update redhat dynamic IP to static IP   step1: add gateway       vi /etc/sysconfig/network       add below "GATEWAY" line  NETWORKING=yes  NETWORKING_IPV6=no  HOSTNAME=localhost.localdomain  GATEWAY=192.168.1.1    www.2cto.com   step2: add your new IP address        update dhcp to static,        add your ipaddr line        add your netmast line    DEVICE=eth0  #BOOTPROTO=dhcp  BOOTPROTO=static  HWADDR=00:CC:23:3A:C3:EF  IPADDR=192.168.1.200  NETMAST=255.255.255.0  ONBOOT=yes    step3: update name server  vi /etc/resolv.conf  nameserver x.y.z.p  (normal, below step won't need, cause it will automaticlly get your name server)    step4:verify the static ip config effect:  ifconfig eth0