znuh / frivpn


multithreaded openvpn client (WIP)


A multi-threaded openvpn client (WIP)

With Raspberry Pis, ODROIDs and APUs becoming ubiquitous and cheap devices, they are often used and configured as VPN gateways to the Internet. openvpn can't use those devices to their full capacity, since it runs single-threaded and quickly maxes out one CPU core due to the lack of hardware-accelerated AES cryptography.

frivpn is multi-threaded and runs on multiple (all) CPU cores, which results in the best possible VPN bandwidth and throughput.

Device openvpn frivpn
APU.1D ~30 Mbit/s ~60 Mbit/s
ODROID XU4 ~24 Mbit/s ~80 Mbit/s
Raspberry Pi 3 ~?? Mbit/s ~?? Mbit/s


Debian (stretch)

# apt install build-essential lua5.2 lua5.2-dev lua-posix lua-luaossl lua-cqueues libssl-dev liblzo2-dev
$ git clone https://github.com/znuh/frivpn.git
$ cd frivpn
$ make

Run it

The ovpn_client expects a config as the first parameter. See the configs directory for configuration examples.

$ lua ovpn_client.lua configs/ipredator

Troubleshooting & Caveats

While frivpn is generally compatible with any openvpn server, it (currently) requires the server to be configured in the following way:

  • TCP protocol (no UDP support as of now)
  • Server cert, but no client certs
  • Username & password auth
  • tls-auth enabled
  • comp-lzo enabled
  • cipher AES-256-CBC
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