Thomas Eizinger 55304b3d2a refactor(snownet): learn host candidates from TURN traffic (#9998)
Presently, for each UDP packet that we process in `snownet`, we check if
we have already seen this local address of ours and if not, add it to
our list of host candidates. This is a safe way for ensuring that we
consider all addresses that we receive data on as ones that we tell our
peers that they should try and contact us on.

Performance profiling has shown that hashing the socket address of each
packet that is coming in is quite wasteful. We spend about 4-5% of our
main thread time doing this. For comparison, decrypting packets is only
about 30%.

Most of the time, we will already know about this address and therefore,
spending all this CPU time is completely pointless. At the same time
though, we need to be sure that we do discover our local address
correctly.

Inspired by STUN, we therefore move this responsibility to the
`allocation` module. The `allocation` module is responsible for
interacting with our TURN servers and will yield server-reflexive and
relay candidates as a result. It also knows, what the local address is
that it received traffic on so we simply extend that to yield host
candidates as well in addition to server-reflexive and relay candidates.

On my local machine, this bumps us across the 3.5 Gbits/sec mark:

```
Connecting to host 172.20.0.110, port 5201
[  5] local 100.93.174.92 port 57890 connected to 172.20.0.110 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   319 MBytes  2.67 Gbits/sec   18    548 KBytes       
[  5]   1.00-2.00   sec   413 MBytes  3.46 Gbits/sec    4    884 KBytes       
[  5]   2.00-3.00   sec   417 MBytes  3.50 Gbits/sec    4   1.10 MBytes       
[  5]   3.00-4.00   sec   425 MBytes  3.56 Gbits/sec  415    785 KBytes       
[  5]   4.00-5.00   sec   430 MBytes  3.60 Gbits/sec  154    820 KBytes       
[  5]   5.00-6.00   sec   434 MBytes  3.64 Gbits/sec  251    793 KBytes       
[  5]   6.00-7.00   sec   436 MBytes  3.66 Gbits/sec  123    811 KBytes       
[  5]   7.00-8.00   sec   435 MBytes  3.65 Gbits/sec    2    788 KBytes       
[  5]   8.00-9.00   sec   423 MBytes  3.55 Gbits/sec    0   1.06 MBytes       
[  5]   9.00-10.00  sec   433 MBytes  3.63 Gbits/sec    8   1017 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-20.00  sec  8.21 GBytes  3.53 Gbits/sec  1728             sender
[  5]   0.00-20.00  sec  8.21 GBytes  3.53 Gbits/sec                  receiver

iperf Done.
```
2025-07-28 21:38:39 +00:00
2024-02-27 23:56:46 +00:00

firezone logo

A modern alternative to legacy VPNs.


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Overview

Firezone is an open source platform to securely manage remote access for any-sized organization. Unlike most VPNs, Firezone takes a granular, least-privileged approach to access management with group-based policies that control access to individual applications, entire subnets, and everything in between.

architecture

Features

Firezone is:

  • Fast: Built on WireGuard® to be 3-4 times faster than OpenVPN.
  • Scalable: Deploy two or more gateways for automatic load balancing and failover.
  • Private: Peer-to-peer, end-to-end encrypted tunnels prevent packets from routing through our infrastructure.
  • Secure: Zero attack surface thanks to Firezone's holepunching tech which establishes tunnels on-the-fly at the time of access.
  • Open: Our entire product is open-source, allowing anyone to audit the codebase.
  • Flexible: Authenticate users via email, Google Workspace, Okta, Entra ID, or OIDC and sync users and groups automatically.
  • Simple: Deploy gateways and configure access in minutes with a snappy admin UI.

Firezone is not:

  • A tool for creating bi-directional mesh networks
  • A full-featured router or firewall
  • An IPSec or OpenVPN server

Contents of this repository

This is a monorepo containing the full Firezone product, marketing website, and product documentation, organized as follows:

Quickstart

The quickest way to get started with Firezone is to sign up for an account at https://app.firezone.dev/sign_up.

Once you've signed up, follow the instructions in the welcome email to get started.

Frequently asked questions (FAQ)

Can I self-host Firezone?

Our license won't stop you from self-hosting the entire Firezone product top to bottom, but our internal APIs are changing rapidly so we can't meaningfully support self-hosting Firezone in production at this time.

If you're feeling especially adventurous and want to self-host Firezone for educational or hobby purposes, follow the instructions to spin up a local development environment in CONTRIBUTING.md.

The latest published clients (on App Stores and on releases) are only guaranteed to work with the managed version of Firezone and may not work with a self-hosted portal built from this repository. This is because Apple and Google can sometimes delay updates to their app stores, and so the latest published version may not be compatible with the tip of main from this repository.

Therefore, if you're experimenting with self-hosting Firezone, you will probably want to use clients you build and distribute yourself as well.

See the READMEs in the following directories for more information on building each client:

How long will 0.7 be supported until?

Firezone 0.7 is currently end-of-life and has stopped receiving updates as of January 31st, 2024. It will continue to be available indefinitely from the legacy branch of this repo under the Apache 2.0 license.

How much does it cost?

We offer flexible per-seat monthly and annual plans for the cloud-managed version of Firezone, with optional invoicing for larger organizations. See our pricing page for more details.

Those experimenting with self-hosting can use Firezone for free without feature or seat limitations, but we can't provide support for self-hosted installations at this time.

Documentation

Additional documentation on general usage, troubleshooting, and configuration can be found at https://www.firezone.dev/kb.

Get Help

If you're looking for help installing, configuring, or using Firezone, check our community support options:

  1. Discussion Forums: Ask questions, report bugs, and suggest features.
  2. Join our Discord Server: Join live discussions, meet other users, and chat with the Firezone team.
  3. Open a PR: Contribute a bugfix or make a contribution to Firezone.

If you need help deploying or maintaining Firezone for your business, consider contacting our sales team to speak with a Firezone expert.

See all support options on our main support page.

Star History

Star History Chart

Developing and Contributing

See CONTRIBUTING.md.

Security

See SECURITY.md.

License

Portions of this software are licensed as follows:

  • All content residing under the "elixir/" directory of this repository, if that directory exists, is licensed under the "Elastic License 2.0" license defined in "elixir/LICENSE".
  • All third party components incorporated into the Firezone Software are licensed under the original license provided by the owner of the applicable component.
  • Content outside of the above mentioned directories or restrictions above is available under the "Apache 2.0 License" license as defined in "LICENSE".

WireGuard® is a registered trademark of Jason A. Donenfeld.

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