Originally posted here by Darksnake
A cheapo home router may or may not have a firewall. Cisco on the other hand is not going to be found in a house... (typical house). Now to answer your question if the router has no firewall and is using nat, all its doing is forwarding traffic to the internal network. Scans, hack attempts, etc. Its not a hard concept to understand. You seem to think that a router is supposed to do something that it was not made to do or should have that capability. It just isnt true.
I didnt see a house or home mentioned...
Could be a small office...??
I see many 1700 series Ciscos in small and home offices.
They can and often do have "that" capability!!