Hi
You need to verify the configuration on your router and you will see something like:
ip nat inside source list INTERNAL-NETS interface f0/0 overload
so your ACL is named INTERNAL-NETS. Once you have identified your ACL you just need to add the new subnet into that:
ip access-list standard INTERNAL-NETS
permit 192.168.10.0 0.0.0.255
permit 192.168.20.0 0.0.0.255
Now in order to know if your router has an entry for the new subnet into the routing table you need to do:
router#: show ip route <new subnet>
example:
show ip route 192.168.10.0
Then you will see how the router is knowing this network or if the network is not included.
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