All configuration has been done, but internet is not working in linux.

Solution: You must be need to Disable NetworkManager in Lniux

 edit this file
vi /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE="eth0"
NM_CONTROLLED="yes"
changed to NM_CONTROLLED="no"ONBOOT=yes
TYPE=Ethernet
BOOTPROTO=none
IPADDR=x.x.x.x
PREFIX=26
GATEWAY=x.x.x.x
DNS1=x.x.x.x
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
DOMAIN=180.179.199.60
HWADDR=98:4B:E1:67:37:6C
LAST_CONNECT=1339580954

save with :wq!
[root@localhost ~]# chkconfig --list | grep NetworkManager
NetworkManager  0:off   1:off   2:on    3:on    4:on    5:on    6:off