October 19th, 2007
Hello once again, and nope, we’re not gonna talk about networks this time. We’re gonna talk about you!
To explain my self a bit more, Netralized became one month old. Well you can ask yourself, so what?
We have 2 reasons to celebrate.
- We made it sure we like to blog about networks, and on a frequent basis. Monday, Wednesday, Friday seems that is our current posting days frequency and we think that it is a good one and most of all, a frequency we can keep up to, at least with our current busy schedules. It’s not a promise that posting will occur on those days but at least for now, it has worked perfectly.
- We found out that this type of communication has meaning, to you and us. We’ve received many emails and comments even when the blog was at its primal stages of development. And it’s going better and better every week.
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October 17th, 2007
In my previous article: Using SSH Instead of Telnet I gave you an overview why you must use SSH instead of telnet. In this article I will show you how to configure a router as an SSH server. Keep in mind that you will need an SSH client to connect to the server. Popular SSH clients are Teraterm, Putty and OpenSSH.
Before configuring SSH, verify that you have configure your router as AAA server with local authentication and you have set all the appropriate usernames and passwords
Here is the configuration:
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October 15th, 2007
Accessing remote network devices for monitoring purposes or for configuring it, is an everyday activity of any network administrator.
But which remote access method you use?
Maybe telnet is a good idea if you don’t care about security.
Always keep in mind that using telnet to communicate with your remote network devices is not secure because all the traffic that passes through the telnet session is sent unencrypted. Saying all the traffic includes also your passwords. This means that anyone who can eavesdrop your data can easily find your password.
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October 12th, 2007
After Lebyathans comment in the article “understanding ip addressing“, I have decided to give you an example of subnetting using the ip and subnet mask he mentioned. In this article you can see how we can find the network address, first valid host, last valid host, broadcast address, number of subnets and number of hosts in our network.
The Ip address is 192.168.5.33 and the mask is /27
First translate the mask from /27 to decimal form. /27 means 27 continuous 1’s in binary. It looks like this 11111111.11111111.11111111.11100000 and if we do the conversion to decimal the result is 255.255.255.224
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October 10th, 2007
Welcome again. This unfortunately is not an article about networks but it is an article about our network. Well let me explain. As you may have noticed, the previous week was a hectic one. We had several problems with our host, latency, slow loading of the pages and sometimes timeouts. After thinking a bit with Jim, we decided to move Netralized to a better host, a more professional one.
Changes had to be made and we now think we’re back on track so we can continue our blogging journey to the cybercpase 
The new host has more ram and cpu dedicated to us so we won’t have any problems. Thanks to their support, the transferring was really fast and Netralized is now faster and more stable.
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October 8th, 2007
Configuring the passwords of your network device is the first step to achieve security.
How do we do this?
In Cisco devices we have four different basic types of passwords;
- enable password
- secret password
- telnet password
- console password
Now let’s analyze them.
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October 5th, 2007
When you have access to a Cisco network device; for example a router, in your console interface appears the host name of the device and the prompt. It looks like that:
In the image above the Hostname of the device is RouterA and the prompt is >.
This prompt means that you are in user mode and you can perform only few commands.
If you are wandering which commands you can perform, just type the symbol of the question mark “?”. When you type a question mark, that means help, the device shows you all the available commands that you can use in this mode.
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October 3rd, 2007
I was thinking to write about DSL, VPN, ACLs and other configurations on cisco devices. But first things first, it’s important to know about the operating system of cisco network devices.
IOS (Internetworking Operating System) is the operating system that cisco devices use. IOS belongs to CLI (Command Line Interface) category of operating systems; this means that the administrator has to write commands in order to perform different tasks on the device. Note that some Catalyst network devices use the CATOS operating system, which is also a cisco software product and a CLI operating system.
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October 1st, 2007
To start working with a Cisco device you need to access it somehow. You can configure it via the console port or via telnet.
1. For accessing the network device by using the console port you will need a rollover cable that normally gives you a serial edge and an RJ-45 edge.
Attach the serial edge of the cable, to the serial port of your PC or laptop and the
RJ-45 edge to the console port of the cisco network device.
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September 28th, 2007
Setup and configuration of a home wireless network is not a very difficult task. Although, we need the appropriate devices and some basic knowledge. All the devices that will connect to the wireless network must have a wireless network card. Usually laptops and PDAs have the wireless card on-board or if they don’t, we can add a network card attaching it to a PCMCIA slot.
For desktop computers we can install a network card using a PCI slot or we can use the USB port. USB network cards have become very popular because it’s very easy to install them to PCs.
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