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# Yggdrasil

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Yggdrasil is an early-stage implementation of a fully end-to-end encrypted IPv6 network. It is lightweight, self-arranging, supported on multiple platforms, and allows pretty much any IPv6-capable application to communicate securely with other Yggdrasil nodes.

This article describes how to set up and use Yggdrasil.

## Installation

Install the yggdrasil package.

## Running

Start/enable `yggdrasil.service`.

This will create a `tun` network interface and make available two new IPv6 network interfaces. The important one starts with `200:` which is what your machine will be known as in the Yggdrasil network. This IP address is using a reserved part of the IPv6 standard. This avoids any conflicts with the wider Internet.

To test this works you can run:

    # yggdrasilctl getself

## Configuration

You can create default configuration file `/etc/yggdrasil.conf` by running `yggdrasil-default-config.service`, also it will be created and used by running `yggdrasil.service` first time. By default your Yggdrasil instance will not have any peers and thus you are running a standalone service. Editing the `/etc/yggdrasil.conf` file, which uses the JSON format, allows one to add peers and after restarting the service your node can both reach the wider network, as well as others can find your node.

Tip: You may want to enable a local firewall before peering with the wider network because your machine and all its services will reachable from outside when you do.

More details about the configuration is available in the upstream documentation.

To peer with the wider network, start with the public-peers documentation.

## Local firewall

In todays networking practices a common Linux installation is not exposed directly to the Internet. Only servers will typically have a public IP address. As a result our ssh or similar services are not able to be attacked by anyone and everyone.

It is important to realize that running Yggdrasil and peering it to the wider Yggdrasil network changes this. Services that listen on all network connections will become reachable by anyone that connects to this network. You might want configure them to not listen on the Yggdrasil network or quickly hide running services with a couple of firewall rules.

    /etc/iptables/ip6tables.rules

    #yggdrasil
    *filter
    :INPUT ACCEPT [8:757]
    :FORWARD ACCEPT [0:0]
    :OUTPUT ACCEPT [5:463]
    -A INPUT -i tun0 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
    -A INPUT -i tun0 -m conntrack --ctstate INVALID -j DROP
    -A INPUT -i tun0 -j DROP
    COMMIT

Start/enable `ip6tables.service` to make this take effect.

## See also

- Upstream documentation
- Yggdrasil services
- Wiki of Yggdrasil network users / yggdrasil network link
- Alfis - DNS in Yggdrasil

Category:

- Peer-to-peer