Digi ConnectPort X4 User's Guide download pdf (Page 73)

Configuration through the web interface

– Forward TCP/UDP/FTP connections from external networks to the following

internal devices: Specifies a list of connections based on a specific IP port and where

those connections should be forwarded to. Typically the connecting devices come from

the public side of the network and are redirected to a device on the private side of the

network.

It is possible to forward a single port or a range of ports. To forward a range of

ports, specify the number of ports in the range, in the Range Port Count field for

the port forwarding entry. When a range is configured, the first port in the range is

specified, and the full range is indicated in the displayed entry information.

Note that FTP connections require special handling by NAT. This is because the

FTP commands and replies are character-based, and some of them contain port

numbers in this message text. Those embedded port numbers potentially need to be

translated by NAT as messages pass between the private and public sides of the

network. In consideration of these needs, one should select FTP as the protocol type

when configuring a rule for FTP connection forwarding to an FTP server on the

private network side. If TCP is used instead, FTP communications may not work

correctly. Note also that TCP port 21 is the standard port number for FTP. Finally,

the use of port ranges for FTP forwarding is not supported; a port count of 1 is

required.

Example

For example, to enable port forwarding of RealPort data (network port 771) on a Digi Connect

WAN VPN to a Digi Connect SP with an IP address of 10.8.128.10, you would do the following:

 Make sure the Enable IP Routing checkbox is checked.

 In the Forward TCP/UDP connections from external networks to the following

internal devices section, enter the port forwarding information as follows, and click

Add:

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Digi ConnectPort X4 User's Guide Page 73