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	<title>Fnode Online</title>
	<link>http://www.fnode.com</link>
	<description>A Network Systems &#38; Technology Blog</description>
	<lastBuildDate>Fri, 01 Jan 2010 19:57:07 +0000</lastBuildDate>
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	<language>en</language>
	
	<item>
		<title>OSPF Loopback Interface</title>
		<description><![CDATA[OSPF Loopback interfaces are treated as a stub host and will only have a 32 bit host route on the other devices no matter how the subnet mask is entered under the OSPF network statement.
We will explore how we can disable this default behaviour using a few methods.

As you can see, R4 is configured with [...]]]></description>
		<link>http://www.fnode.com/2009/12/ospf-loopback-interface/</link>
			</item>
	<item>
		<title>Convert IPv4 into IPv6</title>
		<description><![CDATA[I was going through 6to4 tunnel configs and thought I’d post some info on converting IPv4 address into IPv6 Address. This is pretty straight forward and its obviously involves HEX conversion.
Here, I will convert the address 192.168.25.234
First we divide each octet by 16 and write down the remainder, primary school maths!  
192 ÷ 16 [...]]]></description>
		<link>http://www.fnode.com/2009/11/convert-ipv4-into-ipv6/</link>
			</item>
	<item>
		<title>TCP Window Calculation</title>
		<description><![CDATA[I was going through some TCP windowing over a high speed WAN link, and thought it might be worth to post some info regarding this.
We do face a typical problem of having slow speed file transfer even if the dedicated pipe is capable of supporting it.
There are three factors which affects this&#8230;

TCP Window Size.
Round trip [...]]]></description>
		<link>http://www.fnode.com/2009/10/tcp-window-calculation/</link>
			</item>
	<item>
		<title>How to configure PPP Multilink</title>
		<description><![CDATA[Multilink is a way of bundling more than one PPP WAN links and bundle them together into one logical interface. This is one of the method you can implement when you have a primary and secondary links in place and create a logical conduit where both links are present.
This method can be used to load [...]]]></description>
		<link>http://www.fnode.com/2009/09/how-to-configure-ppp-multilink/</link>
			</item>
	<item>
		<title>How to Configure Frame-Relay</title>
		<description><![CDATA[Frame-Relay is one of the core concept of networking and nowadays it is one of the under appreciated part on modern networking.
I am just going to go over how to configure it using 4 Routers and one will act as a Frame-Relay cloud.
Before I go ahead and explain the configuration, You can see the below [...]]]></description>
		<link>http://www.fnode.com/2009/09/frame-relay-config/</link>
			</item>
	<item>
		<title>How to enable SSH key Authentication: SSH login without a password!</title>
		<description><![CDATA[If you want to jump between servers without any password authentication but you still need security here is what you have to do.
There are two ways of achieving this:
On Debian/Ubuntu you can just type:

  $ cd $HOME
~$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key:

Press Enter each question and you [...]]]></description>
		<link>http://www.fnode.com/2009/09/how-to-enable-ssh-key-authentication-ssh-login-without-a-password/</link>
			</item>
	<item>
		<title>Quick tip: change default text editor on Linux shell</title>
		<description><![CDATA[Doing visudo you get nano instead of your favorite text editor?
Mine is vim therefore I issue:
DEBIAN/UBUNTU way

# update-alternatives --config editor
There are 4 alternatives which provide `editor'.
  Selection    Alternative
-----------------------------------------------
          1    /usr/bin/vim.tiny
          [...]]]></description>
		<link>http://www.fnode.com/2009/09/quick-tip-change-default-text-editor-on-linux-shell/</link>
			</item>
	<item>
		<title>How to install Debian from USB drive</title>
		<description><![CDATA[I&#8217;ve come across multiple ways of doing it but so far the best way is the following (I assume you are on i386 platform and you have access to the net):
1. Download boot.img.gz from Debian website
2. Download the net-install image choosing i386.
3. Plug your USB drive into a Linux PC, open the shell and type

$ [...]]]></description>
		<link>http://www.fnode.com/2009/08/how-to-install-debian-from-usb-drive/</link>
			</item>
	<item>
		<title>How to change the file timestamp on Linux</title>
		<description><![CDATA[This tip might comes handy when you do a system check and you want to make sure you don&#8217;t check the same file twice.
Let&#8217;s pretend that our &#8220;file1&#8243; is a conf file that needs review. As you can see the output of the command issued below shows that the file was last edited in June.
Today [...]]]></description>
		<link>http://www.fnode.com/2009/08/how-to-change-the-file-timestamp-in-a-linux-system/</link>
			</item>
	<item>
		<title>IP helper-address Explained</title>
		<description><![CDATA[All broadcasts messages are dropped by the router when it receives on an interface. This specific command is enables the router to convert the broadcast messages distended for a specific destination into unicast. This interface level command needs to be applied on the interface which the broadcast receives from.
R1(config-if)#ip helper-address 10.10.10.10
Also there are other options [...]]]></description>
		<link>http://www.fnode.com/2009/08/ip-helper-address-explained/</link>
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