DGFV338 ProSafe Wireless ADSL Modem VPN Firewall Router Reference Manual
Basic Installation and Configuration
2-19
v1.0, May 2008
•
Select
Ping to this IP address
and enter an IP address.
5.
(Optional) You can change the
Test Period
and
Failover
count. The default time to roll over
after the primary WAN interface fails is 2 minutes (a 30 second test period with a minimum of
four sequential failed tests).
6.
Click
Apply
to save the configuration.
Configuring Dynamic DNS
If your network has a permanently assigned (static or fixed) public 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. In this case,
you can use a commercial dynamic DNS service, which allows you to register an extension to its
domain, and resolves DNS requests for the resulting FQDN to your frequently-changing IP
address.
For Auto-Rollover WAN mode, you will 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.
The DGFV338 contains a client that can connect to a dynamic DNS (DDNS) service provider. To
use this feature, you must select a DDNS service provider and obtain an account with them. After
you have configured your account information in the DGFV338, whenever your ISP-assigned IP
address changes, your DGFV338 will automatically contact your DDNS service provider, log in to
your account, and register your new IP address.
Note:
If your ISP assigns a private WAN IP address such as 192.168.x.x or 10.x.x.x, the
dynamic DNS service will not work because private addresses will not be routed
on the Internet.
