When Do I Need Ddns Service; What Is Ddns Wildcard? Does The P-661Hw-D Support Ddns Wildcard; Can The P-661Hw-D's Sua Handle Ipsec Packets Sent By The Ipsec Gateway; How Do I Setup My P-661Hw-D For Routing Ipsec Packets Over Sua - ZyXEL Communications P-661HW-D Series Support Note

P-661HW-D Series Support Notes
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-661HW-D.
When the ISP assigns the P-661HW-D a new IP, the P-661HW-D 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.

10. 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
the ISP assigns you a new IP, the P-661HW-D sends this IP to the DDNS
server for its updates.
11. What is DDNS wildcard? Does the P-661HW-D support DDNS
wildcard?
Some DDNS servers support the wildcard feature which allows the hostname,
*.yourhost.dyndns.org, to be aliased to the same IP address as
yourhost.dyndns.org. This feature is useful when there are multiple servers
inside and you want users to be able to use things such as
www.yourhost.dyndns.org and still reach your hostname.
Yes, the P-661HW-D supports DDNS wildcard that http://www.dyndns.org/
supports. When using wildcard, you simply enter yourhost.dyndns.org in the
Host field in Menu 1.1 Configure Dynamic DNS.
12. Can the P-661HW-D's SUA handle IPSec packets sent by the IPSec
gateway?
Yes, the P-661HW-D's SUA can handle IPSec ESP Tunneling mode. We know
when packets go through SUA, SUA will change the source IP address and
source port for the host. To pass IPSec packets, SUA must understand the
ESP packet with protocol number 50, replace the source IP address of the
IPSec gateway to the router's WAN IP address. However, SUA should not
change the source port of the UDP packets which are used for key
managements. Because the remote gateway checks this source port during
connections, the port thus is not allowed to be changed.

13. How do I setup my P-661HW-D for routing IPSec packets over SUA?

For outgoing IPSec tunnels, no extra setting is required.
15
All contents copyright © 2006 ZyXEL Communications Corporation.