Category Archives for "Potaroo blog"

BGP in 2022 – BNGP Updates

The first part of this report looked at the size of the routing table and looked at some projections of its growth for both IPv4 and IPv6. However, the scalability of BGP as the Internet’s routing protocol is not just dependant on the number of prefixes carried in the routing table. Dynamic routing updates are also part of this story. If the update rate of BGP is growing faster than we can deploy processing capability to match then the routing system will lose coherence, and at that point the network will head into periods of instability. This second part of the report will look at the profile of BGP updates across 2022 to assess whether the stability of the routing system, as measured by the level of BGP update activity, is changing.

BGP in 2022 – The Routing Table

This past year marks a significant point in the evolution of the Internet where the strong growth numbers that were a constant feature of the past thirty years are simply not present in the data. The Internet’s growth is slowing down significantly. Have we got to the point of market saturation and there is no more demand capacity to fuel further growth? Or are we reeling from the combinations of a global pandemic, turmoil in energy markets and the signs of increased climate instability so that we are no longer as interested to throw more resources into more network infrastructure investment? Let’s take a look at the BGP view of 2022 and see how these larger economic and social considerations are reflected in the behaviour of the Internet’s inter-domain routing system.

Is Secured Routing a Market Failure?

The Internet largely operates in a space defined by markets rather than an intricate framework of regulation. Using a lens of market dynamics and looking at the level to which market-based incentives exist for actors, is the adoption of routing security heading in the direction of market failure? If so, then how should we respond?

The DNS at the IGF

I was invited to participate in a session at IGF 2022 that was devoted to the workings of the DNS. I’d like to share my contribution to this session with my thoughts on where the DNS is headed.

Looking at Centrality in the DNS

Many aspects of the digital environment are dominated by a small clique of extremely large enterprises. Meta and Twitter may be teetering at the moment, but we have Google, Apple, Microsoft and Amazon who are still strongly dominant in their respective markets. Looking further afield, what about our common infrastructure services that everyone is forced to rely upon? How's the Domain Name System faring? Is the DNS also falling under the influence of these digital hypergiants? Or is the DNS still highly distributed and resisting the trends of centralization? Lets take a look at some DNS data to see if we can answer this question.

Going Dark

There has been a concerted push to shroud many of the IETF's core protocols inside a claok of end-to-end encryption. This level of occlusion of the transactions that occur across the network from the network itself is not without its attendant risks, as Dr Paul Vixie outlined in a presentation at the recent NANOG 86 meeting.

Comparing QUIC and TCP

QUIC could be seen as a simple update to TCP, but I think that such a vew is missing the point of QUIC. QUIC represents a significant shift in the set of transport capabilities available to applications in terms of communication privacy, session control integrity and flexibility.

Walking the Policy Tightrope

In policy work nothing is ever truly simply black and white. The means to achieve one outcome may well act to impair the work to achieve different outcomes, and the resultant effort often requires some difficult decisions to balance what appears to be some fundamental tensions between various policy objectives. Even a topic like online safety, which should be very straightforward, has some challenges.

DNS Evolution: Innovation or Fragmentation?

How should we engage with evolution and innovation in the Internet’s name space? How can we evolve this name environment if we avoid fragmentation and stay within the confines of the incumbent name system? Are all that we are permitted to vary when we try to innovate in the name space are the values of the labels used within DNS names? This was never a satisfactory answer, and many actors have experimented with various forms of alternative name systems running over the Internet for many years. These efforts inevitably result in a fragmented name space. Is there a better way to respond to these conflicting pressures?


One of the discussion topics at the recent ICANN 75 meeting was an old favourite of mine, namely the topic of Internet Fragmentation. Here, I’d like to explore this topic in a little more detail and look behinds the kneejerk response of declaiming fragmentation as bad under any and all circumstances. Perhaps there are more subtleties in this topic than simple judgements of good or bad.

Sender Pays

The entire set of issues of network neutrality, interconnection and settlements, termination monopolies, cost allocation and infrastructure investment economics is back with us again. This time it’s not under the banner of “Network Neutrality,” but under a more directly confronting title of “Sender Pays”. The principle is much the same: network providers want to charge both their customers and the content providers to carry content to users.

A Second Look at QUIC Use

A couple of months ago, in July 2022, I wrote about our work in measuring the level of use of QUIC in the Internet. Getting this measurement “right” has been an interesting exercise, and it’s been a learning experience that I’d like to relate here. We’ll start from the end of the previous article and carry on from there.

DoH, DoT and plain old DNS

We’d like to understand the extent to which encrypted DNS technologies have been taken up in the public Internet. To this end, we've been able to analyse the query data from a large open recursive resolver system to provide some insights as to how much use is being made of DNS over HTTPS and DNS over TLS.

Notes from IETF114

IETF114 was held in the last week of July 2022 as a hybrid meeting, with the physical meeting being held in Philadelphia. Here’s my notes on topics that attracted my interest from the week.

Bigger, Faster, Better (and Cheaper!)

There has been much speculation on the evolution of the Internet. Is our future somewhere out there in the blockchains? Is it all locked up in crypto? Or will it all shatter under the pressure of fragmentation? It seems to me that all this effort is being driven by a small number of imperatives: making it bigger, faster and better. Oh, and making it cheaper as well!

Notes from DNS OARC 38

There is still much in the way the DNS behaves that we really don't know, much we would like to do that we can't do already, and much we probably want to do better. DNS-OARC Meetings bring together a collection of people interested in all aspects of the DNS, from its design through to all aspects of its operation, and the presentations and discussions at OARC meetings touch upon the current hot topics in the DNS today.