I've been doing packet analysis for a while now. Wireshark is almost always my first port of call when something's wrong on the wire. (Pun intended.) At some point, though, you'll want to go beyond a GUI. You want to write your own tooling, create your own dissection logic, and own the entire pipeline. And that's where Rust comes in. This post covers how I approached building a packet parser using both the pcap and pnet crates, what each one does, why you need both, and what Rust's ownership model actually means in this context. Why Rust for Packet Parsing? The obvious answer is performance. Rust gives you zero-cost abstractions and no garbage collector, which matters when you're parsing high-volume traffic and every microsecond counts. But honestly, what hooked me was something different: Rust forces you to be explicit about memory , and packet parsing is a domain where sloppiness gets you immediately.…