NTEN225

Capturing packets on a cisco router

Cheat sheets for network engineering. eg: IPV6, EIGRP, OSPF, VOIP etc...

Security Webcasts

One of the issues facing network and security engineers is defending the network against dynamic threats. This means traffic that cannot easily be identified by regular means, such as an application that changes layer 4 ports or tunnels within an existing protocol. Because of this, a solution is needed to match and filter based on specific information within the packet that is unique to the application you want to block.

Network Troubleshooting Video Mentor, Downloadable Version

Cisco configuration examples

There are many different connectors in use for Fibre Optic Cabling. This is a brief overview of the different types of connectors, whether they are still relevant, and practical notes from my experience about the uses and purposes.

Some good pointers to network engineering blogs, podcasts and other resources.

A quick way to generate traffic using SLA Monitors

A blow-by-blow record of one of the worst health-care IT crises in history and what CareGroup CIO John Halamka learned from it.\n\nWhat can happen if an old network is asked to carry new applications\nHow standard disaster recovery protocols can fail\nLessons learned from the four-day crisis

DMVPN/GETVPN Design & Case Study

Comparison of features available with the different IOS 15 licences.

Full GNS3 And Dynamips Topology Config Files ..

A wiki page dedicated to explaining Troubleshooting Commands for IOS Devices in practical terms. The intent is to compile commands relevant to troubleshooting the behavior of a Cisco IOS device itself (CPU, memory, performance, etc.) and to provide an accompanying description of each.

A very simple comparison between the syntax for ipv4 and ipv6 access lists.

Great introduction to PFR

A quick summary of the protocols and commands used for PPP. Includes PAP, CHAP and EAP as authentication mechanisms.

To encode, you're going to need Coagula (Windows-only), and to decode you'll need Sonic Visualizer (Windows/Mac OS X/Linux). You can watch the video above for a visual walkthrough, but here are the steps you need to follow:

Port-channel (or etherchannel) is a great way to increase the transport capacity between 2 switches or between a switch and an end device that suport load balancing (e.g. server). Today I don't want to focus on how the Port-channel are configured, but more on how they load-balance the traffic over the multiple interfaces included in a bundle.

In the previous installment of our series of IPv6 security posts, we covered some of the ways addressing has changed in IPv6 compared to IPv4. In this post, we'll talk about some of the things to consider when securing IPv6 compared to IPv4. Before digging into this topic, however, it is important to remember that while IPv6 may have different security concerns than IPv4, it is not necessarily any more secure than IPv4. Furthermore, the post will focus on those aspects that are different or unique to IPv6, since many of the common best practices for IPv4 networks also apply to IPv6 networks.