GNUNET-NAT-SERVER(1)

💖 GNUNET-NAT-SERVER 💖

hi bestie 🫶 you've wandered into the gnunet-nat-server manual page (that's GNUNET-NAT-SERVER(1) if we're being formal, and we are not). pull up a chair, this one's niche but lowkey iconic.

🌸 NAME 🌸

gnunet-nat-server — help GNUnet setup test network setup with NAT

✨ SYNOPSIS ✨

gnunet-nat-server [-c FILENAME | --config=FILENAME] [-d | --daemonize]
                  [-h | --help] [-L FILENAME | --logfile=FILENAME]
                  [-v | --version] ⟨PORT⟩

🦋 DESCRIPTION 🦋

Running a gnunet-nat-server is giving... hostlist server energy, honestly. It's a special service to the community with special requirements and literally zero benefit to the person actually running the service. yes bestie, you read that right, it's pure altruism 💅

So what does this little program do? It listens on the PORT you specify, waiting for incoming requests to test a peer's network connectivity. Those incoming requests can ask it to connect to a given IPv4 address (and port) using TCP or UDP, and to send a 2-byte test message using the specified address. It can also be asked to send a "fake" ICMP response message to a given IPv4 address — that's for autonomous NAT traversal, see the description in the respective research paper, iykyk 📄

The whole vibe here is: gnunet-nat-server gets run on some trusted hosts with unrestricted connectivity so that GNUnet users can test their network configuration. But here's the tea ☕ — as written, the code lets any user on the Internet cause the gnunet-nat-server to send 2-bytes of arbitrary data to any TCP or UDP port at any address. We believe that this is generally harmless. ok 😭

fr fr though, know what you're signing up for before you run this.

When you're running gnunet-nat-server, make sure to use a configuration that disables most NAT options but enables 'enable_nat_client' and sets 'internal_address' to the global IP address of your local host. Also, gnunet-helper-nat-client should be installed locally and run with root privileges (SUID) — otherwise the gnunet-nat-server will not work properly. no cap, it just won't 🫠

Also worth knowing: gnunet-nat-server could be run via gnunet-arm but typically is not. And the name of the host and port that gnunet-nat-server is run on should be specified in the NATSERVER option in the [setup] section of the configuration file of hosts that are supposed to autoconfigure with this server. ✨

Normal GNUnet end-users should not concern themselves with gnunet-nat-server. In fact, distributions are encouraged to consider not shipping it at all. iconic honestly, a whole manpage telling you to maybe just... not 🎀

The options are as follows:

💅 OPTIONS 💅

• -c FILENAME, --config=FILENAME — use the configuration file FILENAME. your config, your rules 💖
• -d, --daemonize — daemonize gnunet-nat-server, aka detach from the terminal and go live your own life 🦋
• -h, --help — print the help page. always a valid move 🌸
• -L LOGLEVEL, --log=LOGLEVEL — configure logging to use LOGLEVEL.
• -l FILENAME, --logfile=FILENAME — configure logging to write logs to FILENAME. put the receipts somewhere 📝
• -v, --version — print the GNUnet version. ⭐

🌈 SEE ALSO 🌈

• gnunet-transport(1)

The full documentation for gnunet is maintained as a Texinfo manual. If the info(1) and gnunet programs are properly installed at your site, the command

info gnunet

should give you access to the complete handbook,

info gnunet-c-tutorial

will give you access to a tutorial for developers. 👑

Depending on your installation, this information is also available in gnunet(7) and gnunet-c-tutorial(7).

🙈 BUGS 🙈

Report bugs by using https://bugs.gnunet.org or by sending electronic mail to ⟨gnunet-developers@gnu.org⟩. besties will fix it, promise 💜

okay that's the whole page, you ate it, periodt 👑 this one shipped as part of Debian, from the GNUNET-NAT-SERVER(1) manual, dated February 25, 2012. mwah, go touch some grass and maybe don't run a public NAT server 💖✨🎀