Review: robtex.com — DNS and Peering Tool
March 15, 2010 by Greg Ferro · Leave a Comment
An astonishing resource that provide a lot details on BGP AS, IP addressing, ownership, whois, DNS checking and much more.
Reloading IOS Config at CLI for Dynamips/Dynagen
March 14, 2010 by Greg Ferro · 1 Comment
David Sudjiman show us how to save and reload Cisco IOS configurations from the command line in Dynamips / Dynagen.
Dynamips, Dynagen, GNS3 0.7, IOS15.0 and Snow Leopard OSX
March 10, 2010 by Greg Ferro · 8 Comments
It works.
Using Choosy for OSX. A Better Way to Use Multiple Browsers.
March 6, 2010 by Greg Ferro · 3 Comments
I use multiple web browsers all day. One for typical web, and another for network management. I need a way to easily select which one I want.
Notes on Cisco Catalyst 6500 Architecture. (Or What Does 720 in Supervisor 720 Mean ?)
February 4, 2010 by Greg Ferro · 11 Comments
What does the ‘720’ in the Supervisor 720 stand for ? Or, what do you need to know about Cisco C6500 switch architecture.
Key Change for Cisco IOS 15 — Feature Licensing and How We Work.
January 13, 2010 by Greg Ferro · 9 Comments
Welcome to IOS 15, Feature licensing and complicated maintenance procedures.…
Cisco Announces EOS and EOL Cisco IOS Software Release 12.4
January 13, 2010 by Greg Ferro · 3 Comments
Cisco announces the End of Life and End of Support dates for 12.4. Before IOS 15.0 is even warming up, the previous version of 12.4 is already on life support.
Can You Learn Anything From Google or Facebook Data Centers ?
January 10, 2010 by Greg Ferro · Leave a Comment
Google and Facebook have been puffing themselves up about how clever they are at solving technical problems. Is it just cheap marketing, and is there actually anything that Enterprise computing can learn from what they have shared ?
Google DNS — Not Proving to Be ‘All That’
December 8, 2009 by Greg Ferro · 3 Comments
So I have been testing Google DNS server with the new tool that they just released. It might be early days, but it ain’t as fast as the alternatives for me.
Configuring Network Locations in Mac OSX.
December 3, 2009 by Greg Ferro · 5 Comments
When you are working in a lab environment, you often need to connect your laptop to different networks so that you can test stuff. For simple change like an IP address or a default gateway a script is useful. But you may want to have a much more sophisticated profile, such as different proxy servers and multiple ethernet ports. And if you are working on different sites, each one with different IP addressing and DNS details, and maybe even different proxy settings or 802.1x. Mac OSX has a way for configuring multiple profiles for your Ethernet connection ( or Airport wireless).
Install GNS3 on Mac OSX Leopard
October 28, 2009 by Greg Ferro · 21 Comments
This post looks at installing GNS3 on Snow Leopard and has a number of screenshots and some tips on making it go well.
Putty, the Command Line and NO Clicky Clicky
October 5, 2009 by Greg Ferro · 28 Comments
While it may be a personal preference for me, I believe that you should only use the mouse when you don’t know what are doing. If you have a repetitive task, then clicking the same thing over and over shows that you are poor engineer. Lets hack putty to work from the command line.
Setting the Defaults for PUTTY
September 20, 2009 by Greg Ferro · 6 Comments
Putty is is a great piece of software. Because it works and it’s free I find it installed on most corporate desktops as the default software for terminal client on Windows but not everyone seems to know how to set the defaults.
IOS: “Terminal Monitor” on, Off — Logging to Your Terminal
September 17, 2009 by Greg Ferro · 1 Comment
I get asked this question just often enough to post an article. When you have enabled ‘term mon’, how do you turn it off ? How can you tell it’s working ? And so on.
IOS: Console, Terminal, Monitor, VTY — What Is What ?
September 16, 2009 by Greg Ferro · 3 Comments
Sometimes when I talking with other engineers about connecting a console or terminal to a router, they don’t use the right terms. So, here is an article that covers the conventions for the terms console, monitor and terminal.
IOS: Clearing an Interface Configuration
September 13, 2009 by Greg Ferro · 4 Comments
You need to clear an interface in IOS but there are a load of configuration elements there. Once command can clear the lot.
IOS: Setting Terminal Window Length
September 10, 2009 by Greg Ferro · 1 Comment
Why does IOS always make you press the ‘more’ key all the time when displaying configs ?
Cisco IOS Order of Operation — Updated, Again
September 9, 2009 by Greg Ferro · 11 Comments
I often need to refer to the IOS order of operation when I start stacking multiple functions in an IOS configuration.

