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August 2008

Dynamic Failover with IP SLA

Mon, 2008-08-04 10:36

I just stumbled across this killer post on Shawn's Blog that describes how to set up IP SLA to allow a static route to failover if pings to a specified internet host should fail. This is really useful if you have two ISPs (and thus, two default routes) where the router cannot detect a link failure. This is really common if you have a cable/DSL modem or some type of wireless connectivity. Here's the basic config, taken directly from Shawn's Blog:
ip sla 1 < The number 1 here is arbitrary, used only to identify this sla.

Solarwinds Enters the NetFlow Fray...for Free?

Thu, 2008-08-14 05:26

Netflow has always been a topic of interest to me. It allows Cisco devices to track exactly how your network bandwidth is used. For example, using NetFlow allows me to see the applications (ports) using my Internet connection, how much bandwidth they are consuming, the source and destination IP addresses that are consuming the most traffic, and so on. Handy information!
Anyhow, Solarwinds has just released a new (free) tool that allows you to chart and graph all this information. This is definitely a plug for their enterprise Orion software which lets you manage bunches of devices...but hey, a free tool is still a free tool :).
Click here to check it out.

GNS3 - The Full Story

Fri, 2008-08-15 13:03

It looks like someone has decided to write some awesome documentation / tutorials for GNS3. Answers plenty of the questions I had when I first got into it (installation, optimization, etc...).

Update: the original link posted seems to have been removed from the Internet. For current information on GNS3, check out the documentation page on their website: http://www.gns3.net/documentation

CCIE Wireless?

Wed, 2008-08-20 13:23

I just received a "general announcement" in my email about registering for the BETA CCIE Wireless written exam. Wow - yet another CCIE specialty arrives.

If you'd like to see the CCIE Wireless Written Exam blueprint, click here.



Dr. Radut