10
Chapter 5-5.
Advance Network Port Forwarding Technology
Port forwarding technology is an advanced network technology which is wildly used for using
one global IP shared by many network devices. The network architecture is illustrated as below.
Port 80 of the router (61.220.86.166) is assigned to the device IP address, 192.168.0.10. Port
81 of the router is assigned to the device IP address, 192.168.0.11. When Remote PC accesses
the router's port 81 (61.220.86.166:81), it eventually accesses the video server at 192.168.0.11.
Http://61.220.86.166:81
IP : 192.168.0.11
IP : 192.168.0.10
Internet
Router's global IP : 61.220.86.166
Port 80
192.168.0.10
Port 81
192.168.0.11
Chapter 5-6.
Advance Network DDNS and PPPoE Technologies
The advantage of using DDNS and PPPoE is to save the expense of IP address.
PIH-036/038IP's PPPoE service gets a dynamic global IP address after system reboot. This IP
address may get changed periodically. This is the address needed to access the video server
over Internet.
When ISP re-assigns a new IP address to PIH-036/038IP, PIH-036/038IP notifies DDNS service.
A remote PC can access PIH-036/038IP by typing domain name in a browser. The domain name
gets resolved by DDNS service and gets translated to its dynamic global IP address. The
dynamic global IP address can now be accessed by the remote PC.
Remote PC
Internet
1. Get IP address from ISP after reboot.
3. Notify DDNS server for the new IP address if
PIH-036/038IP gets reboot or assigned a new IP
address.
DDNS Server
ISP
2. ISP assigns global IP
to PIH-036/038IP
4. Access PIH-036/038IP
using the dynamic global.
5. Resolve domain name to IP address
and sent back to remote PC.