ben@benjojo.co.uk, Author at NetworkingNexus.net

Yubikey/Smartcard backed TLS servers

It has become clear that storing secrets in computers is hard. The best demo to the world that storing secrets on “online” computers is hard and sometimes

Making art with SSH key randomart

SSH is everywhere in the development or operations world now. For development it’s what allows you to push to GitHub. For operations it’s what allows you to reasonably securely log into Linux servers.

SSH

Mapping the whole internet with Hilbert curves

Translations are available in:

Encoding data in dubstep drops

[Warning: Those who can’t stand EDM/dubstep, oh boy do I have bad news for you in regards to this blog post]

Dubstep songs are often criticized as sounding extremely computer generated and often just too aggressi

Giving every Tor Hidden Service a IPv6 address

Tor has a neat feature called Onion Services [(A)](https://web.archive.org/web/20180330000120/https://www.torproject.org/docs/onion-services.h

DNSFS. Store your files in others DNS resolver caches

A while ago I did a blog post about how long DNS resolvers hold results in cache for, using RIPE Atlas probes testing against their default resolvers (in a lot of cases, the DNS cache on their m

A surprising amount of people want to be in North Korea

While the president of the United States and the leader of North Korea were/are currently beefing on Twitter about who should destroy the world first, North Korea was also causing me some pers

Email delivery is stuck on IPv4

Generally speaking there is nothing that people want to talk about less than email delivery and for good reason, Email is continuously seen as one of those archaic protocols that everyone wants to improve but unfortu

Traceroute Haiku’s

Sometimes I like to think that I do “serious” blog posts like “The strange case of ICMP Type 69 on Linux” or [“Anycast possibly done better”](https://blog.benjojo.co.uk/post

IP over AX.25 over 802.11 with ESP8266

I love obscure protocols, and while most of the world’s legacy X.25 equipment is slowly being shut down. It’s amateur radio derivative AX.25 is getting along pretty wel

IPv6 anycast possibly done better

Anycasting IP space has become quite a meme in the networking world in the last few years, with it being used sparsely in the past for UDP based services like DNS. Now it’s being used for TCP based services too,

Building a legacy search engine for a legacy protocol

Translations are availa

Just how long do DNS resolvers cache last?

I’m sure this has been done before, but you do hear stories from time to time where someone will either drop or increase their DNS TTL’s and either see a massive difference, or none at all.

A lot of pro

Monitoring SNMP less devices with ease

In the consumer world you will likely encounter networking devices that don’t have a easy way to poll for their network stats, or in some cases you hate <abbr style=“border-bottom: 1px dotted green;” title=“S

Ludicrously cheap HDMI capture for Linux

Lately I have had the need to do real time video capture from HDMI devices as o

TOTP SSH port fluxing

Some people change their SSH port on their servers so that it is slightly harder to find for bots or other nasties and while that is generally viewed as an action of [security through obscurity](https://en.wikipedia.org/wiki/S

I may be the only evil (bit) user on the internet

Almost every year a joke RFC is made on April 1st (these have caught on so well, that it’s now common to see more than one of these every year

The strange case of ICMP Type 69 on Linux

A collectd graph showing IMCP types

I run collectd stats on many of my servers and one thing I enable on some (but not all) of the

robots.txt usage over the Alexa million

If you ever had to deal with bots while running a site you will have at least at some point looked into robots.txt, a system that isn’t rea

Propagation slow? Sound the alarms!

This is a blog post that I had written for my employer CloudFlare You can find the full link here

CloudFlare operates a

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