IPv6, XS4ALL and FreeBSD

• Visit XS4ALL's Self Service Centrum (click "IPv6 Tunnel", unfortunately no direct link) to have an IPv6 tunnel configured on their side.
  Enter your IPv4 address and enable the tunnel.
• On your FreeBSD machine (running a recent 4.4 or 5.0-CURRENT), add the following to /etc/rc.conf:

  ipv6_enable="YES"
  ipv6_defaultrouter="[XS4ALL's tunnel endpoint]"
  ipv6_gateway_enable="YES"
  ipv6_network_interfaces="de0 gif0"
  ipv6_ifconfig_de0="[your IPv6 prefix]::1 prefixlen 64"
  ipv6_ifconfig_gif0="[your IPv6 tunnel endpoint] prefixlen 127"
  rtadvd_enable="YES"
  
  gif_interfaces="gif0"
  gifconfig_gif0="[your IPv4 address] [XS4ALL's endpoint IPv4 address]"
  

• Edit /etc/rtadvd.conf:

  de0:\
  	:addrs#1:addr="[your prefix]":prefixlen#64:
  

  (Note: the examples above assume that your network card is named de0. Substitute the appropriate name for yours. The prefix length has to be 64.)
• On other machines on your LAN, you then only need to add the following line to /etc/rc.conf:

  ipv6_enable="YES"
  

• To debug router advertisements you can use radvdump from the net/radvd port.
• Now you're ready to try to use some network diagnostics tools such as ping6, traceroute6 and telnet -6. You can run tcpdump -p -n -e -i gif0 to see what packets are being sent out. Try doing a # make search key=ipv6 in /usr/ports to see what's available.
• If you want to serve DNS on IPv6 sockets as well you will have to install BIND9. I used the following to run BIND8 and BIND9 concurrently on the same machine:

  ./configure --with-libtool --enable-shared --disable-static \
   --prefix=/usr/local --sysconfdir=/usr/local/etc/namedb --with-openssl\
   --localstatedir=/var
  

  And in named.conf (running only primary for some domains that are shared with BIND8):

  options {
          directory "/etc/namedb";
          pid-file "/var/run/named/bind9";
          transfer-format many-answers;
          recursion no;
          notify yes;
          listen-on { none; };
          listen-on-v6 { any; };
  };