Difference between revisions of "ChaosVPN:OpenWRTHowto"

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(0. Fulfil Requirements)
(0. Fulfil Requirements: typo)
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= 0. Fulfil Requirements =
= 0. Fulfil Requirements =
* Buy Hardware [[http://www.amazon.de/dp/B004YIT2ZI|Netgear WNDR3800]] or some equivalent
* Buy Hardware form [http://wiki.openwrt.org/toh/start this List]
* You must have read the basic [[ChaosVPN::Howto]] precisely
* You have to read the basic [[ChaosVPN::Howto|Howto]] precisely
* generate your keys, choose nodename and subnet and send pubkey to ChaosVPN team
* generate your keys, choose nodename and subnet and send pubkey to ChaosVPN team

Revision as of 20:35, 24 April 2012

This is Howto for setting up an independent Box providing ChaosVPN

-1. Introduction

If someone knows about OpenWRT compiling/packages and is interested in ChaosVPN - contact User:Waldmeister.

As of 2012-04-14

Einziges Problem ist dass die ChaosVPN-Version in OpenWRT knapp 2 Jahre 
alt ist, und sich seit dem doch so einiges getan hat.
(OpenWRT trunk hat v2.0, aktuell ist v2.0.12)


0. Fulfil Requirements

  • Buy Hardware form this List
  • You have to read the basic Howto precisely
  • generate your keys, choose nodename and subnet and send pubkey to ChaosVPN team

Get your new node added to the central configuration

Devise a network-nick and a unique IP range you will be using

This network-nick or sometimes called nodename is the name of the network endpoint/gateway where the vpn software will be running,
not necessarily the name of the user, there may even be more than one gateway per user.

Used below where <nodename> is.

Please use only characters a-z, 0-9 and _ in it. Note that only lowercase letters are supported.

Second please select an unused IPv4 range out of IP Range, and write yourself down in that wiki page to mark your future range as in-use.
Please select from the correct ranges, 172.31.*.* for Europe, and 10.100.*.* for North America and elsewhere.

Repeat: Please do not forget to add yourself to the list at IP Range to mark your range as used.

Used below where <ipv4 subnet in the vpn> is.

The usage of IPv6 networks is also possible, but we do not have a central range for this (yet),
you may specify an IPv6 range you received from your (tunnel) provider to be reachable over the VPN,
or a private IPv6 ULA (Unique Local Address) network described in RFC4193.
For more info about ULA and a network-range generator please also see http://www.sixxs.net/tools/grh/ula/ .

Used below where <ipv6 subnet in the vpn> is.


The gateway may have a DynDNS (or similar) hostname pointing to a dynamic IP, or a static hostname/fixed IP.

Better supply a hostname than a raw IP address even if it is static, so you can change it youself and do not need to contact us when needed. (Perhaps something like chaosvpn.yourdomain.example)

Used below where <clienthost> is.

Generate keys

Generate keys with tinc 1.1+

# tinc --net=chaos init <nodename>

Replace <nodename> with the name your new node should get.

**FIXME** need some way that "tinc init" puts the public key into the seperate files and not only into the generated hosts file, which our chaosvpn daemon overwrites.

generate public/private RSA and ECDSA keypairs with

# tinc --net=chaos generate-keys 2048

press Enter 4 times and backup the files /etc/tinc/chaos/ecdsa_key.priv, ecdsa_key.pub, rsa_key.priv and rsa_key.pub on an external device.

Generate keys with tinc 1.0.xx

create chaos config folder with

# mkdir /etc/tinc/chaos/

generate public/private keypairs with

# tincd --net=chaos --generate-keys=2048

press Enter 2 times and backup the files /etc/tinc/chaos/rsa_key.priv and rsa_key.pub on an external device.

Mail us your Infos

  • send via email to chaosvpn-join@hamburg.ccc.de

We need the following info - but please be so kind and also add a short description of you/your space and your motivation to join chaosvpn - or at least make us laugh. :)

(Please remove all lines starting with # from the email, they are just descriptions)


# Name a person/nickname/nodename or organisation/hackerspace already on ChaosVPN that will
# vouch for you getting access.

# This should be the external hostname or ip address of the client host, not a VPN address.
# If the client is not reachable over the internet leave it out and set hidden=1 below.
# If possible supply a hostname (even dyndns) and not an ip address for easier changing
# from your side without touching the central config.

network=<ipv4 subnet in the vpn>
network6=<ipv6 subnet in the vpn>
# (mandatory, must include)
# this may be more than one, IPv4 or IPv6, network6 with  IPv6 is optional
# These subnets must be unique in our vpn,
# simply renumber your home network (or use something like NETMAP) with a network block that is still free.
# Please use the list of assigned networks on ChaosVPN:IPRanges, and add yourself there.

# (mandatory, must include)
# Admin of the VPN gateway, with email address - a way to contact the responsible
# person in case of problems with your network link.

# (optional)
# if not specified tinc works on tcp+udp port 655
# it is better if everyone chooses a random port for this.
# either this specified port or port 655 should accept TCP and UDP traffic from internet.

# (optional)
# "I cannot accept inbound tunnel connections, I can only connect out."
# (e.g. behind a NAT)
# (optional)
# "I cannot connect out, but you can connect to me."
# Only ONE of hidden=1 or silent=1 is possible. 

# (optional)
# tinc 1.1pre11+ only, contents of your /etc/tinc/chaos/ed25519_key.pub

# (mandatory)
# rsa-public-key - contents of your /etc/tinc/chaos/rsa_key.pub

Awaiting Response, give us some days, your request is processed manually

Retry until $success or $reject - but do not spam us.

1. Preparations

In five steps. Really.

1. Get Started

  • Unpack your Router and power on
  • Connect wired or wireless (use information provided with your router)
  • Go directly to your routers Webinterface ( or and search for sth like System -> Firmware Upgrade
  • (There is no need to change any of the configuration)

2. Install OpenWRT

  • Download [OpenWRT for WNDR3800] and upload the Image in your Webinterface
  • Press Start
  • Wait until done (Power LED should not flash)

3. Start and Setup OpenWRT

  • Restart the network connection between PC <-> Router
  • telnet
  • passwd #set a root password 
  • Connect the yellow (WAN) port on your router to current infrastructure
  • Go to Webinterface at
  • Go to Network -> Interfaces and activate WAN Connection with DHCP or your custom internet configuration
  • Navigate to System -> Software and press Update Lists
  • Press Available Software tab and select C
  • Search for ChaosVPN and press install

(I did also install screen at this point)

4. Prepare for launch

  • ssh root@ # telnet won't work anymore
  • edit the top part of
  • /etc/tinc/chaosvpn.conf
$my_peerid = <nodename>
$my_vpn_ip = 172.31.<your Subnet>.[1-255]
  • Copy over your keys to OpenWRT Box
# scp /etc/tinc/chaos/rsa_key.p* root@
# rm /etc/tinc/chaos/rsa_key.p*

5. Lift off

  • start chaosvpn
  • /etc/init.de/chaosvpn start

...be prepared for 150 new route entries

2. Configure a Moonlander

While building a ChaosVPN-only access node, use either Webclient or [| Console Backup] continously

1. Add Interface for ChaosVPN

  • Go to Network -> Interfaces
  • Klick Add new interface.. Button at the bottom of the page
  • Type ChaosVPN into name field
  • Select Unmanaged
  • Select Ethernet Adapter: "chaos_vpn"
  • Save

2. Add Zone for ChaosVPN

  • Go to Network -> Firewall
  • In the Zones Tab, klick Add
  • Type ChaosVPN into name field
  • At Covered Networks select ChaosVPN

3. Make WLAN an ChaosVPN only AP

Caution! Pozor!

  1. The following is varies with your persional use case - please post your configuration with an short description if you like
  2. The default WAN will be still reachable via wired network.
  3. The wireless network will have no access to WAN - ChaosVPN only.
  4. At any state you can use the IP to reach your router.
  5. Pressing save will only cache the setting - press apply to make sure settings are set

  • Go to Network -> Interfaces
  • Klick Add new interface
  • Type wlan into name field
  • Select Static address
  • Check Create a bridge if you like to bridge 2.4GhZ and 5GhZ
  • Select (both) wlan devices

  • In Edit mask
  •  IPv4 Address: 172.31.<your subnet>.[1-255] //this must not be the ip of chaosvpn device!
  • Netmask:

  • Add a DHCP Server to server some addresses in range 100-150
  • Advanced Settings to propagate internal nameservers
  • DHCP Options: 6,,,
  • Go to Network -> Firewall
  • In the Zones Tab, klick Add
  • Type wlan into name field
  • At Covered Networks select wlan device
  • Check Allow forward to destination zones: ChaosVPN

4. Save & Apply & ReConnect & ReBoot | ReTry

  • ping irc.hackint.hack
  • tests your successful landing with stable communication uplink

... to be continued