DHCPv6/auto setup for Windows Vista/7

[Andreas Meile]

Hello Rick

----- Original Message ----- 
From: "Rick Dicaire" <kritek at gmail.com>
To: "Users of ISC DHCP" <dhcp-users at lists.isc.org>
Sent: Saturday, August 06, 2011 4:36 PM
Subject: Re: DHCPv6/auto setup for Windows Vista/7


> Take a look at
>
> http://linux.ardynet.com/ipv6setup.php
>
> This details RA/DHCPv6/dynamic dns configurations, hope this helps

Thanks for your article. Meanwhile after several attempts I got a working 
IPv6 configuration based on the RFC 4862[1] flags, i.e. the key point is the 
right cooperation between dhcpd (running as stateless DHCP server) and radvd 
(must advert AdvOtherConfigFlag to control the client to get the missing 
things like DNS servers).

For my test, I used the following files:

/etc/radvd.conf:

interface eth0
{
   AdvSendAdvert on;
   AdvManagedFlag off;
   AdvOtherConfigFlag on;
   prefix 2001:db8:8:e000::/64
   {
       AdvOnLink on;
       AdvAutonomous on;
   };
   route ::/0
   {
   };
};

/etc/dhcp/dhcpd.conf:

# DHCPv6 server: distribute DNS servers and domain suffix list only

authoritative;
option dhcp6.name-servers 2001:db8:8:e000:202:b3ff:fe62:fda6;
option dhcp6.domain-search "example.net";

# Set this to `interim' when doing ddns updates
ddns-update-style none;
update-static-leases off;

shared-network LAN {
        subnet6 2001:db8:8:e000::/64 {
             # No range6 needed because stateless!
        }
}

After

/etc/init.d/radvd start
dhcpd -6 eth0

you get the following result in Windows 7 (I only have a German installation 
DVD from Microsoft but I hope the numbers are self-speaking) when the IPv4 
protocol is disabled in the network settings:

=========== Beginn CMD.EXE session =================
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. Alle Rechte vorbehalten.

C:\Users\admklein>ipconfig /all

Windows-IP-Konfiguration

   Hostname  . . . . . . . . . . . . : mavtest
   Primäres DNS-Suffix . . . . . . . :
   Knotentyp . . . . . . . . . . . . : Hybrid
   IP-Routing aktiviert  . . . . . . : Nein
   WINS-Proxy aktiviert  . . . . . . : Nein
   DNS-Suffixsuchliste . . . . . . . : example.com
                                       example.local

Ethernet-Adapter LAN-Verbindung:

   Verbindungsspezifisches DNS-Suffix: example.net
   Beschreibung. . . . . . . . . . . : Intel(R) PRO/1000 
MT-Desktopverbindung
   Physikalische Adresse . . . . . . : 00-11-25-0C-E9-2C
   DHCP aktiviert. . . . . . . . . . : Ja
   Autokonfiguration aktiviert . . . : Ja
   IPv6-Adresse. . . . . . . . . . . : 
2001:db8:8:e000:b004:8d2f:ed91:c817(Bevorzugt)
   Temporäre IPv6-Adresse. . . . . . : 
2001:db8:8:e000:bdde:27bf:4af9:681a(Bevorzugt)
   Verbindungslokale IPv6-Adresse  . : 
fe80::b004:8d2f:ed91:c817%10(Bevorzugt)
   Standardgateway . . . . . . . . . : fe80::20d:60ff:fe49:9cc0%10
   DHCPv6-IAID . . . . . . . . . . . : 234884448
   DHCPv6-Client-DUID. . . . . . . . : 
00-01-00-01-14-7E-8E-22-00-0D-60-AC-1E-0E

   DNS-Server  . . . . . . . . . . . : 2001:db8:8:e000:202:b3ff:fe62:fda6
   NetBIOS über TCP/IP . . . . . . . : Deaktiviert
   Suchliste für verbindungsspezifische DNS-Suffixe:
                                       example.net

Tunneladapter Teredo Tunneling Pseudo-Interface:

   Medienstatus. . . . . . . . . . . : Medium getrennt
   Verbindungsspezifisches DNS-Suffix:
   Beschreibung. . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physikalische Adresse . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP aktiviert. . . . . . . . . . : Nein
   Autokonfiguration aktiviert . . . : Ja

C:\Users\admklein>ping -6 www.sunny.ch

Ping wird ausgeführt für mynx.iway.ch [2001:8e0:41:604::90] mit 32 Bytes 
Daten:
Antwort von 2001:8e0:41:604::90: Zeit=19ms
Antwort von 2001:8e0:41:604::90: Zeit=21ms
Antwort von 2001:8e0:41:604::90: Zeit=25ms
Antwort von 2001:8e0:41:604::90: Zeit=19ms

Ping-Statistik für 2001:8e0:41:604::90:
    Pakete: Gesendet = 4, Empfangen = 4, Verloren = 0
    (0% Verlust),
Ca. Zeitangaben in Millisek.:
    Minimum = 19ms, Maximum = 25ms, Mittelwert = 21ms

C:\Users\admklein>_
============== End CMD.EXE ============================

Important note: Windows 7 shows an exlamation mark first (limited 
connectity) but as soon as your visit the first IPv6 connected web site like 
www.sunny.ch in the Internet Explorer then Microsoft's network connection 
manager is happy immediately. :-)

In /var/log/daemon.log you get the following entries when everything works:

Aug 17 11:26:34 ipv6gate dhcpd: Information-request message from 
fe80::b004:8d2f:ed91:c817 port 546, transaction ID 0x5E09CE00
Aug 17 11:26:34 ipv6gate dhcpd: Sending Reply to fe80::b004:8d2f:ed91:c817 
port 546

i.e. Windows 7 has requested the missing configuration informations only.

I recommend to add a FAQ article to your home 
http://linux.ardynet.com/ipv6setup.php as follow:

======= Beginn FAQ article =========
Q: I want setup a Linux router for my Windows Vista/7 clients with a fully 
working IPv6 auto-configuration infrastructure for my static 6in4 tunnel.

A: Because Microsoft does not support the RFC 6106 style RDNSS option yet 
you need both the radvd and dhcpd daemon together and setup a RFC 4862 style 
auto config infrastructure. Use the following /etc/radvd.conf and 
/etc/dhcp/dhcpd.conf:

(Post my examples above)
======= End FAQ article =========

            Andreas

[1] http://www.ietf.org/rfc/rfc4862.txt