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IPv6 in Linux

Building an IPv6 router with GNU/Linux
Gentoo IPv6 Router Guide - good notes on dhcp/dns

IPv4-IPv6 Tunnels

HE IPv6 Tunnel Broker http://tunnelbroker.net/

f /etc/network/interfaces

auto he6to4
iface he6to4 inet6 v4tunnel
  address xxx:yyy:uuu:zzz::2
  netmask 64
  gateway xxx:yyy:uuu:zzz::1
  endpoint 216.66.84.46
  local A.B.C.D      # needed if you have multiple external Interfaces
  ttl 64             # needed because of a tunneling situation

SIXXS Tunnel Broker http://www.sixxs.net

Basic configuration

f /etc/network/interfaces

auto ethX
iface ethX inet6 static
   address xxxx:yyyy:uuuu:::1
   netmask 64

f /etc/sysctl.conf

net.ipv6.conf.default.forwarding=1

f /etc/radvd.conf

interface eth0
{
   AdvSendAdvert on;
   prefix xxxx:yyyy:uuuu:::/64
   {
   };
};