Jeff Doyle

This blog is my own personal opinion and in no way reflects the position of any past or current employer.

Clearing the fog around open switching terminology

Lessons from Altoona: What Facebook's newest data center can teach us

Lessons from Altoona: What Facebook's newest data center can teach us

How can Facebook's data center design apply to your data center plans?

The Case for /127 Subnets

In my previous post I wrote about all the positives we get from the almost incomprehensibly massive IPv6 address space, all there for our enjoyment if we will just break free of our long-ingrained IPv4 address conservation...

The Logic of Bad IPv6 Address Management

I've written about IPv6 address design previously, and in that post I briefly touched on the fact that our long-ingrained habits of IPv4 address design can lead us astray when working with IPv6. I'd like to revisit that topic, with...

IPv6 in the Enterprise May Happen Unexpectedly Fast

As I write this blog I’m sitting in the Rocky Mountain IPv6 Summit. Specifically, I’m sitting in the Enterprise track. And listening to an excellent lineup of speakers, I’m shifting some of my long-held views on IPv6 in the...

The Case for Enterprise IPv6

The business case for IPv6 in service provider networks – particularly broadband service provider networks – is all about the address supply, and you know the routine well: The IANA IPv4 address pool is gone,  the APNIC, ARIN, and...

What's Next with IPv6?

We recently held the annual executive meeting of the Rocky Mountain IPv6 Task Force – which primarily consisted of eating sandwiches around Scott Hogg’s kitchen table – and a topic on the agenda was a discussion of future directions...

How Are Your Hexadecimal Skills?

I ended my post on IPv6 address design saying I would follow up by showing you a few simple tricks for working with hexadecimal numbers. Then the long-predicted depletion of the IANA pool of IPv4 addresses happened, I got distracted,...

Goodbye to a Couple of Old Friends

I have a couple of charts on IPv4 address depletion that I’ve used in presentations and customer reports for years. With today’s allocation of the last five IANA /8 blocks to the five RIRs, I’ve updated the charts for the last time,...

IPv4: The Beginning of the End

As predicted, IANA has allocated two /8 IPv4 blocks to APNIC. That brings the remaining IANA pool down to five, which triggers a plan to evenly allocate the remaining five /8s to the five RIRs. With the possible exception of AfriNIC...

IPv6 Address Design

There are a few culprits that regularly contribute to delayed or failed IPv6 deployment projects, such as poor DNS planning, insufficient testing, unanticipated application behavior, and poor IPv6 support in peripheral support,...

Can Large Scale NAT Save IPv4?

I've written previously that as we make the slow - and long overdue - transition from IPv4 to IPv6, we will soon be stuck with an awkward interim period in which the only new globally routable addresses we can get are IPv6, but most...

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