大家好，最近小弟越南公司新建廠，租用了一條外線及6個固定IP (113.161.172.184/29), 拓撲圖如下所示：

很奇怪的是1921的PPPoE連結成功，但WiFi系統都出不了外網。但我在Firewall及WiFi AP的設定都沒有變動下，將cisco 1921換成一台Draytek 2925的router, 利用它的 IP routed subnet功能 (https://www.draytek.com/support/knowledge-base/4796)，WiFi就成功連結外網了

我查了一下Draytek的routing table, 資料如下

發現了一個 IP routed 的interface, 請問這在cisco router下該如何設定呢?

以下是1921的config, 也有勞大家幫我檢查，是否也遺漏或錯誤，感謝

hostname ROUTER1921
!
boot-start-marker
boot-end-marker
!
no logging console
enable password 7 0621390C6C1F5948554542595E
!
no aaa new-model

ip domain name grict168.vn
ip cef
no ipv6 cef
!
multilink bundle-name authenticated
!
vpdn enable
!
vpdn-group pppoe
!
license udi pid CISCO1921/K9 sn FCZ2138B0MJ
!
username admin password 7 143024262C557A7A747A636770
!
redundancy
!
interface Embedded-Service-Engine0/0
no ip address
shutdown
!
interface GigabitEthernet0/0
description "Connect to VNTT GPON"
no ip address
ip virtual-reassembly in
duplex auto
speed auto
pppoe enable group global
pppoe-client dial-pool-number 1
!
interface GigabitEthernet0/1
ip address 113.161.172.190 255.255.255.248
ip virtual-reassembly in
duplex auto
speed auto
!
interface Dialer1
mtu 1492
ip address negotiated
encapsulation ppp
dialer pool 1
ppp authentication pap callin
ppp chap hostname vs2a4273.vi
ppp chap password 7 03530A585257741D1B
ppp pap sent-username vs2a4273.vi password 7 014457570F53535E74
ppp ipcp dns request
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
ip route 0.0.0.0 0.0.0.0 Dialer1
ip ssh version 2
!
control-plane
!
line con 0
password 7 15353D21247B7B757861657041
login
line aux 0
line 2
no activation-character
no exec
transport preferred none
transport output pad telnet rlogin lapb-ta mop udptn v120 ssh
stopbits 1
line vty 0 4
login local
transport input ssh
line vty 5 15
login local
transport input ssh
!
scheduler allocate 20000 1000
!
end