IPv6

• Basic info for figuring out ISP prefix + IPv4 address ($V6PREFIX)

printf "2602:%02x:%02x%02x:%02x00::1\n" $(echo YOUROUTSIDEIPADDRESSHERE | tr . ' ')

Cisco IOS 6rd Centurylink

interface Tunnel1
 description Qwest_IPv6
 no ip address
 no ip redirects
 ipv6 address $V6PREFIX:XX00::1/64
 tunnel source Dialer0
 tunnel mode ipv6ip 6rd
 tunnel 6rd prefix 2602::/24
 tunnel 6rd br 205.171.2.64
!
ipv6 route ::/0 Tunnel1 2602:CD:AB02:4000::
!
interface GigabitEthernet0/1
 description LAN
 ipv6 address $V6PREFIX:XX01::1/64
 ipv6 enable
 ipv6 mtu 1452

TomatoUSB 6rd Centurylink

This configuration allows for stateful(static) and DHCPv6
Basic->IPv6

Service Type: Other
Wan Interface: tun6rd
Static DNS: 2001:428::1
            2001:428::2
Enable RA: (leave unchecked)
Accept RA: (leave unchecked)

Administration->Scripts->Init

insmod tunnel4
insmod sit

Administration->Scripts->WAN Up

WANIP=$(nvram get wan_ipaddr)
if [ -n "$WANIP" ]; then
    ip tunnel del tun6rd
    V6PREFIX=$(printf '2602:%02x:%02x%02x:%02x00' $(echo $WANIP | tr . ' '))
    ip tunnel add tun6rd mode sit local $WANIP ttl 64
    ip addr add ${V6PREFIX}::1/24 dev tun6rd
    ip addr add ${V6PREFIX}::1/64 dev br0
    ip link set tun6rd up
    ip -6 route add ::/0 via ::205.171.2.64 dev tun6rd
fi

Advanced->DHCP/DNS

Custom config:
dhcp-range=V6PREFIX:XX01::9, V6PREFIX:XX01::ffff, ra-names, 24h
enable-ra
dhcp-option=option6:dns-server,V6PREFIX:XX01::1