Designing Networks for Selfish Users is Hard


‘ On Earth Day at 1990 , New York City's Transportation Commissioner decided to close 42d Street , which as every New Yorker … [Read more...]

HTIRW: Provider Peering Types


One of the confusing aspects of Internet operation is the difference between the types of providers and the types of peering. … [Read more...]

Windows ISATAP Client, Part 2


In Part 1 we discussed how to turn off ISATAP on Windows host—which is a great idea.  Turning off unnecessary components of … [Read more...]

A History of Load Balancing

A History of Load Balancing - Companies

A visual representation of the company and, to a lesser extent, product history of the load balancing/application delivery … [Read more...]

Common Design Tools and Attributes for Everyone Part-1

There are design tools which we should consider for every design. LAN, WAN and the data center where these common design … [Read more...]

Jr. Network Admin Willing to Work In Columbus, Ohio? Let’s Talk!


Carenection is where I currently work as the Senior Network Architect. We are looking for a Junior Network Administrator. If … [Read more...]

Introducing the Multicast “Dating Service” (aka the “RP”)


In February of 2001 I attended a 5 day multicast class within Cisco taught by none other than  Beau Williamson!  In both his … [Read more...]

Why logging is so important? VSS example.

Example: Why switch in VSS mode crashed? Few weeks ago there was a great podcast about logging (show 192). Recently I came … [Read more...]

What is Service Chaining?


This post is in response to a comment on one of my previous posts on using MPLS in the Data Center. Service chaining has … [Read more...]

More DHCP Snooping

Screen Shot 2014-08-07 at 12.47.37

This post is a follow up to Ethan's post and Edward's post. Both were very useful to me as I began to plan rolling out this … [Read more...]

HTIRW: DNS Security


In the last few posts on this topic, we've talked about the various bits and parts of the DNS system, from who pays to how it … [Read more...]

Using Big Tools for Small Problems


BGP in the data center? And MPLS? Are you insane? Well, maybe, yes. But then again, I've been known to do a lot of crazy … [Read more...]

Confessions of a Troubleshooting Junkie


“Hey Fish, how good are you at BFD? None of my BFD neighbors will come up.” Two simple sentences and I am “hooked.”  I love … [Read more...]

Raspberry Pi as a Deliciously Simple VPN Endpoint

Being the networking nerd I am, I have a pretty big network at home.  And as the denizens of the Packet Pushers IRC … [Read more...]

Ansible Rapid Development Environment using Vagrant

Vagrant VM as Ansible target

First off, this post isn't a straight-up networking post; although it does contain networking content (enabling Vagrant VMs … [Read more...]