Nat-overload issues with pppoe lab in gns3

[Mr.Tich]

Hi guys,

I've the topology as below,

After authentication CHAP on the client site, the PC on LAN can't ping to GoogleDNS: 4.4.2.2

I dont know the reason until now, any suggestions? Thanks !!

--------------------PPPOE SERVER

ISP-VNPT(config)#int virtual-template 1

ISP-VNPT(config-if)#ip add 113.161.165.121 255.255.255.248

ISP-VNPT(config)#ip local pool DHCP 113.161.165.122 113.161.165.126

ISP-VNPT(config)#int virtual-template 1

ISP-VNPT(config-if)#peer default ip add pool DHCP

ISP-VNPT(config)#bba-group pppoe VNPT

ISP-VNPT(config-bba-group)#virtual-template 1

ISP-VNPT(config)#int f0/0

ISP-VNPT(config-if)#no ip add

ISP-VNPT(config-if)#pppoe enable group VNPT

ISP-VNPT(config-if)#no shut

ISP-VNPT(config)#user dongthai pass cisco@123456

ISP-VNPT(config)#interface virtual-template 1

ISP-VNPT(config-if)#ppp authentication chap callin

ISP-VNPT(config)#int loopback 1

ISP-VNPT(config-if)#ip add 4.4.2.2 255.255.255.0

ISP-VNPT(config-if)#no shut

-------------------------------PPPOE CLIENT

Dongthai7200(config)#int dialer 1

Dongthai7200(config-if)#dialer pool 1

Dongthai7200(config-if)#encapsulation ppp

Dongthai7200(config-if)#ip add negotiated

Dongthai7200(config-if)#mtu 1492

Dongthai7200(config-if)#ppp chap hostname dongthai

Dongthai7200(config-if)#ppp chap pass cisco@123456

Dongthai7200(config)#int f1/0

Dongthai7200(config-if)#no ip add

Dongthai7200(config-if)#pppoe enable

Dongthai7200(config-if)#pppoe-client dial-pool-number 1

Dongthai7200(config-if)#no shut

Dongthai7200(config)#service dhcp

Dongthai7200(config)#ip dhcp pool DHCP-LAN

Dongthai7200(dhcp-config)#network 10.10.10.0 255.255.255.0
Dongthai7200(dhcp-config)#default-router 10.10.10.1

Dongthai7200(dhcp-config)#lease 0 2

Dongthai7200(dhcp-config)#int f0/0

Dongthai7200(config-if)#ip add 10.10.10.1 255.255.255.0

Dongthai7200(config-if)#no shut

Dongthai7200(config-if)#int f0/0

Dongthai7200(config-if)#ip nat inside

Dongthai7200(config-if)#int dialer 1

Dongthai7200(config-if)#ip nat outside

Dongthai7200(config)#access-list 1 permit any

Dongthai7200(config)#ip nat inside source list 1 int dialer 1 overload

Dongthai7200(config)# route 0.0.0.0 0.0.0.0 dialer 1

[paul driver]

Hello

i am assuming you do have connection between ppoe server and client meaning the client receives a ppoe dhcp allocation?

if so try the following:

int fa1/0

ip nat outside 

exit

interface Dialer1
ip tcp adjust-mss 1452

no access-list 1

access-list 1 permit 10.10.10.0 0.0.0.255

[Mr.Tich]

Hi sir,

Yep, of course I already get the IP address for interface dialer1 from ISP.

 Many thanks to you for supporting. But unfortunately, result is the same with previous problem, PC on Lan still get the message "timeout" when executing ping command.

[paul driver]

Hello

can you confirm if you can ping that ip address from the rrtr 

and you clients also receive an ip address and have the correct default gateway 

sh pppoe sessions

[Mr.Tich]

Hi Paul,

Surely, I configured the default-gateway correctly for PCS on LAN.

Still not working, much effort to fix this lab.
it's a little bit complex to simulate PPPOE server on GNS3 software. I tried to figure out the problem why PCs on LAN couldn't reach the destination loopback1 on PPPOE-server.
Although I used "ip unnumbered loopback 1" command to get ip for "int virtual-template 1", it always shows "timeout message". when i run a new ping test.