After installing RHEL 6 you may not be able to get network connection up on booting the machine. This is a reported bug in RHEL 6. Follow below steps to solve the issue. Edit /etc/sysconfig/network-scripts/ifcfg-eth0 file, which is your default first NIC configuration file. If you are using DHCP server: Edit below file and change as given below #vi /etc/sysconfig/network-scripts/ifcfg-eth0 ONBOOT="yes" BOOTPROTO="dhcp" Save & restart networking service, #service network restart If you are providing manual IP: Edit below file and change as given below #vi /etc/sysconfig/network-scripts/ifcfg-eth0 DEVICE=eth0 IPADDR=192.10.110.10 NETMASK=255.255.255.0 NETWORK=10.10.10.0 GATEWAY=192.9.110.253 ONBOOT=yes BOOTPROTO=none USERCTL=no Save & restart networking service, #service network restart
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