unable to assign ipv6 address to interface to get ipv6 on lan side

I'm unable to assign an ip address within my /64 to allow the services off of Fa0/1 to connect via ipv6 tunnel,
The tunnel is working on the router its self
edge-rtr(config)#int Fa0/1
edge-rtr(config-if)#ipv6 address 2001:470:1F11:F5F::3/64
% 2001:470:1F10:F5F::3/64 can not be configured on FastEthernet0/1, overlapping

edge-rtr(config)#int Fa0/1
edge-rtr(config-if)#ipv6 address 2001:470:1F11:F5F::2/64
% 2001:470:1F10:F5F::2/64 can not be configured on FastEthernet0/1, in use

I do have a routed /48 however i just figured I could use the addressing off of the /64

Routed /64:2001:470:1f11:f5f::/64
Routed /48:2001:470:c26b::/48

any suggestions would be greatly appreciated.

edge-rtr#ping ipv6.google.com
Translating "ipv6.google.com"...domain server (208.180.42.68) [OK]

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2001:4860:4002:800::1010, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 72/72/72 ms

Current configuration : 2794 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
service password-encryption
no service dhcp
!
hostname edge-rtr
!
boot-start-marker
boot-end-marker

!
no aaa new-model
!
!
ip cef
no ip dhcp use vrf connected

ipv6 unicast-routing

interface Loopback2
no ip address
shutdown
!
interface Tunnel0
no ip address
shutdown
!
interface Tunnel100
description Hurricane Electric IPv6
no ip address
no shut
ipv6 address 2001:470:1F11:F5F::2/64
ipv6 enable
tunnel source FastEthernet0/0
tunnel destination 209.51.181.2
tunnel mode ipv6ip
!
!
interface FastEthernet0/0
description Connection to Wan
ip address ****
ip access-group 111 in
no ip redirects
no ip unreachables
no ip proxy-arp
ip accounting output-packets
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
ipv6 enable
no cdp enable
!
interface FastEthernet0/1
description Link to Core
ip address 172.18.22.254 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat inside
ip virtual-reassembly
duplex full
speed auto
ipv6 enable
cdp enable
!

no ip http server
no ip http secure-server

access-list 1 permit 172.18.22.0 0.0.0.255
access-list 23 permit 172.18.22.0 0.0.0.255
ipv6 route ::/0 Tunnel100
control-plane

gatekeeper
shutdown
!
end