02.02.2011

IPv6: Statless autoconfiguration not working on wireless networks...

If you are running a AVM FritzBox, you can easily enable IPv6 support on this FritzBox (take a look at this posting). But this is only half the way ;-).
I checked the following clients:
  • Ubuntu: autoconfiguration works just out of the box...
  • On windows client you have to enable IPv6 support and after that everything works fine...
  • Debian: there are no router solicitation (ra) messages sent... ;-(
    [and of course no ipv6-connectivity...]
After some checks it was obvious, that the wpa_supplicant-mechanism is the problem. The initialization of wpa needs up to 10s and the ra messages are sent at a time, when the wpa encryption is not set up and the kernel does not resend them.

But there is an easy workaround to resend this messages:
rdisc6 eth1
hades:/etc/network# rdisc6 eth1
Soliciting ff02::2 (ff02::2) on eth1...

Hop limit                 :          255 (      0xff)
Stateful address conf.    :           No
Stateful other conf.      :          Yes
Router preference         :       medium
Router lifetime           :         1800 (0x00000708) seconds
Reachable time            :  unspecified (0x00000000)
Retransmit time           :  unspecified (0x00000000)
 Prefix                   : 2002:5ed5:8422::/64
  Valid time              :         7200 (0x00001c20) seconds
  Pref. time              :         3600 (0x00000e10) seconds
 Recursive DNS server     : fd00::21c:55ff:fe1a:2632
  DNS server lifetime     :         1200 (0x000004b0) seconds
 MTU                      :         1280 bytes (valid)
 Source link-layer address: 00:1C:55:1A:26:32
 from fe80::21c:55ff:fe1a:2632
After that ifconfig shows a auto configured ipv6 address:
inet6-Adresse: 2002:5dd2:84d3:0:210:ff:fe0d:1244/64 Gültigkeitsbereich:Global
and the routes are set like they should:
2002:5dd2:84d3:0:210:ff:fe0d:1244/128 ::                         Un    0    1    351 lo
2002:5dd2:84d3::/64                   ::                         UAe   256  0      4 eth1
::/0                                  fe80::21c:55ff:fe1a:2632   UGDAe 1024 0     42 eth1

...
Just open http://test-ipv6.com:

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