Pain points: MLD snooping on Linux bridges

It seems that MLD snooping on Linux bridges has broken various parts of IPv6 connectivity over the past 10 years or so. Initial reports of bugs were from 2013, when having MLD snooping enabled on the bridge broke neighbour discovery (breaking...

Pain points. Or, IPv6-only: the ugly bits

Alongside my tech nibbles posts, I'm going to add another type of short post which chronicles the difficulties I've encountered in trying to achieve my IPv6-only end state. These posts may contain somewhat spicy opinions 🌶️ or ranting 🤬. Mostly I...

Tech nibble: Updated super-smash-brogp

Once again it has been too long between blog posts, and there has been quite a lot of activity going on behind the scenes in The Little Network That Could (or TLNTC, as I call it). I've built up such a large backlog of topics (mostly from the...

When I got hackernewsed

A few months ago now I got a couple of friendly alerts from OpsGenie telling me that my web server VM was down. I logged in and poked around, but things seemed to be pretty normal. The OpsGenie alert self-resolved shortly afterwards, and I...

The Little Network That Could

(Credit: Flickr) Gather 'round, folks - Grandpa has a story to tell. (OK, I'm not a grandpa and I don't expect to be one any time soon, but as I've journeyed back in my memory to write this post, I sure feel old...) For as long as it has been...

VyOS Certified Network Engineer

This morning before work I sat for (and passed) my attempt at the newly-minted VyOS Certified Network Engineer certification. Mostly this post is just to let folks know that the certification is out there and encourage them to take it, but also I...

Pros & cons of chronyd & ntpd

A friend asked me today: what are the pros and cons of chronyd and ntpd? I've used both for a while, but never actually sat down to think about this question. So here are some initial thoughts: ntpd (the older of the two implementations): has had...

Making NTP best practices easy with Juju charms

NTP: a behind-the-scenes protocol As I've mentioned before, Network Time Protocol is one of those oft-ignored-but-nonetheless-essential subsystems which is largely unknown, except to a select few.  Those who know it well generally fall into the...