DNS 2XL

The first part of this report on the handling of large DNS responses looked at the behaviour of the DNS, and the interaction between recursive resolvers and authoritative name servers in particular and examined what happens when the DNS response is around the Internet’s de facto MTU size of 1,500…


DNS XL

We’ve written a number of times about the issues of managing packet sizes in packet-switched networks. It’s an interesting space that is an essential part of the design of packet-switched networks, and a space where we still seem to be searching for a robust design. This work has been prompted…


DNS Trends

We used to think of computer networks as being constructed using two fundamental common infrastructure components: names and addresses. Every connected device had a stable protocol address to allow all other devices to initiate a communication transaction with this device by addressing a data packet too this protocol address. And…


Scaling the Root of the DNS

The DNS is a remarkably simple system. You send it queries and you get back answers. Within the system you see exactly the same simplicity: The DNS resolver that receives your query may not know the answer, so it, in turn, will send queries deeper into the system and collects…


DNS Query Privacy Revisited

This article was first written in August 2019, and it ended with the comment: “It’s likely that we will return to this measurement of the use of Qname minimisation in a year or so to see if anything has changed from the picture today.” A year has passed and it’s…


DNS OARC 32b Meeting Notes

Much the Internet operations and research world has gone virtual for 2020. Meetings continue to take place and while the level of interaction in these meetings is different, many of these meetings continue to engender useful conversations. In my case I’m interested in the infrastructure that binds the network together…


IPv6 and the DNS

These days it seems that whenever we start to talk about the DNS the conversation immediately swings around to the subject of DNS over HTTPS (DoH) and the various implications of this technology in terms of changes in the way the DNS is used. It’s true that DoH is a…


Where is the DNS Heading?

I was on a panel at the recent Registration Operations Workshop on the topic of DNS Privacy and Encryption. The question I found myself asking was: “What has DNS privacy to do with registration operations?” The registration function is part of the process of public attestation relating to some form…


DNS OARC32a Meeting Report

Once the realisation sunk in that the lockdown response to the COVID-19 pandemic was not a short-term hiatus in our lives but a new normal, at least for a while, then a set of meetings and workshops have headed into the online space. For many years I have been a…


A DNS view of Lockdown

By Joao Damas and Geoff Huston   At NANOG 79 earlier this month Craig Labowitz from Nokia Deepfield presented on the impact on the COVID-19 pandemic on Internet use. The approach to the analysis used real time streaming telemetry from Communication Service Provider (CSP) backbone and aggregation routers and the…