NETGEAR SRX5308 - ProSafe® Quad WAN Gigabit SSL VPN Firewall Reference Manual page 52

ProSafe Gigabit Quad WAN SSL VPN Firewall SRX5308 Reference Manual
If your network has a permanently assigned IP address, you can register a domain name and have
that name linked with your IP address by public Domain Name Servers (DNS). However, if your
Internet account uses a dynamically assigned IP address, you will not know in advance what your
IP address will be, and the address can change frequently—hence, the need for a commercial
DDNS service, which allows you to register an extension to its domain, and restores DNS requests
for the resulting FQDN to your frequently changing IP address.
After you have configured your account information on the VPN firewall, when your ISP-assigned
IP address changes, your VPN firewall automatically contacts your DDNS service provider, logs
in to your account, and registers your new IP address. Consider the following:
• For auto-rollover mode, you need a fully qualified domain name (FQDN) to implement
features such as exposed hosts and virtual private networks regardless of whether you have a
fixed or dynamic IP address.
• For load balancing mode, you might still need a fully qualified domain name (FQDN) either
for convenience or if you have a dynamic IP address.
Note: If your ISP assigns a private WAN IP address such as 192.168.x.x or 10.x.x.x, the
DDNS service does not work because private addresses are not routed on the
Internet.
To configure DDNS:
1. Select Network Configuration > Dynamic DNS from the menu. The Dynamic DNS screen
displays (see Figure 2-19 on page
The WAN Mode section on the screen reports the currently configured WAN mode (for
example, Single Port WAN1, Load Balancing, or Auto Rollover). Only those options that
match the configured WAN mode are accessible on the screen.
2. Select the submenu tab for your DDNS service provider:
• Dynamic DNS (which is shown in
• DNS TZO for TZO.com
• DNS Oray for Oray.net
• 3322 DDNS for 3322.org
2-28
2-29).
Figure 2-19 on page
Connecting the VPN Firewall to the Internet
v1.0, April 2010
2-29) for DynDNS.org