Understanding CIDR notation

By Karl on June 15, 2009 9:12 AM | 2 Comments

Good guides for those that need a quick dive:

Wikipedia: CIDR notation. Terse. Without understanding of IP addressing and subnets worthless. So the following give a better big picture:

Cisco: IP Addressing and Subnetting for New Users

MediaWiki's guide to blocking ranges: Help:Range blocks

Yahoo! Small Business Help: What is CIDR?

Microsoft: Understanding TCP/IP addressing and subnetting basics

2 Comments

Mat Schaffer | June 17, 2009 10:25 PM

I also wrote a CIDR->netmask converter function in bash for use with vpnc:

http://bit.ly/ARld

$(()) for math is pretty handy.

Karl | June 21, 2009 5:03 PM

Damn that's pretty cool Mat.