Why Your KVM Network Bridge Isn't Working

You're trying to get libvirt and KVM working on Red Hat Enterprise Linux 6 or CentOS 6, or maybe even Scientific Linux 6. But it's not going well.

You wanted your VMs to have full access to the network and you've discovered that virbr0 doesn't do that. Finally you stumbled upon the way to do it by Creating a Network Bridge using your primary interface. And yet, something just ain't right.

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Solved: Renaming em1 to eth0 on Red Hat Enterprise Linux 6

We had a software package that had a braindead licensing scheme. To generate the license, it uses the MAC address of the network interface card of the machine you are running it on. OK, that's a way of identifying a unique machine. But here's the kicker. It just assumes that your ethernet device is /dev/eth0.

For a while now, NICs that are embedded on the motherboard are identified by udev as em1, em2, etc. This is part of an attempt to make interface naming more predictable and meaningful.

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Solved: Mystery DHCP Requests from Dell R815 Broadcom NeXtreme II NICs

Listen, my friends, and I will tell you a tale of mystery MAC addresses, DCHP, and Broadcom woes.

It all started when we got a new server. A Dell R815, to be exact. The specs looked great, it could hold a ton of RAM for some of our bioinformatics projects, and the cost was low. Everyone was happy.

Then one day someone called and said, hey, there are a ton of DHCP requests and we've traced them back to [room that server is in]. Here's the MAC address: 002xxxxxxxd1.

Slides from DrupalCamp Iowa 2011

Here are the slides from my morning presentation at yesterday's "DrupalCorn" DrupalCamp in Des Moines, Iowa. The presentation was designed to be a brief high-level overview of Drupal.

Introduction to Drupal 7 Architecture (PDF, 1.8MB)

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