A quick hands-on how to create IPv6 conenctivity at your home.

 

First we have to install additional packages to enable IPv6 on the box. So first: opkg update, then:

Those are basic packages needed for OpenWrt to support IPv6. The typical test if everything went smoothly is using ifconfig command:

BEFORE:

AFTER:

root@OpenWrt:~# ifconfig
br-lan    Link encap:Ethernet  HWaddr 00:23:69:2F:3C:47
          inet addr:192.168.147.9  Bcast:192.168.147.255  Mask:255.255.255.0
          inet6 addr: fe80::223:69ff:fe2f:3c47/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:128963 errors:0 dropped:0 overruns:0 frame:0
          TX packets:586 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:19210054 (18.3 MiB)  TX bytes:53923 (52.6 KiB)

 

Let's make a break. We successfully configured IPv6 connectivity on OpenWRT box. Now it is time to get real IPv6 or even whole subnet. Here I will describe how to do this with SixxS provider. SixxS is so called tunnel broker. They provide you tunnels (IPv6 in IPv4 encapsulation) to give you connectivity. They can also provide you whole IPv6 subnet. So you need to:

• get tunneling (virtual) interface on OpenWRT
• configure your tunneling interface as your local end-point for a tunnel.
• test, if your router had IPv6 connectivity
• configure your router to broadcast your IPv6 PREFIX and to advertise itself as router
  
• test your local network
  

So first we have to add some kernel modules (Kernel support for the TUN/TAP tunneling device): opkg install kmod-tun. The logread should say something like: "Oct  6 16:02:43 OpenWrt user.info kernel: Universal TUN/TAP device driver 1.5 (C)1999-2002 Maxim Krasnyansky". If yes, you have tun interface.

AICCU configuration
I will demonstrate most difficult condition for end-user: having OpenWRT behind firewall in private IPv6 network that has NAT connectivity to IPv4 Internet via DSL line with dynamic public IPv4 IP address. For such setup, we need special tunnel configuration software. Tunnel brokers provide usually their own implementation. Here is the one provided by SixxS: opkg install aiccu:

 
Now we should edit vi /etc/config/aiccu. Just fill the blanks (SixxS handle and password, tunel ID, etc.). For reference, please use aiccu.conf from your windows directory. You probably have this, as I assume, you played first with setting IPv6 on your local Windows machine. When ready, please enable aiccu, by typing: /etc/init.d/aiccu enable. Then restart to ensure that your tunnel is up and running after reboot. Testing is easy. We should be able to do following test:
root@OpenWrt:~# ping6 sixxs.net
PING sixxs.net (2001:1af8:1:f006::6): 56 data bytes
64 bytes from 2001:1af8:1:f006::6: seq=0 ttl=59 time=74.476 ms

Here is working example of my home OpenWRT box:
config aiccu
        option username         'ABCD-SIXXS'
        option password         '********'
        option protocol         'tic'
        option server           'tic.sixxs.net'
        option interface        'sixxs'
        option tunnel_id        'T123456'
        option requiretls       '0'
        option defaultroute     '1'
        option nat              '1'
        option heartbeat        '1'

RADVd

Final step... Now we want that our OpenWRT box would advertise our subnet prefix on local network. This is done by installing and configuring Radvd daemon. So, we invoke opkg install radvd. Then we enable it: