NAT Problem in a global Network

Hello,

first of all a overview of our Network and behind the "drawing" is my question.

(a) 172.29.128.0 Mask 255.255.255.0 (b) 10.128.99.0 Mask 255.255.255.248 (c) 10.128.200.0 Mask 255.255.255.248 (d) 172.29.132.0 Mask 255.255.255.128

GW= Gateway FW= Firewall NR= NAT-Router IR= ISDN dial out Router

GW Inside IP = 172.29.128.252 GW Outside IP = 10.128.99.1

FW Inside IP = 10.128.99.2 FW NAT IP = 10.128.200.1

NR inside IP = 10.128.200.6 NR outside IP = 172.29.132.30

IR inside IP = 172.29.132.2 IR outside IP = dynamic (customer dial up)

____Interfaces 3-6 (not interesting at this moment)

| | | |

-(a)--|GW|--(b)--|FW|--(c)--|NR|--(d)--|IR|----

Question:

If I want to hide all dial up customers behind a internal 10.128.0.0/24 Network what are the steps i have to follow.

Let's try it with a customer IP 192.168.1.6.

Where(which device) do I have to make the NAT-translation from

I'm really looking forward to get a feedback soon. Thank you all in advance for the support.

BR Heiko