Hurricane Electric’s IPv6-enabled DNS server

Solution #1: Add a prefix policy to prefer IPv4 addresses over IPv6

Prefix policy table is similar a routing table, it determines which IP addresses are preferred when making a connection. Note that higher precedence in prefix policies is represented by a higher "precedence" value, exactly opposite to routing table "cost" value.

Default Windows prefix policy table:

C:\> netsh interface ipv6 show prefixpolicies
Querying active state...

Precedence  Label  Prefix
----------  -----  --------------------------------
        50      0  ::1/128
        40      1  ::/0
        30      2  2002::/16
        20      3  ::/96
        10      4  ::ffff:0:0/96
         5      5  2001::/32

Note that IPv6 addresses (::/0) are preferred over IPv4 addresses (::/96, ::ffff:0:0/96).

We can create a policy that will make Hurricane Electric IPv6 tunnel less favorable than any IPv4 address:

netsh interface ipv6 add prefixpolicy 2001:470::/32 3 6

2001:470::/32 is Hurricane Electric's prefix, 3 is a Precedence (very low) and 6 is a Label.

I could have used a more generic prefix, but I wanted to make sure that if and when I get direct IPv6 connectivity from an ISP, it will take precedence over IPv4.

If you adapt this solution, you need to substitute an appropriate IPv6 prefix instead of my Hurricane Electric one.

Solution #2: Tweak registry to make Windows always prefer IPv4 over IPv6

This solution is more generic, but more invasive and less standards-compliant. In the end, Windows will still modify the prefix policy table for you.

• Open RegEdit, navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tcpip6\Parameters
• Create DisabledComponents DWORD registry value, set its value to 20 (Hexadecimal). See Microsoft KB 929852 for more info about this registry key, especially if DisabledComponents already exists on your system.
• Reboot.

So it turns out there were several issues with my setup. Let's document everything!

Client OS

Mac OS X does not particularly like IPv6 over PPP. Use the following after the connection has been set up:

sudo ipconfig set ppp0 AUTOMATIC-V6
sudo route add -inet6 default -interface ppp0

The prior seems to make OS X adhere to router advertisements; the latter adds a default route for IPv6. (Now, if only the certain-fruity-mobile-operating-system version of route provided -inet6, I'd be a happy wooden boy.)

Also take note that OS X will ignore whatever address was supposed to be negotiated over IPv6 and set up only a local address. This may interfere with routing towards OS X.

On the other hand, Windows 8 (of all systems!) has happily picked up the address sent over PPP, took note of the router advertisement, and overall configured itself flawlessly. PPTP really works nice in Windows.

Server

First thing I missed was that Hurricane Electric's tunnel broker actually assigns TWO /64 prefixes; one is supposed to be solely for client use, while the other is intended for routing additional clients (such as the PPTP client). And if you need more addresses (or prefixes!), you can even get a /48 prefix. (With IPv6, this means there's more bits for 'your' use; HE's prefix takes 'only' 48 bits. So that provides you a few more bits to control before the auto-generated suffix, created from a MAC address or even created randomly, kicks in and takes over last 64 bits. You could theoretically wiggle and subnet even with only 64-bits to spare, but I've seen strange behavior on either Windows 8 or OS X, so I wouldn't rely too much on that.)

Instead of configuring radvd directly and running it as a server -- simply don't configure it globally. That is, don't run it as a service on Debian.

Instead, let's follow Konrad Rosenbaum's example, at Silmor.de, and have radvd configured after pppd creates the PPP interface.

1. Set up your IPv6 connectivity. I use Hurricane Electric; I've configured it as follows:

   # hurricane electric tunnel
   # based on: http://www.tunnelbroker.net/forums/index.php?topic=1642.0
   auto he-ipv6
   iface he-ipv6 inet6 v4tunnel
       address 2001:470:UUUU:VVVV::2
       netmask 64
       endpoint  216.66.86.114
       ttl 255
       gateway 2001:470:UUUU:VVVV::1
       ## from http://lightyearsoftware.com/2011/02/configure-debian-as-an-ipv6-router/
       # I did not set up the routing of the /64 nor the /48 prefix here, but
       # this would ordinarily do it.  
       #up ip link set mtu 1280 dev he-ipv6
       #up route -6 add 2001:470:WWWW:VVVV::/64 he-ipv6
   
       # Note that Hurricane Electric provides different /64 IPv6 prefixes
       # for the client (UUUU:VVVV) and routing (WWWW:VVVV). 
       # And the /48 prefix is very different altogether.
   

2. Install pptpd. (Of course, take note of PPTP's insecurity as a protocol, and consider using OpenVPN or some other alternative.)

3. Edit /etc/ppp/pptpd-options

   name pptpd
   refuse-pap
   refuse-chap
   refuse-mschap
   require-mschap-v2
   require-mppe-128
   proxyarp
   nodefaultroute
   lock
   nobsdcomp
   ipv6 ::1,::2
   

   Note the last line is different from the text in my question. You're assigning some static addresses which may be respected by your client OS or not. (OS X seems to ignore them, but Windows uses them.)

4. Create users for PPTP. Second column filters based on name argument in pptpd-options. Edit /etc/ppp/chap-secrets:

   ivucica pptpd AHyperSecretPasswordInPlainText 10.0.101.2 10.0.101.3 10.0.101.4
   

   You're supposed to be able to replace the addresses with * instead of listing them manually. I did not try that out.

5. Assign your PPTP users some IPv6 prefixes. NOTE: this is solely used by the script I'll list below, which is derived from Konrad's script.

   Edit /etc/ppp/ipv6-addr:

   ivucica:1234
   littlejohnny:1235
   

6. Add new file /etc/ppp/ipv6-up.d/setupradvd:

   #!/bin/bash
   ADDR=$(grep ^$PEERNAME: /etc/ppp/ipv6-addr |cut -f 2 -d :)
   if test x$ADDR == x ; then
    echo "No IPv6 address found for user $PEERNAME"
    exit 0
   fi
   
   # We'll assign the user a /64 prefix.
   # I'm using a Hurricane Electric-assigned /48 prefix.
   
   # Operating systems seem to expect to be able to assign the 
   # last 64 bits of the address (based on ethernet MAC address
   # or some other identifier). So try to obtain a /48 prefix.
   
   # If you only have a /64 bit prefix, you can try to assign a
   # /80 prefix to your remote users. It works, but I'm only now
   # trying to enable these users to have routing.
   
   USERPREFIX=2001:470:XXXX:$ADDR
   USERPREFIXSIZE=64
   USERPREFIXOURADDRESS=1
   USERPREFIXUSERADDRESS=2
   
   # Add the address for your side of the tunnel to the PPP device.
   ifconfig $IFNAME add $USERPREFIX::$USERPREFIXOURADDRESS/$USERPREFIXSIZE
   
   # establish new route
   # (when a packet is directed toward user subnet, send it to user ip)
   route -6 add $USERPREFIX::/$USERPREFIXSIZE gw $USERPREFIX::$USERPREFIXUSERADDRESS
   
   #generate radvd config
   RAP=/etc/ppp/ipv6-radvd/$IFNAME
   RA=$RAP.conf
   echo interface $IFNAME >$RA
   echo '{ AdvSendAdvert on; MinRtrAdvInterval 5; MaxRtrAdvInterval 100;' >>$RA
   echo ' prefix' $USERPREFIX::/$USERPREFIXSIZE '{};' >>$RA
   
   # Instead of your DNS...
   #echo ' RDNSS $USERPREFIX::$USERPREFIXOURADDRESS {}; };' >>$RA
   # ...try assigning the Google DNS :)
   echo ' RDNSS 2001:4860:4860::8888 {}; }; ' >> $RA
   
   # The creation of radvd configuration could be more readable, but whatever.
   
   # Start radvd
   /usr/sbin/radvd -C $RA -p $RAP.pid
   
   exit 0
   

   Don't forget to chmod the script to make it executable by pppd:

   chmod 755 /etc/ppp/ipv6-up.d/setupradvd
   

7. The script spews radvd configuration into /etc/ppp/ipv6-radvd/… ensure that the folder exists!

   mkdir /etc/ppp/ipv6-radvd
   

8. Also add /etc/ppp/ipv6-down.d/setupradvd (and make it executable!) -- taken verbatim from Konrad:

   #!/bin/bash
   RAP=/etc/ppp/ipv6-radvd/$IFNAME
   kill `cat $RAP.pid` || true
   rm -f $RAP.*
   

   And

   chmod 755 /etc/ppp/ipv6-down.d/setupradvd
   

I have not tested using DHCPv6 to distribute the routing information, addresses or DNS information, especially since rtadv should be fulfilling these roles. It also would not help me, because as of Mountain Lion, OS X still does not ship with a DHCPv6 client (perhaps intentionally; nine out of ten dentists most of IPv6 experts agree that DHCP is evil).

Once again, please note Michael's comments on PPTP security; consider using OpenVPN in production.

Yes, Konrad Rosenbaum also has a nice tutorial on IPv6 over OpenVPN. :-)