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

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May 13th, 2017
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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. 

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Reza Sharifi Sat, 05/13/2017 - 19:24
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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 Moisa Sun, 05/14/2017 - 19:02
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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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