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IPv4 Link Local Addresses in Fedora

A network link-local address is an address that is valid only for use within the network segment or the broadcast domain that a host is connected to. Link local addresses can be layer 2 or layer 3. For example, a 48-bit Ethernet MAC address is one form of a layer 2 link-local address. Link-local addresses are generally not guaranteed to be unique beyond a network segment. Because of this, layer 3 switches (routers) do not forward packets with layer 3 link-local addresses. For Layer 3 IPv4 link-local (IPv4LL) addresses, RFC3927 specifies the address block Zero-configuration Networking (zeroconf) is a

VirtualBox Guest Additions on PAE kernel

It you are using a PAE (Physical Address Kernel) kernel in a Virtual Box guest and wish to install the VirtualBox Guest additions, you need to download the kernel-PAE-devel package as well as the kernel-headers package. PAE kernels are available for Fedora, Red Hat, CentOS and more. Otherwise you will end up failing to build the main Guest Additions kernel module and getting a misleading message in /var/log/vboxadd-install.log after attempting to run sh ./ *** Error: KERN_DIR does not point to a directory. That message is misleading as the real error is due to you not having the PAE headers

GNOME Weather Extension New Version

I got some time recently to update my GNOME Shell weather extension. Most of the changes were minor. Version 2.5 is now available at or on GitHub. Here is what the weather panel looks like: This is the configuration panel for the extension: If anybody is a graphics artist and can develop a nicer set of weather icons (approx 60), I would welcome their help. This version works with Gnome Shell 3.4 and has been tested with Fedora 17.

Most Fedora Users Do Not Need Avahi Service

Avahi is a technology which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In theory, this enables you to plug your computer into a network and instantly be able to view other people who you can chat with, find printers to print to or find files being shared. Avahi also allows your computer to advertise running network services. Avahi implements the Zeroconf specification, mDNS, DNS-SD and RFC 3927/IPv4LL. It also uses D-Bus. Compatible technology is found in Bonjour/mDNSResponder. By the way, Avahi is the Malagasy name and scientific Latin name of a genus of woolly lemur,

Change GNOME 3 Lock Screen Background

Once again the GNOME developers have managed to complicate things beyond belief. Why the GNOME UI Nazis decided there should be no simple way to change the background for both the login screen, the desktop backgound and the screen lock background is beyond comprehension! In a previous post I explained how to change the GDM (GNOME Desktop Manager) background image. In this post I explain how to change the Lock Screen background image. Taking Fedora 17 (Beefy Miracle) as an example, as root edit /usr/share/backgrounds/beefy-miracle/default/beefy-miracle.xml. Here are the contents of this file: <background> <starttime> <year>2012</year> <month>01</month> <day>29</day> <hour>00</hour> <minute>00</minute> <second>00</second>