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How to set up NAT with overload on a serial connected network?

My network looks like this: http://imgur.com/yr3VUvl. I have tried the normal way of configuring nat, that is to set the ip nat outside on the serial towards ISP and ip nat inside on the serial towards R2. I have also permitted both the serial network and LAN network connected to R2. I have also added a default route towards the ISP and a static route from the ISP towards the HQ. But I am still unable to ping the ISP from the host. 

2 REPLIES 2
Reza Sharifi
Hall of Fame Expert

2901 (r2) needs a default route towards 2901 (HQ) and 2901 (HQ) needs a default route towards the ISP. Also 2901 (HQ) needs a static route for PC and server subnet pointing to 2901 (r2).

HTH

Julio E. Moisa
VIP Mentor

Hi

You should have something like that on your 2901 HQ router

interface serial0/0
description TO-ISP

ip address 10.0.0.3 255.255.255.0

ip nat outside

interface serial 0/1
description TO-R2

ip address 192.168.1.1 255.255.255.0

ip nat inside

ip nat inside source list PRIVATE-NETS interface Serial 0/0 overload

ip route 0.0.0.0 0.0.0.0 10.0.0.1  name INTERNET

ip route <internal networks> <subnet mask> <IP of R2's next hop>

ip access-list standard PRIVATE-NETS

permit any

*To test you could create just a loopback on ISP router and nothing else, example:

interface lo 100
ip add 8.8.8.8 255.255.255.255

* Remember to use routing betwen HQ and R2 in order to advertise a default route and know how to reach the internal networks. 

Hope it is useful

:-)




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