Linux – Static Network configuration with bridge in CentOS 6.2

centoscentos6linuxlinux-networkingnetworking

I have a server with CentOS 6.2 installed, I want to use it as a VM host to run some windows installations for development purposes. I wanted to be able to directly RDP and serve websites from IIS on these windows server installations, so I figured I would set it up as bridged networking.

I have been struggling with this all morning, usually the result being that when I brought up the bridge interface all network connectivity to the CentOS would go away, however, I think I finally have that all figured out. However, here's what happens.

The eth0 and br0 interfaces are defined in /etc/sysconfig/network-scripts with ifcfg-eth0 and ifcfg-br0. I DO NOT have ifup or ifdown or any other files for these interfaces, I have not found if they are needed. I can login and use firefox to browse the web, however, running ifconfig reveals that my eth0 does not have an IPAddress, but the br0 does. I can actually RDP into the Windows installation, and browse the internet from there as well, but I cannot directly connect(via putty, vnc, nor viewing web pages) to the CentOS box. Any idea what's up?

ifcfg-eth0

DEVICE=eth0
BOOTPROTO=none
IPADDR=192.168.1.20
GATEWAY=192.168.1.1
NETMASK=255.255.255.0
NETWORK=192.168.1.0
ONBOOT=yes
BRIDGE=br0

ifcfg-br0 

DEVICE=br0
TYPE=Bridge
BOOTPROTO=static
DNS1=192.168.1.1
DNS2=8.8.8.8
GATEWAY=192.168.1.1
IPADDR=192.168.1.2
NETMAS=255.255.255.0
ONBOOT=yes

I know some of the options are inconsistent (DNS and BOOTPROTO) because I tried changing those in the eth0 file to make it work, and the changes haven't adversly affected web browsing or the other functionality

Thank you!

Best Answer

remove the IP settings from the eth0, leave them only on the bridge. Also add DELAY=0 to the bridge's ifcfg script. This should make things work for you.

One additional thing - make sure you have the right HWADDR= line in the ifcfg for the eth.

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