Currently viewing the category: "Network Tools"

Great tool for testing QoS implementation

By On December 16, 2009 · 5 Comments

After my last post, some readers were asking what tool did I used for testing the QoS and how satisfied I’m with it.

The name of the tool is Packgen. According to its developer developers, “Packgen is a simple network packet generator handling diffserv markers, useful for testing [...]

Continue Reading →

Draw network diagrams with Visio under Mac or Linux

By On November 12, 2009 · 7 Comments

Maybe one of the biggest loss of mine when I switched from PC to Mac, was the Microsoft Visio is not available for any other platform than Windows OS. Now, I’m not a big fan of Microsoft products, but I have to admit that they have some good products, and one of this is Visio. [...]

Continue Reading →

Routing + QoS + Security all free for you and your small business

By On July 9, 2009 · 2 Comments

OK, you catch me as this is not from Cisco, but is related to networking and security, so I believe it fit in the idea of this blog. What I’m talking about here?! Well, let’s assume that you are the IT guy of one small business or even your home network, and like all of [...]

Continue Reading →

Wireshark’s most useful display filters

By On May 3, 2009 · 7 Comments

Now and then, especially when you expect less, the network crashes or encounter an issue and then you had to troubleshoot. Sometime the problem is right there, you can see it and it’s easy to fix, but in other cases you’ll have to put an eye in the packets that are traveling through it and [...]

Continue Reading →

How to integrate GNS3 with Virtual PC

By On March 23, 2009 · 12 Comments

In this article I want to show you how to extend your posibilities to test a network in GNS3. Sure, it’s simple sometime to use a Loobpack interface on one of your edge routers to simulate an external network, but sometime is useful to have something connected to the router port. Take as an example [...]

Continue Reading →

How to analyze Cisco NetFlow with FREE tool

By On March 14, 2009 · 5 Comments

NetFlow is a network protocol developed by Cisco Systems to run on Cisco IOS-enabled equipment for collecting IP traffic information. It’s proprietary and supported by platforms other than IOS, such as Juniper routers or FreeBSD and OpenBSD. Cisco routers that have the Netflow feature enabled generate netflow records; these are exported from the router in [...]

Continue Reading →

GNS3: How to create Frame-Relay Hub and Spoke lab

By On February 22, 2009 · Leave a Comment

When I first came in touch with GNS3 I had not idea how to work with it. Not because it is so complicate to operate, but because I didn’t saw any software like this one. GNS3 and Dynamips make a very good job together, allowing users to emulate a lot of network scenarios with different [...]

Continue Reading →

How to monitor IP SLA with free tools

By On February 18, 2009 · 5 Comments

Lately I saw an increasing interest for IP SLA monitor and analyze of the data output. I believe that you already know that you can do IP SLA monitor with a lot of tools from the most expensive ones which include support and assistance to the free ones like MRTG or RRDTOOL. From the statistics [...]

Continue Reading →

GNS3: How-to save multiple topology configurations for good

By On December 19, 2008 · 4 Comments

GNS3 is an extremely useful tool if you are using Dynamips to emulate Cisco devices. It is a graphical environment in which even a newbie can do complex configuration by clicking and dragging routers, switches, connections into a topology that can be saved.

The problem that occurred to me in the past (and maybe to [...]

Continue Reading →

Dynamips: How to save vlans after switch reload

By On November 11, 2008 · 3 Comments

Most of you already know that in Dynamips after a reload of a switch all the vlans and vtp configurations are gone. There is a way how to save the vlan and vtp configuration even in case of a reload of the switch and I will show you below how to do it. For switch [...]

Continue Reading →