Small userspace TCP/IP stack based on TUN devices, implements:

• Handshake
• Sliding window
• Out-of-order packet reassembly
• Retransmissions (including RTO calculation)
• Socket close & reset
• Respect MSS
• Nagle's algorithm
• SWS avoidance
• Zero-Window probes
• Congestion control
• SACK
• Timestamps

Build the project using cargo, setup iptables rules to allow the TUN interface to handle traffic, and run it!

$ cargo build
# ./scripts/iptables_rules.sh
# ./target/debug/tunstack

• Level-IP

• tapip

• rust-tcp

• smoltcp

• tcp_ip

• PicoTCP

• MicroTCP

• Let's code a TCP/IP stack

• Write TCP/IP Stack by Yourself

• RFC - Transmission Control Protocol (TCP)

• RFC - Computing TCP's Retransmission Timer

• RFC - TCP Congestion Control

• RFC - TCP Extensions for High Performance