I am configuring a 1721 router for Internet access for a branch office with 30 employees. There will be a ASA5505 firewall behind the 1721. The ISP has provided 14 public Ethernet IP addresses. Is it more efficient to perform PAT or NAT? Is it more efficient to perform PAT or NAT on the 1721 router or ASA5505 firewall?
We also have a MPLS network connected to the LAN switch on the above network.