$SERVERIPV4ADDR == Server IPv4 address as listed on tunnelbroker.net
$CLIENTIPV4ADDR == Client IPv4 address as listed on tunnelbroker.net
$CLIENTIPV6ADDR == Client IPv6 address as listed on tunnelbroker.net
$ROUTED64 == Routed /64 as listed on tunnelbroker.net
# IPv6 via HE tunnel...
auto he-ipv6
iface he-ipv6 inet6 v4tunnel
address $CLIENTIPV6ADDR
netmask 64
remote $SERVERIPV4ADDR
local $CLIENTIPV4ADDR
endpoint any
ttl 64
up ip -6 route add 2000::/3 via ::$SERVERIPV4ADDR dev he-ipv6
up ip -6 addr add $ROUTED64::1:1/128 dev he-ipv6
up ip -6 addr add $ROUTED64::2:1/128 dev he-ipv6
down ip -6 route flush dev he-ipv6