how-quic

Measuring end-to-end QUIC RTT from QUIC's spin bit. In this way, we can observe the end-to-end RTT, even as a middleman. Run it in a proxy machine, load balancer, router, etc., and we can observe end-to-end RTT.

Written in C with libpcap library.

warning: To anyone who sees this, please note this project is written with learning goal, not production goal.

How to build

Install dependencies:

sudo apt-get install -y gcc make libpcap-dev uthash-dev

Clone and build:

git clone https://github.com/adikabintang/how-quic.git --recurse-submodules
cd how-quic
make

How to run

To see the helper, run:

./how-quic

Opening the network interface require sudo permission, therefore we need sudo. For example:

sudo ./how_quic.out -i enp0s9 -p 4433

Dependencies

1. libpcap
2. log.c
3. Criterion unit test
4. uthash

Limitations

• The memory consumption always grows as the number of connections grow
  • I don't know how to clear previous connection as the QUIC's connection close is in QUIC payload, which is encrypted (reference)
  • I tried to see what Wireshark is doing for this, but it looks like Wireshark also does the same: it does not clear the previous connection (reference and reference).
• Not yet implemented: valid edge counter (is it on draft yet? https://www.ietfjournal.org/enabling-internet-measurement-with-the-quic-spin-bit/)