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IPv6

ff::/8 multicast ff0x is reserverd
ff01::1 multicast all nodes interface local
ff02::1 multicast all nodes link local ping ff02::1%tun2
ff01::2 multicast all routers interface local
ff02::2 multicast all routers link local
ff03::2 multicast all routers site local
fe80::/10 link local address
fc00::/7 Unique Local Address (ULA) fc00::/7 and fd00::/7
2000:: Global address first
3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff Global address last
/etc/network/interfaces
iface eth0 inet dhcp
iface eth0 inet6 static
  address 2001::2
  netmask 64
  up -ip -6 route add ::/0 via 2001::1 dev eth0 
  down ip -6 route del ::/0 via 2001::1 dev eth0

Autoconfig and RA

http://strugglers.net/~andy/blog/2011/09/04/linux-ipv6-router-advertisements-and-forwarding/

Auto configuration can be disabled temporary for eth1 with: 

sudo sysctl -w net.ipv6.conf.eth1.autoconf=0
sudo sysctl -w net.ipv6.conf.eth1.accept_ra=0

or for all interfaces with: 

sudo sysctl -w net.ipv6.conf.all.autoconf=0
sudo sysctl -w net.ipv6.conf.all.accept_ra=0

Reenabling works by using 1 instead of 0 in the call.

RADVD

Router ADVertisement Daemon. This daemon listens to router solicitations (RS)
and answers with router advertisement (RA). Furthermore unsolicited RAs are also sent from time to time.
This protocol is meant for host auto-configuration and not for route propagation between routers.