able to boot correctly, but provided none of the standard system-config-... tools. So in order to continue installation, I had to setup IP information for the systems network card by manually editing files. This is a summary of the steps I followed.
Go to /etc/sysconfig/network-scripts/ and edit file ifcfg-eth0.
Then, make sure you provide the following keys
DEVICE=eth0 HWADDR=00:1f:29:c3:22:16 BOOTPROTO=static NM_CONTROLLED=yes ONBOOT=yes IPADDR=10.5.0.6 NETMASK=255.255.255.0
Open file /etc/sysconfig//network and add information for host name and
default gateway like this :
NETWORKING=yes HOSTNAME=barbara.shelman.int GATEWAY=10.5.0.1
The DNS servers are defined in /etc/resolv.conf. Typically the file
looks like this:
nameserver 10.5.1.1 nameserver 10.5.1.2
Network manager should pick up the changes immediately. In case it does
not, restart the netwrok service like this :
This is the minimal setup that worked for me. After I was able to set up my yum proxy and begin installation of CentOS packages, I was able to run system-config-network, which changed many of the previous entries. For example the gateway information in now stored in ifcfg-eth0, along with the DNS information. The previous setup however, is what go me started.