If you are a Network Administrator some time you need to assign more than ONE ip address (second ipaddress) to your network card of Ubuntu machine. For this you need to edit the /etc/network/interfaces file by adding the following lines . See the example below and make change according to your ip address settings

ARP (Address Resolution Protocol) is a protocol used in local area networks (LAN).If a computer needs to send a packet to another machine within the same local network, the IP address and MAC address (Media Access Control) related to the network card on the receiving machine determine the allocation.

I thought it would be handy if I could come up with a script to keep track of my current IP address for me. The first step is to find out my current IP address. In my case, I have a SpeedStream 5100 DSL modem. The address of the modem on the local network is 192.168.0.1 and entering that address into a web browser will bring up a page that looks like this.

One of the most frustrating problems a network administrator can come across is an IP address conflict, when two or more machines on a network try to use the same IP. It's frustrating because it's a difficult problem to detect and resolve -- unless you know the right tools.

Network Address Translation (NAT) is one of the basic functions of a circuit level gateway. The simple purpose of NAT is to hide the IP addresses of a private network from the outside world.

Computers may be assiged a static IP address or assigned one dynamically. Typically servers and institutions will use a static IP which will not change each time u get connected. Workstation will use Dynamic Host Configuration Protocol (DHCP) for IP address assignment. It is more easily to find a system if the IP address does not change and is static.

I have looked around the way to find the IP address for Xen guest without login to guest. There were couple of posts and Xen FAQ which list some methods. The following code is very similar to Xen FAQ post in Network section.

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There seems to be a known bug with the Gnome Network Manager included with the Ubuntu 8.10 release that resets any static ip address settings that are set manually when the system is rebooted reverting back to a DHCP setup. These steps will remove the Gnome Network Manager and help you manually setup the required files for your static network configuration.