Advanced Settings
60
C3000 WiFi Cable Modem Router
7.
In the Service Name field, type a descriptive service name. No spaces are allowed for the
service name field.
8.
In the Service User list, select
Any
(the default) to allow any computer on the Internet to use
this service. Otherwise, select
Single address
, and enter the IP address of one computer to
restrict the service to a particular computer.
9.
Select the service type, either
TCP
or
UDP
or both (
TCP/UDP
). If you are not sure, select
TCP/UDP.
10.
In the Triggering Port field, enter the number of the outbound traffic port that causes the
inbound ports open.
11.
Enter the inbound connection port information in the Connection Type, Starting Port, and
Ending Port fields.
12.
Click the
Apply
button.
The service displays in the Port Triggering Portmap table.
Dynamic DNS
If your Internet service provider (ISP) gave you 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 do not know in advance what your IP address is, and the address can change
frequently. In this case, you can use a commercial Dynamic DNS service. This type of service
lets you register your domain to their IP address and forwards traffic directed at your domain
to your frequently changing IP address.
If your ISP assigns a private WAN IP address (such as 192.168.x.x or 10.x.x.x), the Dynamic
DNS service does not work because private addresses are not routed on the Internet.
Your modem router contains a client that can connect to the Dynamic DNS service that
DynDNS.org provided. First visit their website at
http://www.dyndns.org
and obtain an
account and host name that you configure in the modem router. Then, whenever your
ISP-assigned IP address changes, your modem router automatically contacts the Dynamic
DNS service provider, logs in to your account, and registers your new IP address. If your host
name is hostname, for example, you can reach your modem router at
http://hostname.dyndns.org
.
To set up Dynamic DNS:
1.
From the Advanced tab, select
Advanced Setup > Dynamic DNS
.