Donavan Fritz

This Site is Still IPv6 Only

Sun, 12 Sep 2021 00:00:00 +0000

This site is still IPv6 only. One drawback from my original attempt at doing IPv4-less was the failure mode. IPv4 users did not understand the problem. It would be indistinguishable if this site was actually down, or if the user did not support IPv6.

For example, using curl we see a Could not resolve host error. This error can give the impression that this site is offline, vs incorrect IP protocol version.

This Site is IPv6 Only

Mon, 06 Sep 2021 00:00:00 +0000

This site is now IPv6 only. I have been thinking about this for a long time, and I decided to just do it. A records have been removed, and only AAAA exists for reaching this site. See Below:

user@machine$ host fritz.dev
fritz.dev has IPv6 address 2620:79:e000:fb01::206
fritz.dev has IPv6 address 2620:79:e000:fa00::206
fritz.dev mail is handled by 10 mail01.fritzlab.net.
fritz.dev mail is handled by 20 mail02.fritzlab.net.

But. I’m not a complete psychopath. Legacy IPv4 compatibility is available at ipv4.fritz.dev (it’s actually dual-stacked).

IP Prefixes on EC2

Fri, 23 Jul 2021 00:00:00 +0000

What are IP Prefixes?

Yesterday, AWS released IP Prefixes for EC2. IP prefixes are a contiguous, summarizable, blocks of IPv6 and/or IPv4 addresses. These prefixes are assigned to a single Elastic Network Interface (ENI) in a VPC (which is typically attached to an EC2 instance). In the most basic sense, it’s this:

Why do I want this?

It comes down to efficiency, simplicity, and scalability for container platforms. Let’s break this down-

Notes for Running Tinc on an EdgeRouter (EdgeMAX)

Sun, 19 Apr 2020 00:00:00 +0000

Introduction

I have been running tinc on a Ubiquiti EdgeRouters for about five years. Tinc has been great for creating dynamic multipoint VPN tunnels between EdgeRouters for the purposes of extending private IPv4 address connectivity. The problem space and setup is straightforward. I am writing this post for the following reasons:

1- Most of the time this is a “set it and forget it” type setup, however, from time to time it requires some maintenance. The time in between the periods where I need to edit this setup (troubleshoot, add a new node ..etc) is quite long. I intend this document to be used as a reference for my future self.

Just Start

Sat, 04 Apr 2020 00:00:00 +0000

This is my first blog post and a step towards my 2020 goal. Every year I set a few personal goals, this year one of my goals was to start a personal website/blog. I have wanted to create a personal blog for many years, but always struggled to get started.

Generally I always find myself aiming for perfection. This is especially challenging when trying to create a personal blog that will be viewed as a reflection of who I am. There are countless ways I’ve tried to nitpick the perfect design and perfect content slate. However, perfection is a form of procrastination; and I should bias towards action.

About Me

Fri, 03 Apr 2020 00:00:00 +0000

My name is Donavan Fritz. While I am currently employed at Netflix, the words, thoughts and opinions on this site are my own and do not reflect any past, current, or future employer.

I have an amazing wife (pictured with me on the right); and I am a father of two young children. I live in work in the San Francisco Bay Area, however, I was born and raised in rural Wisconsin. When I’m not working I enjoy watching Netflix (ironically), getting outside and spending time with my family, and playing around with technology (like building this site).

IPv6 is Required

Mon, 01 Jan 0001 00:00:00 +0000

This site requires IPv6. Please contact your network administrator and ensure you are not restricted to using legacy IPv4 only. If you are not redirected in thirty seconds, click here.