Network Address Translation
Dlink DRO-220i User Guide
44
6.2
Virtual Server
Virtual Servers use NAPT (Network Address and Port Translation) to allow remote users
access certain special services on the LAN, such as FTP server for file transfer and STMP
or POP3 for e-mail. The administrator configures the Global IP address, TCP or UDP
protocol and port number used to access the Server. The router redirects requests from
the remote clients to the Internal Server running the specified service on the LAN, by
translating the Global IP/Port to the Private IP/Port of the end server.
Select
NAT
→
Virtual Server/NAPT
to configure the
Virtual Server/NAPT
as
explained below.
Virtual Server/NAPT
Interface Name
Select the interface on which the virtual server is to be configured.
Transport Type
Select the transport protocol (TCP or UDP) that the application on the
virtual server will use for its connections. The transport type is dependent
on the application that is providing the service. This is mostly used for
non-standard cases where the port numbers are defined by the
administrator.
Protocol
Select the appropriate application from the list. This selection is
equivalent to entering a correct transport type (TCP or UDP) and port
number for an application. For example, when SMTP is chosen transport
type TCP and port number 25 is automatically entered.
Private Settings
IP address
Enter the private IP address of the server that will provide the service to
remote users.
Port
Enter the private port number on which the server is running.
Global Settings
IP address
Enter the global IP address of the server. External world sees this global
IP address specified by the administrator.
Port
Enter the application port number (global) that is providing the service.
After entering all the information press the
Apply
button and the
Virtual Server
table
will now be displayed at the bottom. Each entry can be deleted by selecting the
Delete
button next to the entry.
6.3
SIP-ALG
Web UI
