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Advanced > Virtual Server
Using the Configuration Menu (continued)
The DI-774 can be configured as a virtual server so that remote users accessing Web
or FTP services via the public IP Address can be automatically redirected to local
servers in the LAN (Local Area Network).
The DI-774 firewall feature filters out unrecognized packets to protect your LAN
network so all computers networked with the DI-774 are invisible to the outside world.
If you wish, you can make some of the LAN computers accessible from the Internet
by enabling
Virtual Server.
Depending on the requested service, the DI-774 redirects
the external service request to the appropriate server within the LAN network.
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Advanced > Virtual Server
continued
Using the Configuration Menu (continued)
The DI-774 is also capable of port-redirection meaning incoming traffic to a particular
port may be redirected to a different port on the server computer.
Each virtual service that is created will be listed at the bottom of the screen in the
Virtual Servers List. There are pre-defined virtual services already in the table. You
may use them by enabling them and assigning the server IP to use that particular
virtual service.
Example #1:
If you have a Web server that you wanted Internet users to access at all times, you
would need to enable it. Web (HTTP) server is on LAN (Local Area Network)
computer 192.168.0.25. HTTP uses port 80, TCP.
Name: Web Server
Private IP: 192.168.0.25
Protocol Type: TCP
Private Port: 80
Public Port: 80
Schedule: always
Protocol Type-
The protocol used for the virtual service
Public Port-
The port number on the WAN (Wide Area Network)side that will
be used to access the virtual service.
Private Port-
The port number of the service used by the Private IP computer
Schedule
-
The schedule of time when the virtual service will be enabled.
The schedule may be set to
Always
, which will allow the
particular service to always be enabled. If it is set to
Time
,
select the time frame for the service to be enabled. If the
system time is outside of the scheduled time, the service will
be disabled.
Virtual Server-
Select
Enabled
or
Disabled
Name-
Enter the name referencing the virtual service
Private IP-
The server computer in the LAN (Local Area Network) that will be
providing the virtual services.
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Example #2:
If you have an FTP server that you wanted Internet users to access by WAN port
2100 and only during the weekends, you would need to enable it as such. FTP
server is on LAN computer 192.168.0.30. FTP uses port 21, TCP.
Name: FTP Server
Private IP: 192.168.0.30
Protocol Type: TCP
Private Port: 21
Public Port: 2100
Schedule: From: 01:00AM to 11:00PM, Sat to Sun
Using the Configuration Menu (continued)
Advanced > Virtual Server
continued
Click on this icon to edit the virtual service
Click on this icon to delete the virtual service
All Internet users who want to access this FTP Server
must connect to it from port 2100. This is an example of
port redirection and can be useful in cases where there
are many of the same servers on the LAN network.
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Using the Configuration Menu (continued)
Advanced > Applications
Some applications require multiple connections, such as Internet gaming, video
conferencing, Internet telephony and others. These applications have difficulties
working through NAT (Network Address Translation). Special Applications makes
some of these applications work with the DI-774. If you need to run applications that
require multiple connections, specify the port normally associated with an application
in the “Trigger Port” field, select the protocol type as TCP or UDP, then enter the
public ports associated with the trigger port to open them for inbound traffic.
The DI-774 provides some predefined applications in the table on the bottom of the
web page. Select the application you want to use and enable it.
Note!
Only one PC can use each Special Application tunnel.
Name:
This is the name referencing the special application.
Trigger Port:
This is the port used to trigger the application. It can be either
a single port or a range of ports.
Trigger Type:
This is the protocol used to trigger the special application.
Public Port:
This is the port number on the WAN side that will be used to
access the application. You may define a single port or a
range of ports. You can use a comma to add multiple ports or
port ranges.
Public Type:
This is the protocol used for the special application.
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Using the Configuration Menu (continued)
Advanced > Filters > IP Filters
Filters are used to deny or allow LAN (Local Area Network) computers from accessing
the Internet. The DI-774 can be setup to deny internal computers by their IP or MAC
addresses. The DI-774 can also block users from accessing restricted web sites.
This is the schedule of time when the IP Filter will be enabled.
Schedule-
Select the protocol type
Protocol Types-
The single port or port range that will be denied access to the
Internet.
Port-
Use IP Filters to deny LAN IP Addresses from accessing the
Internet. You can deny specific port numbers or all ports for
the specific IP Address.
IP Filters-
The IP Address of the LAN computer that will be denied
access to the Internet.
IP-

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