New playground: memory spy
New playground: memory spy
Introducing "Implement DNS in a Weekend"
Introducing "Implement DNS in a Weekend"
New talk: Learning DNS in 10 years
New talk: Learning DNS in 10 years
New playground: integer.exposed
New playground: integer.exposed
A list of programming playgrounds
A list of programming playgrounds
Building a custom site for zine feedback
Building a custom site for zine feedback
Some possible reasons for 8-bit bytes
Some possible reasons for 8-bit bytes
How do Nix builds work?
How do Nix builds work?
Some notes on using nix
Some notes on using nix
Writing Javascript without a build system
Writing Javascript without a build system
Print copies of The Pocket Guide to Debugging have arrived
Print copies of The Pocket Guide to Debugging have arrived
Why does 0.1 + 0.2 = 0.30000000000000004?
Why does 0.1 + 0.2 = 0.30000000000000004?
Examples of problems with integers
Examples of problems with integers
Examples of floating point problems
Examples of floating point problems
Some business graphs for 2022
Some business graphs for 2022
New zine: The Pocket Guide to Debugging
New zine: The Pocket Guide to Debugging
A debugging manifesto
A debugging manifesto
Tips for analyzing logs
Tips for analyzing logs
A couple of Rust error messages
A couple of Rust error messages
Making a DNS query in Ruby from scratch
Making a DNS query in Ruby from scratch
Why do domain names sometimes end with a dot?
Why do domain names sometimes end with a dot?
How to send raw network packets in Python with tun/tap
How to send raw network packets in Python with tun/tap
Some ways to get better at debugging
Some ways to get better at debugging
A toy remote login server
A toy remote login server
What happens when you press a key in your terminal?
What happens when you press a key in your terminal?
Monitoring tiny web services
Monitoring tiny web services
Notes on running containers with bubblewrap
Notes on running containers with bubblewrap
sqlite-utils: a nice way to import data into SQLite for analysis
sqlite-utils: a nice way to import data into SQLite for analysis
Pages that didn't make it into "How DNS Works"
Pages that didn't make it into "How DNS Works"
New zine: How DNS Works!
New zine: How DNS Works!
A list of new(ish) command line tools
A list of new(ish) command line tools
Implementing a toy version of TLS 1.3
Implementing a toy version of TLS 1.3
Celebrate tiny learning milestones
Celebrate tiny learning milestones
How to use undocumented web APIs
How to use undocumented web APIs
Some tiny personal programs I've written
Some tiny personal programs I've written
Some things about getaddrinfo that surprised me
Some things about getaddrinfo that surprised me
Things that used to be hard and are now easy
Things that used to be hard and are now easy
The multiple meanings of "nameserver" and "DNS resolver"
The multiple meanings of "nameserver" and "DNS resolver"
A toy DNS resolver
A toy DNS resolver
Reasons for servers to support IPv6
Reasons for servers to support IPv6
Hosting my static sites with nginx
Hosting my static sites with nginx
Some ways DNS can break
Some ways DNS can break
How to find a domain's authoritative nameservers
How to find a domain's authoritative nameservers
Why might you run your own DNS server?
Why might you run your own DNS server?
2021: Year in review
2021: Year in review
New tool: Mess with DNS!
New tool: Mess with DNS!
DNS "propagation" is actually caches expiring
DNS "propagation" is actually caches expiring
How to use dig
How to use dig
Debugging a weird 'file not found' error
Debugging a weird 'file not found' error
Some notes on using esbuild
Some notes on using esbuild
How do you tell if a problem is caused by DNS?
How do you tell if a problem is caused by DNS?
How to get useful answers to your questions
How to get useful answers to your questions
Tools to explore BGP
Tools to explore BGP
All my zines are now available in print!
All my zines are now available in print!
New tool: an nginx playground
New tool: an nginx playground
Teaching by filling in knowledge gaps
Teaching by filling in knowledge gaps
Debugging by starting a REPL at a breakpoint is fun
Debugging by starting a REPL at a breakpoint is fun
Quadratic algorithms are slow (and hashmaps are fast)
Quadratic algorithms are slow (and hashmaps are fast)
Write good examples by starting with real code
Write good examples by starting with real code
Reasons why bugs might feel "impossible"
Reasons why bugs might feel "impossible"