Cisco | How to do it

Cisco: The basics about VRF implementation

VRF, meaning Virtual Routing and Forwarding, is a technology implemented in the IP network routers that allows multiple instances of a routing table to exist on the same router in the same time. Since each VRF is independent, the same IP subnet can exist in 2 different VRFs. Basically you can overlap one IP address [...]

Wireshark’s most useful display filters

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 [...]

How to integrate GNS3 with Virtual PC

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 [...]

The difference between 3G and 4G

Excellent explanation about what is 3G and 4G, speed of the download and different generation of wireless technologies by Craig Mathias.

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Cisco: How to configure simple IP SLA monitor

Before we begin let’s see what is this SLA term, for those of us who are not very familiar with the Service Provider terms. IP Service Level Agreements (SLAs) enable customers to assure new business-critical IP applications, as well as IP services that utilize data, voice, and video, in an IP network. With Cisco IOS [...]

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SNMP Version 3 Authentication Vulnerabilities02 Feb 2010

Multiple Cisco products contain either of two authentication vulnerabilities in the Simple Network Management Protocol version 3 (SNMPv3) feature. These vulnerabilities can be exploited when processing a malformed SNMPv3 message. These vulnerabilities could allow the disclosure of network information or may enable an attacker to perform configuration ...

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Cisco – Remote VTY Command Script

Running one or more interactive CLI commands is a common task in network management. Having a script to automate this task becomes a critical tool. This script automates interactive TELNET or SSH sessions. Any command that ...0 comments
Cisco IP Routing Overview – Part IV

Fourth part from IP Routing Overview. All this material is produced by RouteHub Group consultants, so all the copyrights and greetings have to be directed to them. If was free shared on ...0 comments
Cisco IP Routing Overview – Part III

Third part from IP Routing Overview. All this material is produced by RouteHub Group consultants, so all the copyrights and greetings have to be directed to them. If was free shared on ...0 comments
Cisco IP Routing Overview – Part II

Second part from IP Routing Overview. All this material is produced by RouteHub Group consultants, so all the copyrights and greetings have to be directed to them. If was free shared on ...1 comment

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"How to do it" Latest posts

Cisco: Small escape leading to non-functional NAT

20 Jan 2010

I have seen that a lot of people is using search engines to look after terms like "NAT: failed to allocate address for..." or "NAT: ...
Great tool for testing QoS implementation

16 Dec 2009

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

20 Nov 2009

QoS - one of the most interesting and challenging part of the network engineer's life. I think I'm not wrong when I'm saying that most ...