IPv6 wireless stumbler

[Deepti Dhokte]

AP is a L2 device, so the upstream IPv6 L-3switch/router to which AP
connects to, If configured to do prefix advertisements, and your client
if properly configured to use IPv6 stack, client can auto-configure
global unicast IPv6 addresses.

Technically your client might have already configured
fe80:: based link-local address, for all the active interfaces when you
install IPv6 stack, if the site allows link local addresses
to be used to access IPv6 internet, you are all set.
But that is not a normal scenario.

In short: 
associate to an AP, and find out if the ipv4 (if DHCP is enabled on that
interface) and global Unicast IPv6 addresses (if stack is already in
place) are getting configured on your client. If yes, try to visit
www.kame.net if you see moving turtle You are connected on IPv6 :-)

Hopefully you are dealing with fewer AP's around.

Another try would be:
Check packet dumps. When you associate to an AP and the packet trace
displays IPv6 prefix advertisements, that AP is probably associated to
IPv6 network as well. Check, if your client might have configured the
address with given prefix; (since you are able to see these prefix
advertisements in the packet dumps, started on the wireless card that is
associating with different APs, it is likely that client if has IPv6
stack could have already auto-configured IPv6 address.).

(Prefix advertisements are ICMP6 type Neighbor solicitation messages on
top of IPv6 protocol. Packet sniffers such as Ethereal can parse these
messages and provide useful Differentiation at very detail level)

I hope it helps. If anyone knows better methods, I am eager to know. 

-Deepti

-----Original Message-----
From: owner-freebsd-net at freebsd.org
[mailto:owner-freebsd-net at freebsd.org] On Behalf Of User Ernie
Sent: Monday, August 09, 2004 8:31 PM
To: freebsd-net at freebsd.org
Subject: IPv6 wireless stumbler

I am trying to find out if there are any IPv6 community access wireless
nodes in my area the I can become a client for. There are dozens of AP's
that come up with a scan using kismet but I don't know how to tell if 
they are issuing IPv6 addresses. Can anyone suggest a method?

- Ernie.
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