linux networking - Paul Carleton's blog

Why does TCP even need a 3-way handshake?

The 3-way handshake. It's inevitable in any TCP discussion that you mention the TCP connection establishment three-way handshake. After writing about QUIC and how it aims to have 0-RTT connection establishment cost, I started wondering why TCP needed that 1-RTT 3-way handshake in the first place.

linux networking

TIL: QUIC is like TLS over UDP

QUIC (Quick UDP Internet Connections) is a new(ish) protocol for developing applications on the internet. It aims to provide TLS-like encryption without the overhead of TCP.

linux networking

TIL: The difference between netstat and ss

Motivation In this post, I'm going to go over two tools for inspecting the socket states (netstat and ss), and why to choose one over the other (spoiler: you can really choose either). This is not going to be a 12 ways to inspect socket states article, there are lots

linux networking

TIL: There are 16 T1 Internet Service Providers

I've been collecting information for a "Practical Guide to Linux Networking" by reading material I can find. Two things I've been reading recently are: A Practical Guide to (Correctly) Troubleshooting with Traceroute a presentation by Richard A Steenbergen Compute Networking: A Top Down Approach a textbook by Kurose

rust

Dumb dig clone in Rust

Why write a DNS client When I started digging in to DNS, I thought it would be interesting to try implementing a very simple DNS client similar to dig, but using Rust. My goal was to better understand DNS at the protocol level. I wanted to know what bytes were

linux networking

Starting to figure out SSL

Introduction I've been slowly working towards a personal finance app, but before I can actually put it on the open web, I want to be reasonably confident that I am not opening myself up to being hacked. One of the pieces to that puzzle is having secure connections in the

linux networking

Meandering History of DNS Authority

As a follow up to my DNS post, I started trying to answer "Who's in charge of all this?". Basically, I wanted to know what keeps me from claiming a different domain name or for that matter for claiming a different IP address. I went down a rabbit

linux networking

DNS End to End

Domain Name System: End to End We all interact with the Domain Name System (DNS) every day. Every time we load a web page, or click a link, our software relies on DNS to figure out what address to send requests to. In this post, I will dig into how