Retro Post: An Introduction to Subnetting

Back in about 2003/4 I wrote a tutorial on subnetting.  I posted it up on a couple forums that I frequented at the time and then forgot about it.  I came across it about again about a year ago, and then today I actually dug it up to reference it in a post I was making.

Since its mine, I decided that I would post it up here now.  I think it's fun to go back to when I was getting my start in Networking and see some of the sorts of things I wrote back then.  So without further ado, get into the time machine and enjoy this old, very basic tutorial.

Written down. Lab to go.

I passed the 350-001 CCIE Routing and Switching Written test today.

Onwards to the lab!

The Mess that is QoS in Layer 2

Since I looked at QoS Classification and Marking in the IP Header I figure I might as well finish it off and go over the same topic at Layer 2.  I kept the title, but in reality it's not that bad here.  There's a lot more consistency between the various Layer 2 technologies and things seem to translate pretty well.  The only real challenge comes into play when you need to start translating a Layer 2 marking to a Layer 3 marking, and vice versa.  I'll get to that in a bit, but first lets look at what we have to work with.

The Mess that is QoS in the IP Header

If there's a group of people out there that should be drug out into the street and shot it's the jackasses that designed QoS classification and marking in the IP . More specifically, the jackasses that decided we needed multiple definitions of the same bits and different bits at different layers. I sometimes wonder if the only reason that QoS classification and marking is this way is so that vendors, like Cisco, can test you on it.

At any rate, things are the way they are and we must learn it. 

Networking-forum.com is giving away 8 copies of AAA Identity Management Security

http://networking-forum.com/viewtopic.php?f=29&t=21126

Good Luck!

Me and IPexpert

I got a package in the mail today...

Finally!

Money has been spent.  Materials have been received.  It's friggin on now!

CCIE Lab:  I'm coming for you.

PeerIX Version 6: BGP and IPv6

I got involved in a project called PeerIX this week.  It's a group of guys that have all connected various routing devices together over GRE and/or IPsec tunnels to form a BGP network for learning purposes.  I got involved when a a thread on Networking-Forum about this group started thinking that this might be interesting to do the same concept with IPv6.  As I was one of the people that was interested here I am posting about it.

Shared IPsec with DMVPN and VRF-Lite

I did up a blog post for Steve over at Networking-Forum.com on a funky setup using Shared IPsec.  Here's the link for your reading pleasure.  http://www.networking-forum.com/blog/?p=1110

IPv4 Headers

I need to learn header formats better.  Tonight I started with the IPv4 header.