Tag: tools

Tools of the trade

A Better (?) Way to Handle Logs

Happy new year, all.  I’m finally over my hangover from the party and ready to blog. Everywhere I go, I always wind up in a debate about how to alert on log messages as they come in.  I was at…

A Little Politics for the New Year

Stretch at Packetlife has a lively little write-up on the Australian government’s attempt to implement a nation-wide web filtering service. From Packetlife.net: Setting aside the myriad of technical barriers to implementing such a system, the most obvious question is, “who…

Is That a Bandwidth Graph or a Polygraph?

I thought I’d throw an easy one out before taking off for the holiday.  Merry Christmas, Hannukah, Kwanzaa, Saturnia, etc., to all. A few years ago, I was looking through some Cacti graphs of gigabit trunks between 6500s and noticed…

How Screen Can Change Your Life

Alright, that’s an exaggeration, but screen is pretty freaking cool.  It’s an app that’s (usually) run under Linux that lets you run commands then detach from that session and reattach later.  It doesn’t seem like much, but a few examples…

Loading Configs at Startup in Dynagen

Here’s a quick one for you. In Dynagen, if you want to load a configuration when you first fire up the router instance, you can use the cnfg tag in your NET file like this. cnfg = /home/jac/labs/cfg/R0.cfg If you…

A Must-Know: TCPDump

If you’ve never used TCPDump before, you’re missing out on one of the best parts of being a network guy — pointing fingers at everyone else. TCPDump is an open-source app that copies packets on a machine’s NIC to screen…

Auditing Your Gear with Nipper

Let’s talk [tag]audit[/tag]ing for a bit. It’s important to have an outside person look over your [tag]configuration[/tag]s every so often to be sure you didn’t do something stupid, so, every quarter or so (mostly so), I bring in someone to…wait…

Free and Awesome Network Tools

We all have limited budgets these days. Long gone are the days of unlimited resources and uncontrollable expansion of the network, so it’s important that any network dude or dudette pay attention to the open-source world. Below is a list…