networking

Networking and distributed systems protocols implemented from scratch in Rust. Each project takes a canonical networking problem and builds a working implementation from first principles, following RFCs and papers rather than textbook summaries.

Projects

tcp-over-udp

A complete TCP-like reliable transport stack running over UDP sockets. Implements the 3-way handshake, sliding window (Go-Back-N + Selective Repeat), SACK, TCP Reno congestion control, RTT estimation (RFC 6298), flow control with persist timer, Nagle's algorithm, and full connection teardown — all verified against a pluggable fault-injection simulator.

~8,000 lines | 160+ tests | 16 modules

dns-resolver

An iterative DNS resolver that starts from the 13 IANA root servers and walks the hierarchy (root → TLD → authoritative) to resolve domain names. Handles binary packet encoding/decoding (RFC 1035), name compression, CNAME chains, UDP with TCP fallback, and TTL-based LRU caching with negative cache support.

~2,300 lines | CI/CD pipeline

gossip-membership

A SWIM-style gossip membership protocol where nodes discover peers, detect failures via direct + indirect probes, and maintain a consistent cluster view through epidemic dissemination. Features ChaCha20-Poly1305 encryption, anti-entropy full-table sync, adaptive fanout, rate limiting, and a Prometheus/Grafana observability stack.

~6,600 lines | 250+ tests | property tests | fuzz targets | benchmarks

Building

Each project is a standalone Cargo package — no workspace. Build and test independently:

cd tcp-over-udp && cargo test
cd dns-resolver && cargo test
cd gossip-membership && cargo test

Structure

networking/
├── tcp-over-udp/          # TCP over UDP (transport layer)
├── dns-resolver/           # Iterative DNS resolver (application layer)
└── gossip-membership/      # SWIM gossip protocol (distributed systems)