Wordpress Shoutbox

I was searching a good shoutbox for my hosted wordpress blog. Then I found a wordpress plugin for shoutbox. The name of the plugin is Wordspew. It was difficult to find out the pluggin because it is not maintained anymore by Andrew, while most of the posts I found on google were pointed to Andrew.

Finally I found the link of where the latest update can be downloaded.
Here is it, on Pierre's website.

Installing SSLeay on Ubuntu

I had a very hard time to install SSLeay on Ubuntu either by using cpan or compiling it directly from the source. It looks like that some headers were missing on the compilation process so I got so many errors and unable to compile the module.

I finally realized that there are always an easy way to do it on Ubuntu, as usual, by using apt-get.
Here is the command to install SSLeay on Ubuntu

sudo apt-get install libnet-ssleay-perl
sudo apt-get install libcrypt-ssleay-perl

Installing Debian without any CD installer

I really wanted to install Debian on my machine but I didn't have any CD installer of Debian. I was thinking of downloading the image from the web, but unfortunately I didn't have any empty CD to burn the image.
Finally I found a very good page on Debian website, telling that it is possible to install Debian without any Debian CD. It said that Debian can be installed over the network as long as I have a working *NIX OS on my machine. It is a very good solution to me since I have Ubuntu already on my machine. Then I only need to create another partition for Debian, follow the steps, and then now I'm running Debian.

The complete instructions can be found here

There are some additional steps need to be done on my machine since the instructions above will only install Debian without the GUI.
Here are the steps:
1) Login as root
2) apt-get install x-windows-system-core
3) apt-get install gdm
4) apt-get install gnome

That's it. Have a nice try.

RootGuard

RootGuard prevents a port to be a ND (non designated) port. So the port should always be designated. If the port receive a better BPDU, the port will become root-inconsistent state and the port will be blocking

LoopGuard

LoopGuard need to be enabled on Root Ports and Alternate Ports. When the port is not receiving BPDU, then the port will become a Loop-Inconsistent blocking state.

Looks simple, but unfortunately the sample answer of a question I got didn't match with my answer. Need to dig more about this.

Administrative Distance

When there are multiple routing protocols running on a router, and each protocols has a route then a route to the destination, then the router will select a path with the lowest administrative distance. So, the table below need to be remembered.

Route Source	Default Distance Values
Connected interface	0
Static route	1
Enhanced Interior Gateway Routing Protocol (EIGRP) summary route	5
External Border Gateway Protocol (BGP)	20
Internal EIGRP	90
IGRP	100
OSPF	110
Intermediate System-to-Intermediate System (IS-IS)	115
Routing Information Protocol (RIP)	120
Exterior Gateway Protocol (EGP)	140
On Demand Routing (ODR)	160
External EIGRP	170
Internal BGP	200
Unknown*	255

ODR (On-Demand-Routing)

Q: What is ODR ?
A: On-Demand Routing is not a routing protocol. It uses Cisco Discovery Protocol (CDP) to propagate the IP prefix. ODR is a perfect solution for hub and spoke topology when the spoke routers act as stub routers by connecting to no other router other than the hub. If you only use Cisco routers in your network, running Cisco IOS® 11.2 or later, you can use ODR. If you are running dynamic protocols (for instance, if you are an ISP), ODR is not suitable for your network environment

Q: How can I configure ODR ?
A: Configure the router odr command in the hub router and turn off any dynamic routing protocols in the spoke routers. Spoke routers automatically start to advertise their subnets using CDP. You do not need the router odr command on spoke routers

More info about ODR ? Check on this link