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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