Help - Virtual Servers


  Descriptions
Virtual Server The "Virtual Servers" feature allows Internet Users to access PCs on your LAN.
The PCs must be running the appropriate Server Software.
For Internet Users, ALL of your Servers have the same IP address. This IP address is allocated by your ISP.
DDNS

To make it easier for Internet users to connect to your Servers, you can use the "DDNS" feature. This allows Internet users to connect to your Servers with a URL, rather than an IP address. This technology works even if your ISP allocates dynamic IP addresses (IP address is allocated upon connection, so it may change each time you connect).

Note: You'll need to apply for a DDNS name from www.dyndns.org. See Help-DNNS for more info

You can configure the TVP-224HR so that you can allow Internet users access to resources and devices on your LAN. Remote users accessing LAN side services such as the Web or FTP on your local site using Dynamic Domain Name or Public IP Addresses. Requests can be automatically redirected to local servers allocated with Private IP Addresses. In other words, depending on the requested service (TCP/UDP) port number, TVP-224HR redirects the external service request to the appropriate internal server (located at one of your LAN's Private IP Addresses). Some of the more common applications and protocol/port number mappings are defined below:

Application      Protocol     Port Number   
Telnet
TCP
23
SMTP
TCP
25
POP3
TCP
110
H.323
TCP
1720
SNMP
UDP
161
SNMP Trap
UDP
162
HTTP
TCP
80
FTP
TCP
21
PC Anywhere (control)   
TCP
5631
PC Anywhere (data)
UDP
5632

 


Help - Port Forwarding

Port Forwarding is used when a communication port range is required by a specific application. Port forwarding in the TVP-224HR can reserve these communication ports on your network. When users from the Internet make certain requests on your network, TVP-224HR can forward those requests to specific computers that are equipped to handle the requests.

For example, if you set the port number 80 (HTTP) to be forwarded to the IP Address 192.168.0.2, then all HTTP requests from outside users will be forwarded to 192.168.0.2.

Up to 10 application profiles can be configured in the Port Forwarding menu of the TVP-224HR.

 


Help - Special Applications

Special Applications configuration is used for internet applications which have difficulty transersing the built-in firewall.
If an Internet application does not work, you can try mapping it here. You will need detailed information about the application from the provider of the service or application.
Note that the terms "Incoming" and "Outgoing" refer to traffic from the client (PC) viewpoint.
If the application can't be made to work, you could also try the "DMZ" feature.

 


Help - DMZ

If an internet application does not work, try using the "Port Forwarding", "Virtual Server " and / or "Special Applications" mapping features supported by the TVP-224HR. If these features do not work, then the DMZ feature can be used.

The "DMZ" PC will receive all "Unknown" connections and data. The DMZ PC is in effect outside the Firewall, making it vunerable to attacks. For this reason, you should only enable the DMZ feature when required. If DMZ is enabled, you must select a PC to be used as the "DMZ" PC. Only one PC can be set to DMZ at a time.

 


Help - DDNS

This free service, when combined with the TVP-24HR "Virtual Server" feature (or DMZ feature) is very useful. It allows Internet users to connect to your Virtual Servers (or DMZ PC) using a static URL, rather than an IP Address. This is particularly useful because a dynamic IP address, by definition, is constantly changing making it difficult for internet users to find you.

The Service works as follows:

  1. Obtain a free account for the service by registering at http://www.dyndns.org.
  2. www.dyndns.org will automatically notify you confirming your account information.
  3. Return to http://www.dyndns.org and use the "Create New Host" option to register your preferred Domain name. It is recommended that you register a name within the xxxx.dyndns.org hostname.
  4. Details of your http://www.dyndns.org account (Name, password, Domain name) must then be entered and saved in the DDNS page of the TVP-224HR. The TVP-224HR will then automatically notify DynDNS of your changing IP Address and DynDNS will in turn, map it to your registered Domain Name. Internet users will now be able to easily connect to your Virtual Servers (or DMZ PC) using your easy to remember Domain name.