There could be numerous reasons to create a fake Ethernet interface on a Linux server though I have heard that people might do so to get around licensing of software that is tied to the MAC address of a specific Ethernet port. You really just enable a dummy Ethernet interface and assign the MAC address to it which is explain in more detail below. The easiest way to do this is to simply assign a MAC address to an Ethernet interface you are not using on your server where the drivers have already been installed automatically. If you do not have a spare Ethernet interface then the instructions below will assist you to accomplish your goal.
The other day Martin and I were changing some things around on the computer shop’s network and we needed to modify the IP address of the credit card machine so it would operate properly on our new setup. While changing the Internet Protocol address isn’t very hard the issue we ran into was figuring out how to type a period after each octet of the IP. After some fooling around we figured it out and we have explained all of the steps below to modify the IP address of a Vx570 CC machine.
A couple days ago I was working on the network at the computer shop and ran into an issue configuring the Cisco Catalyst 2950 switch we have on part of the network. The goal was to set up three VLAN’s to segregate traffic on three segments of the network that each have their own purpose. One of the VLAN’s is used by the employees, one VLAN used for the public, and the third VLAN used to host servers that provide various services. I was in a rush to minimize downtime when I was configuring the access to the 2950 switch itself and attempted to assign an IP address to two of the VLAN’s. Below I explain the details of the issue that caused as well as an explanation of why this won’t work.
I had a customer today who brought in a laptop and wanted to switch over to Ubuntu linux. I always try to go the extra mile for people who want to convert to Linux. After installing Ubuntu 10.04 LTS, I rebooted and to my dismay the wired (eth0) interface was not working. I always run into wireless problems with Linux but its pretty rare that a wired interface doesn’t work. Below I show the fairly simple fix.
I started an install of Gentoo Linux this morning on a desktop at my house so I could test some browser stuff that purehate was seeing via his Gentoo laptop. I don’t think I have ever installed Gentoo but its possible a couple years back I installed it in the same scenario. Anyway I decided to download the x86 minimal install CD for the installation. After it was burned to CD I booted my desktop up and started the install. Once it was booted I configured the network interface, which in this case was eth0, and was able to test without issue to the Internet using ping. I proceeded with the installation including writing the partition table, creating the file system, and mounting my drives. The next step involved using links to open a gentoo.org URL to select a mirror and to my surprise it failed. Below I go into detail about the problem I ran into and the steps I took to resolve the issue.