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What you're asking is very easy to do. The file that you need to edit is /etc/network/interfaces.

If you're currently set to accept a DHCP address, you should change the line that reads

Code:

iface eth0 inet dhcp

to read

Code:

iface eth0 inet static

and then add any of these lines as appropriate to your system:

Code:

address X.X.X.X

netmask Y.Y.Y.Y

network Z.Z.Z.Z

broadcast A.A.A.A

gateway B.B.B.B

If it is an internal network, and all you need is an IP, then I think you can get away with just an address. Most times you will need at least an address, gateway, and subnet to get out on the internet. The network and broadcast ear easy to figure out, they are usually the lowest and highest addresses in your subnet.

Once all that is changed to how you like it, do

Code:

ifdown eth0

and then follow with

Code:

ifup eth0

and you'll have the new address activated.

Peace,
JimBass