Sorry Narayan, I'm new to natting. Could you maybe post a sample config?

I already posted the sample configs.

Let me know what are the subnets behind the firewall/ router and what is the subnet mask of the network 192.168.166.0

Narayan

Here is the interface configs of the router:

_________________

interface FastEthernet0/0

ip address 199.43.3.2 255.255.255.0

speed 100

full-duplex

!

interface Serial0/0

description Circuit

bandwidth 256

ip address 199.43.120.13 255.255.255.252

ip directed-broadcast

encapsulation frame-relay

no ip mroute-cache

no fair-queue

frame-relay map ip 199.43.120.14 51 broadcast payload-compression packet-by-packet

!

interface Ethernet1/0

description Connection

ip address 192.168.166.1 255.255.255.0

full-duplex

!

interface Ethernet1/1

description Connection

ip address 192.168.209.1 255.255.255.0

full-duplex

!

_______________

The firewall connects on fa0/0. There are many networks behind the firewall.

Anything attempting to connect to the host (142.225.118.224, other side of a vendor owned router)needs to show up as 192.168.166.10. There is also another host that has the same type of restriction, but if you can help with the first one I should be able to do the next one by myself.

Thanks.

Do I need to apply the access-list to an interface?

Guess I don't need to apply the access list to an interface, since it seems to be working without it. Thanks for all your help.