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Networking Reinvented

Cjdns implements an encrypted IPv6 network using public-key cryptography for
address allocation and a distributed hash table for routing. This provides
near-zero-configuration networking, and prevents many of the security and
scalability issues that plague existing networks.


23:26 <@jercos> well, cjdns is now officially more reliable than the open
                internet for getting to my cheaper VPSes :|

12:52 < mariner> so i don't know if it's been done before, and i assume it's
                 obvious, but I think it's neat. Currently on hype from an

00:36 < tester> man sites take so long to load on i2p
00:36 < tester> i value speed over anonymity any day

<DuoNoxSol> it's notably more reliable than the normal internet
<DuoNoxSol> even though it really really shouldn't be
<DuoNoxSol> seeing as the connections are largely over the normal internet

How close is it to complete?

Hyperboria is the largest cjdns network, with hundreds of active nodes
around the world.

Cjdns has been tested on x86, amd64, ARMv5, ARMv7, MIPS, and PowerPC.
It's continually tested on Linux, FreeBSD, OS X, and Illumos

The protocols and algorithms are experimental and subject to change.
To minimize the harm to the network, please update your cjdns nodes often.

You can help!

We are in need of some buildbots on more obscure systems and architectures.
If you would like to donate one, you could mail it, or you could administer
it and provide remote shell access. Please email ``
if you'd like to help out.

How does routing work?

In a cjdns network, a packet goes to a router and the router labels the packet
with directions to the router best able to handle it. That is, a router which
is physically nearby and has an address numerically close to the destination
address of the packet. The directions are added to the packet to allow it to go
through a number of routers with minimal handling, a verifiable form of source
. They just read the label and bounce the packet wherever the next bits
in the label tell them to. Routers have a responsibility to "keep in touch"
with other routers that are physically close by and numerically near to their

The router engine is a modified implementation of the Kademlia distributed
hash table.



Advanced configuration:


Available here

Thank you for your time and interest,

The cjdns developers.

How to install cjdns

These instructions are for Debian-based Linux distributions and OS X. They should be
informative enough for use on other distributions - just don't expect them to
work verbatim.

0. Install dependencies

On both platforms, installing Node.js, although preferable,
is not strictly necessary. If Node.js is unavailable or an unacceptable version,
it will be downloaded and installed in the source tree.

Debian-based distro:

sudo apt-get install nodejs git build-essential


On OS X, you must install the Command Line Developer Tools. If
you already have a recent version of Xcode (>= OS X 10.9 and >= Xcode 5.0.1), run the
following command:

xcode-select --install

If Xcode is not installed, you can either install it through the App
Store and run the command above, or make a free Apple Developer account here:
Then sign in, search for Command Line Tools, and install the latest package
compatible with your version of OS X. If you encounter issues, there is a
thorough stackoverflow post on installing
the Command Line Tools.

You must also install git and Node.js. There are a few options. If you use Homebrew:

brew install git nodejs

If you use Macports:

sudo port install git-core nodejs

Or if you use neither and would like to install the binaries from their websites:


Sadly, OpenBSD is a bit experimental right now.

pkg_add git node gcc gmake bash

Select version gcc-4.8.1p2 or more recent.

1. Retrieve cjdns from GitHub

Clone the repository from GitHub and change to the source directory:

git clone cjdns
cd cjdns

2. Build


Look for Build completed successfully, type ./cjdroute to begin setup., then
proceed below:


Run cjdroute without options for HELP:


0. Make sure you've got the stuff.

cat /dev/net/tun

If it says: cat: /dev/net/tun: File descriptor in bad state Good!

If it says: cat: /dev/net/tun: No such file or directory, create it using:

sudo mkdir /dev/net &&
sudo mknod /dev/net/tun c 10 200 &&
sudo chmod 0666 /dev/net/tun

Then cat /dev/net/tun again.

If it says: cat: /dev/net/tun: Permission denied You're probably using a VPS
based on the OpenVZ virtualization platform. Ask your provider to enable the
TUN/TAP device - this is standard protocol so they should know exactly what you
need. If you're on OS X, don't worry about this step.

1. Generate a new configuration file

./cjdroute --genconf >> cjdroute.conf

Protect your conf file! A lost conf file means you lost your password and
connections and anyone who connected to you will no longer be able to connect.
A compromised conf file means that other people can impersonate you on the

To set generate a conf file with permissions set so that only your user can
read it and write to it:

(umask 077 && ./cjdroute --genconf > cjdroute.conf)

2. Find a friend

To get into an existing network (e.g. Hyperboria), you need to connect to
someone who is already in the network. This is required for a number of

  1. It helps prevent abuse because bad people will be less likely to abuse a
    system after they were, in an act of human kindness, given access to that
  2. This is not intended to overlay The Old Internet, it is intended to replace
    it. Each connection will in due time be replaced by a wire, a fiber optic
    cable, or a wireless network connection.
  3. In any case of a disagreement, there will be a "chain of friends" linking
    the people involved so there will already be a basis for coming to a

To find a friend, get out there and join our community. Also, have
a look at the Project Meshnet Map to find peers near you (note: scroll the
map right, not left; the markers don't repeat).

3. Connect your node to your friend's node

To initiate the connection OUTbound

In your conf file, you will see:

// Nodes to connect to.
    // Add connection credentials here to join the network
    // Ask somebody who is already connected.

A conf file with multiple friend-nodes, setup OUTbound, should look like:

// Nodes to connect to.
    //friend_1 (IPv4:; IPv6 fcaa:5bac:66e4:713:cb00:e446:c317:fc39)
        "password": "thisIsNotARealConnection_1",
        "publicKey": "thisIsJustForAnExampleDoNotUseThisInYourConfFile_1.k"

    //friend_2 (IPv4:; IPv6 fcbb:5bac:66e4:713:cb00:e446:c317:fc39)
        "password": "thisIsNotARealConnection_2",
        "publicKey": "thisIsJustForAnExampleDoNotUseThisInYourConfFile_2.k"

You can add as many connections as you want to the connectTo attribute,
following JSON syntax.

To allow your friend to initiate the connection INbound

In your conf file, you will see:

        // A unique string which is known to the client and server.
        {"password": "thisisauniquestring_001"}

        // More passwords should look like this.
        // {"password": "thisisauniquestring_002"}
        // {"password": "thisisauniquestring_003"}
        // {"password": "thisisauniquestring_004"}

        // "":{"password": "thisisauniquestring_001","publicKey":thisisauniqueKEY_001.k"}


A conf file with multiple friend-nodes, setup INbound, should look like:

        // A unique string which is known to the client and server.
        {"password": "thisisauniquestring_001"}

        // More passwords should look like this.
    //friend_3 (IPv4:; IPv6 fcaa:5bac:66e4:713:cb00:e446:c317:fc39)
{"password": "thisisauniquestring_002"}
    //friend_4 (IPv4:; IPv6 fcbb:5bac:66e4:713:cb00:e446:c317:fc39)
{"password": "thisisauniquestring_003"}
        // {"password": "thisisauniquestring_004"}

        // "":{"password": "thisisauniquestring_001","publicKey":thisisauniqueKEY_001.k"}


You need to give friend_3 (who is making the INbound connection) the following 4 items:

  1. Your external IPv4
  2. The port found in your conf file here:

             `// Bind to this port.
             "bind": "",`
  3. Their unique password that you uncommented or created: "password": "thisisauniquestring_002"

  4. Your public key: "publicKey":thisisauniqueKEY_001.k"

Please note that you and your friend can initiate a
connection either outbound (from YOU --> FRIEND) or inbound (from FRIEND --> YOU)
but traffic flows both ways once the connection is established.

See doc/ for more details on configuration,
including how to peer with other cjdns nodes over ethernet and wifi.

4. Secure your system - check for listening services

Once your node is running, you're now a newly minted IPv6 host. Your operating
system may automatically reconfigure network services to use this new address.
If this is not what you intend, you should check to see that you are not
offering more services then you intended to. ;)

See doc/ for instructions.

5. Start it up!

sudo ./cjdroute < cjdroute.conf

If you want to have your logs written to a file:

sudo ./cjdroute < cjdroute.conf > cjdroute.log

To stop cjdns:

sudo killall cjdroute

If you are having problems use killall cjdroute to return to sanity. Use
pgrep cjdroute or top to see if it running.

Note: this starts cjdns as the root user so it can configure your system
without concern for permissions. To start cjdns as a non-root user, see

6. Get in IRC

Welcome to the network! You're now a network administrator. There are
responsibilities which come with being a network administrator which include
being available in case there is something wrong with your equipment. You should
stay on IRC so that people can reach you.

Admin interface

When cjdnroute is up and running, the admin interface will be available at
udp://localhost:11234 (this can be changed in the cjdroute.conf
configuration file). See admin/ for more
information about the admin interface. There are several tools in contrib/
that can interact with it.

You can access the admin API with:

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