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As per the NAT-PMP Spec, the port forwarding server should notify all connected 
clients if the NAT 
router's IP changes.

1. Client Launches
2. Server launches.
3. Server informs client that NAT PMP is necessary.
4. Client Registers Port Mappings.
... stuff missing here...
5. Router IP address changes.
6. Server notifies all clients.
7. Server attempts to reclaim ports and follows normal proceedures after 
issuing the requests.

The Port Forwarding Server should re requests ports automatically, preferably 
half way to their 
expiry in DHCP fashion. The specs have more information about how retry should 
work if that 
packet fails to make it to the router or the server fails to receive a response.

Client must be informed when using NAT-PMP is not necessary. Specificially this 
means two things, 
according to the spec:

1. NAT PMP must not be used when the computer that the application linked 
against OpenPort Kit is 
on has a public IP address.

2. NAT PMP must not be used when a request to the router times out. This can 
time out by retrying 
until the maximum period (64 seconds) is exceeded or the router sends an ICMP 
port unreachable 
response.

Port Forward Server should log all of its activities to the system log, either 
using syslog or Apple's 
logging facilities.