Config Lab

Over the years, I’ve created a bundle of about 75 lab exercises here at the blog, called Config Labs. The idea is to read the web page for the lab, then do the lab, and then check your [...]

Most Config Lab posts here at my blog follow a consistent formula: A problem statement (requirements, figures, and inital configuration), followed by you creating the configuration, and closing [...]

All of the Config Lab posts here at my blog follow a consistent formula: A problem statement (requirements, figures, and inital configuration), followed by you creating the configuration, and [...]

Some of you, particularly those that subscribe to the blog, will have noticed a lot of posts here at the blog in mid-October 2021. I thought I’d give you a quick update on what I’m [...]

Configuring PAT with a pool of inside global addresses combines almost everything you can possibly configure with NAT in a Cisco router. Look at the requirements in this latest lab and put [...]

PAT – Port Address Translation – plays a huge role in IPv4 networks. Today’s post looks at the simpler of the two configuration options for router NAT configuration: a single router interface IP [...]

Dynamic NAT – specifically, dynamic NAT without also doing PAT – creates a 1-to-1 mapping between an inside local address and an inside global address. Unlike static NAT, however, dynamic NAT [...]

Static NAT matches a single inside local address with a single inside global address. It does not conserve addresses, but it does let you make a server reachable to external devices with a [...]

When first starting out with Cisco routers and switches, log messages are those irritating messages that show up to interrupt us from the current task at hand. Over time, most of us find those [...]

Most of us skim through descriptions of Syslog messages and message levels. This lab helps you slow down just a bit with a configuration exercise that makes you remember message severity levels [...]