Network configuration

[Rick Stevens]

Cherukuri Srinivasa Rao wrote:
>  
>  
> Hi all
>  
> Just begining with Redhat Linux
>  
> I am required to update the following mentioned information on the two 
> systems which are placed on the network.I have the root password and 
> visiting the data warehouse where these two systems are placed.So no 
> need of commands are required to log on to these systems remotely.The 
> following parameters are to be modified.
>  
> IP address
> Default gateway
> Netmask Information
>  
> No changes are required to hostname and domain name.
>  
> We have two Dell machines loaded with Redhat. About version, I am not 
> sure. Likely to be 8.
>  
> I was told that the file to be edited is /etc/sysconfig/neetwork.
>  
>  
> Pl make a note that GUI is not available and these changes are to be 
> made using CLI.
>  
> Pl try to help me by providing step  by step instructions.

If you want to change the hostname, edit the "/etc/sysconfig/network"
file and change the data in "HOSTNAME=".

If you wish to change the gateway, edit the "/etc/sysconfig/network"
file and change the data in "GATEWAY=".

To change the IP address or netmask, edit the
"/etc/sysconfig/network-scripts/ifcfg-eth0" file and change the data in
the "IPADDR=" or "NETMASK=" lines, depending on what you want to do.

NOTE: The only lines you must have in
/etc/sysconfig/network-scripts/ifcfg-ethx" files are:

DEVICE=
	This should contain the name of your network interface.  For
	ethernet cards, this should be "eth0" for the first ethernet
	card, "eth1" for the second, etc.  For dial-up, this will
	most likely be "ppp0".  NOTE: This should match the name of the
	file.  If you have multiple ethernet interfaces, you
	may have files such as "ifcfg-eth0", "ifcfg-eth1" and
	"ifcfg-eth2" in your /etc/sysconfig/network-scripts directory.
	The first one should have "DEVICE=eth0" in it, the second should
	have "DEVICE=eth1" in it and so on.

IPADDR=
	This should contain your desired IP address if you have
	"BOOTPROTO=static" set.  The line is not needed if you have
	"BOOTPROTO=dhcp" set.

NETMASK=
	This should contain your desired netmask if you have
	"BOOTPROTO=static" set.  It is not needed if you have
	"BOOTPROTO=dhcp" set.

BOOTPROTO=
	If "BOOTPROTO=static" is set, you're using a fixed IP address
	and you must fill in the "IPADDR=" and "NETMASK=" lines.  If
	you have "BOOTPROTO=dhcp" set, you're using DHCP and you don't
	need the "IPADDR=" or "NETMASK=" lines at all.

ONBOOT=
	If "ONBOOT=yes" is set, the network card is brought up at boot
	time.  If "ONBOOT=no" is set, the card is not brought up at boot
	and you'll need to manually start it with the "ifup eth0"
	command at some point.
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- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-     I.R.S.: We've got what it takes to take what you've got!       -
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