PROS vs. CONS
NAT advantages:
 | Use of a single registered IP address for an entire network |
| Lowers ISP support burden |
| Transparent to end systems in some cases |
| Delays need for IPv4 replacement |
| Mask the true internal IP addresses of the internal network |
NAT disadvantages:
| Breaks end-to-end model |
| Enables end-to-end address conflicts |
| Increases local support burden and complexity |
| Certain applications do not work properly in conjunction |
| Increases the probability of mis-addressing |