Zyxel P-791R v2 Рекомендации по настройке онлайн [16/98] 154425

P-791R v2 Support Notes

like a router. In this case, we use the router mode which works as a general

Router plus a DSL Modem.

15. How do I know I am using PPPoE?

PPPoE requires a user account to login to the provider's server. If you need to

configure a user name and password on your computer to connect to the ISP

you are probably using PPPoE. If you are simply connected to the Internet

when you turn on your computer, you probably are not. You can also check

your ISP or the information sheet given by the ISP. Please choose PPPoE as

the encapsulation type in the P-791R v2 if the ISP uses PPPoE.

16. Why does my provider use PPPoE?

PPPoE emulates a familiar Dial-Up connection. It allows your ISP to provide

services using their existing network configuration over the broadband

connections. Besides, PPPoE supports a broad range of existing applications

and service including authentication, accounting, secure access and

configuration management.

17. What is DDNS?

The Dynamic DNS service allows you to alias a dynamic IP address to a static

hostname, allowing your computer to be more easily accessed from various

locations on the Internet. To use the service, you must first apply an account

from several free Web servers such as http://www.dyndns.org/.

Without DDNS, we always tell the users to use the WAN IP of the P-791R v2 to

reach our internal server. It is inconvenient for the users if this IP is dynamic.

With DDNS supported by the P-791R v2, you apply a DNS name (e.g.,

www.zyxel.com.tw) for your server (e.g., Web server) from a DDNS server.

The outside users can always access the web server using the

www.zyxel.com.tw regardless of the WAN IP of the P-791R v2.

When the ISP assigns the P-791R v2a new IP, the P-791R v2 updates this IP

to DDNS server so that the server can update its IP-to-DNS entry. Once the

IP-to-DNS table in the DDNS server is updated, the DNS name for your web

server (i.e., www.zyxel.com.tw) is still usable.

18. When do I need DDNS service?

When you want your internal server to be accessed by using DNS name rather

than using the dynamic IP address we can use the DDNS service. The DDNS

server allows to alias a dynamic IP address to a static hostname. Whenever