I was recently running up a new CentOS6.4 64-bit minimal install on VMware vCenter v5 & vSphere client v5, and during the install of CentOS you can configure the networking manually, which I usually do for servers. This VM server has 2 VNICs, so I configured both manually and plugged in all the usual settings, static IP, default gateway etc., all very straight forward. On rebooting I noticed I had no networking at all, that’s odd I think.
I look at /etc/sysconfig/network-scripts/ifcfg-eth0 and eth1 and notice that the line ONBOOT is set at “NO”, so no wonder it wasn’t working, so simply change it to “YES” and you are good to go.
DEVICE=eth0 TYPE=Ethernet UUID=dfe0f2f3-ff34-41c4-b634-c06b32c4567 ONBOOT=yes <==== change to YES NM_CONTROLLED=no BOOTPROTO=none HWADDR=00:55:36:AF:52:15 IPADDR=192.168.1.50 PREFIX=16 GATEWAY=22.214.171.124 DNS1=126.96.36.199 DNS2=188.8.131.52 DOMAIN="local" DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System eth0"