How to configure IP Address.

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command: system-config-network

Once if ip address is set, restart the network service
 service network restart

How to verify IP Address of our machine
 # ifconfig
 # ip addr show eth0

How to activate ethernet device:    ifup eth0
How to deactivate ethernet device:  ifdown eth0

Configuration file for 'eth0' device:
 /etc/sysconfig/network-scripts/ifcfg-eth0
 DEVICE=eth0
 BOOTPROTO=static
 HWADDR=00:0c:29:66:73:a8
 ONBOOT=yes
 IPADDR=192.168.42.100
 NETMASK=255.255.255.0

ping: To check wether the machine is accessable or not
 ping 192.168.42.100

hostname: shows the hostname of ur server
 # hostname

 To change hostname temporarily
 # hostname server.example.com

/etc/hosts: Location in our machine where hostnames are resolved. We can add all hostnames in this file as follows:
192.168.42.100 server.example.com server
192.168.42.200 client.example.com client

/etc/resolv.conf: this is the file where DNS server IP is set
search example.com
nameserver 192.168.42.127


hostname -i: to view ipaddress of a machine.(works only when entry in 'hosts' file or in DNS server

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