STUN/TURN server written in Elixir
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MongooseICE is a STUN server by Erlang Solutions whose internals aim to be well written and tested.


Many modern applications (mobile and web) are media intensive like those involving audio, video, gaming, and file transfer. MongooseICE helps to get communication done peer-to-peer (without going through a server) so your bandwidth and server-side costs don't need to be as much of a concern.


Some helpful technical material:

  • For the bigger picture see the RTCPeerConnection plus servers section under this tutorial
  • MongooseICE alone isn't enough to get peer-to-peer communication going. The reason why is described in this tutorial. Our XMPP server, MongooseIM, is perfect for building a combination of signaling and chat applications
  • Find the STUN, TURN, and ICE RFCs (at the IETF site)

Installation as part of other application

MongooseICE is available on Hex. To use it, just add it to your dependencies:

def deps do
    {:mongooseice, "~> 0.4.0"}

Installation as standalone service

For now there are two ways of starting MongooseICE as standalone application. Via release built from source or via prebuilt docker image. The docker image could be used for production system with a proper network setup (the easiest one would be --net=host docker option). For developement on non-docker-native platforms it is probably easier to start the built release then setup docker container to work correctly. This is due to the fact that TURN server uses system ephemeral port pool for allocations, which is not so easy to map to the host machine. This issue is not visible on Linux systems, since you can allow docker to use its private virtual network and just use the docker container's IP address as the relay IP (which is set this way in MongooseICE by default when using the docker image).

Building and using a release

You may build the release and use it on production system. In order to do that, just type:

MIX_ENV=prod mix do deps.get, release

The release can be configured by environment variables described in Configuration section below.

Using docker prebuilt container

You can use our prebuilt docker images on our dockerhub:

docker run -it -p 3478:3478/udp -e "MONGOOSEICE_STUN_SECRET=very_secret" mongooseim/mongooseice

This command will start the MongooseICE server with default configuration and with STUN secret set to very_secret. If you are using this on Linux, the part with -p 3478:3478/udp is not needed, since you can access the server directly using the container's IP. You can configure the server by passing environment variables to the container. All those variables are described in Configuration section below.

Building docker container

Well, that's gonna be quite simple and short:

MIX_ENV=prod mix do deps.get,, docker.release

And that's it. You have just built MongooseICE's docker image. The name of the image should be visible at the end of the output of the command you've just run. You can configure the container by setting environment variables that are described in Configuration section below.


Assuming you are using release built with env prod or the docker image, you will have access to the following system's environment viaribles:

General configuration
  • MONGOOSEICE_LOGLEVEL - debug/info/warn/error - Log level of the application. info is the default one
  • MONGOOSEICE_UDP_ENABLED - true/false - Enable or disable UDP STUN/TURN interface. Enabled by default
  • MONGOOSEICE_TCP_ENABLED - true/false - Not yet supported - Enable or disable TCP STUN/TURN interface. Disabled by default.
  • MONGOOSEICE_STUN_SECRET - Secret that STUN/TURN clients have to use to authorize with the server
UDP configuration

The following variables configure UDP STUN/TURN interface. It must be enabled via MONGOOSEICE_UDP_ENABLED=true in order for those options to take effect.

  • MONGOOSEICE_UDP_BIND_IP - IP address on which MongooseICE listens for requests. Release default is, but in case of docker container the default is
  • MONGOOSEICE_UDP_PORT - Port which server listens on for STUN/TURN requests. Default is 3478
  • MONGOOSEICE_UDP_REALM - Realm name for this MongooseICE server as defined in TURN RFC. Default: udp.localhost.local
  • MONGOOSEICE_UDP_RELAY_IP - IP of the relay interface. All allocate requests will return this IP address to the client, therefore this cannot be set to Release default is, but in case of docker container the default is set to the first IP address returned by hostname -i on the container.
TCP configuration

TCP is not yet supported.

Checklist of STUN/TURN methods supported by MongooseICE

  • Binding
  • Allocate
  • Refresh
  • Send
  • Data
  • CreatePermission
  • ChannelBind

Checklist of STUN/TURN attributes supported by MongooseICE

Comprehension Required

  • DATA

Comprehension Optional



Copyright 2017 Erlang Solutions Ltd.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.