How to verify the applied settings in Linux

To verify the settings or changes in the configuration, you can use the following commands

->ifconfig - to verify the IP address
->route -n to verify the default route
->netstat -nr to verify the default route
->cat /etc/resolv.conf to verify the DNS settings
->hostname to verify the computer hostname

How to apply the new settings in Linux

To apply the configuration that has been done, you must run the following:

For Redhat/Mandrake

#service network restart
or
#/etc/rc.d/init.d/network [startstoprestart]

For debian/Debian based Linux

#/etc/init.d/networking[startstoprestart]

For Hostname settings take effect, restart the whole operating system.

How to configure Gateway and Hostname in Redhat and Mandrake

Edit and save the the file using linux editor

location: /etc/sysconfig/network

Value:

Networking=YES
Hostname=redhatenterprise
Gateway=192.168.0.254