From the command line type: system-config-network
If it doesn’t work. use YUM to install it: yum install system-config-network
Tab to your network card – hit enter
Tab down and select Use DHCP
Tab down and select Ok – hit enter
Check you have received an IP address from DHCP.
Change directory to /etc – cd /etc
type: cat resolve.conf
Check the output for the correct DNS server assigned by DHCP.