Cisco 841m インターネットへ出るインターフェースを振り分けたい

Cisco841を使って、ルータの勉強をしている者です。

10.145.70.0/24
10.145.80.0/24
上記のネットワークがあり、それぞれVLAN70 VLAN80として切っています。

インターネットには「GigabitEthernet0/5」をONUに直結してDS-lite(Tunnel0)とPPPOE(Dialer1)を設定しています。

行いたいことは
10.145.70.0/24からはTunnel0を10.145.80.0/24からはDialer1を使ってインターネットに出たいのです。

どのような設定を行えばよろしいのでしょうか。

!
! Last configuration change at 11:42:48 JST Sat May 6 2017
! NVRAM config last updated at 11:47:18 JST Sat May 6 2017
!
version 15.5
service timestamps debug datetime msec
service timestamps log datetime msec localtime show-timezone year
no service password-encryption
!
hostname ch-cis01
!
boot-start-marker
boot-end-marker
!
!
logging buffered 4096
enable secret 5 $*****
enable password j*****
!
no aaa new-model
ethernet lmi ce
clock timezone JST 9 0
!
!
!
!
!
ip dhcp excluded-address 10.145.70.1 10.145.70.59
ip dhcp excluded-address 10.145.80.1 10.145.80.9
!
ip dhcp pool In-DHCP
 network 10.145.70.0 255.255.255.0
 default-router 10.145.70.1 
 dns-server 208.67.222.222 208.67.220.220 
!
ip dhcp pool srv-DHCP
 network 10.145.80.0 255.255.255.0
 default-router 10.145.80.1 
 dns-server 208.67.222.222 208.67.220.220 
!
!
!
no ip domain lookup
ip domain name ***local
ip name-server 8.8.8.8
ip inspect name CBAC tcp
ip inspect name CBAC udp
ip inspect name CBAC ftp
ip cef
ipv6 unicast-routing
ipv6 cef
!
parameter-map type inspect global
 log dropped-packets enable
 max-incomplete low 18000
 max-incomplete high 20000
!
license udi pid C841M-4X-JSEC/K9 sn ＊＊＊＊
!
!
!
redundancy
!
!
!
!
!
! 
!
!
!
!
!
!
!
!
!
interface Tunnel0
 description DS-Lite Tunnel
 ip address 192.0.0.2 255.255.255.252
 ip flow ingress
 ip flow egress
 ip nat outside
 ip virtual-reassembly in
 load-interval 30
 tunnel source GigabitEthernet0/5
 tunnel mode ipv6
 tunnel destination 2404:8E01::FEED:100
!
interface GigabitEthernet0/0
 switchport access vlan 70
 no ip address
!
interface GigabitEthernet0/1
 switchport access vlan 80
 no ip address
!
interface GigabitEthernet0/2
 switchport access vlan 80
 no ip address
!
interface GigabitEthernet0/3
 no ip address
 shutdown
!
interface GigabitEthernet0/4
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface GigabitEthernet0/5
 no ip address
 ip nat outside
 ip virtual-reassembly in
 duplex auto
 speed auto
 ipv6 address autoconfig default
 ipv6 enable
 ipv6 dhcp client pd PREFIX
 pppoe enable group global
 pppoe-client dial-pool-number 1
!
interface Vlan1
 no ip address
 shutdown
!
interface Vlan70
 ip address 10.145.70.1 255.255.255.0
 ip flow ingress
 ip flow egress
 ip nat inside
 ip virtual-reassembly in
 ip tcp adjust-mss 1412
 load-interval 30
!
interface Vlan80
 ip address 10.145.80.1 255.255.255.0
 ip nat inside
 ip virtual-reassembly in
!
interface Dialer1
 description INTERLINK GIP ＊＊＊＊＊
 ip address negotiated
 ip mtu 1454
 ip nat outside
 ip virtual-reassembly in
 encapsulation ppp
 dialer pool 1
 dialer-group 1
 ppp authentication chap callin
 ppp chap hostname ****@rb.il24.net
 ppp chap password 0 ****
!
ip forward-protocol nd
no ip http server
no ip http secure-server
!
!
ip nat inside source list 1 interface Tunnel0 overload
ip nat inside source list 2 interface Dialer1 overload
ip route 0.0.0.0 0.0.0.0 Tunnel0
ip route 0.0.0.0 0.0.0.0 Dialer1
!
logging trap debugging
logging origin-id string ch-cis01
logging facility local5
logging host ****41.136
dialer-list 1 protocol ip permit
!
!
access-list 1 permit 10.145.70.0 0.0.0.255
access-list 2 permit 10.145.80.0 0.0.0.255
!
!
line con 0
 logging synchronous
 no modem enable
line vty 0 4
 password ****
 login
 transport input none
!
scheduler allocate 20000 1000
ntp server ntp.nict.jp
!
end