Supported basic network services and their default port numbers
For Digi devices with multiple serial ports, the network port number defaults for various services are set based on the following formula:
base network port number + serial port number
The assumed default base is 2000. For example, the telnet passthrough service is set to network port 2001 for serial port 1, 2002 for serial port 2, and 2003 for serial port 3, and so on.
If you change a network port for a particular service, that is the only network port number that changes. That change does not carry over to the other network ports. For example, if you change the network port number for telnet passthrough from 2001 to 3001, that does not mean that the other network ports changes to 3002, 3003, and so on.
There are two types of network services available:
- Basic services: You can access these services by connecting to a particular well-known network port.
-
Passthrough services: You can set up a specific type of service for a specific serial port. To use the service, you must use the correct protocol and specify the correct network port. For example, assuming default service ports and using a Linux host, here is how a user would access the SSH and telnet passthrough services on port 1:
#> ssh -l fred digi16 -p 2501 #> telnet digi16 2101
The following table shows the network services, services provided, and the default network port number for each service.
| Service | Services provided | Default network port number |
|
Device Discovery, also known as Advanced Digi Discovery Protocol (ADDP) |
Discovery of Digi devices on a network. Disabling this service disables use of the Digi Device Discovery utility to locate the device. You cannot change the network port number for ADDP from its default. |
2362 |
|
Encrypted (Secure) RealPort |
Secure Ethernet connections between COM or TTY ports and device servers or terminal servers. |
1027 |
|
RealPort |
A virtual connection to serial devices no matter where they reside on the network. |
771 |
|
Line Printer Daemon (LPD) |
Allows network printing over a serial port. |
515 |
|
Modem Emulation Pool (pmodem) |
Allows the Digi device to emulate a modem. Modem emulation sends and receives modem responses to the serial device over the Ethernet instead of Public Switched Telephone Network (PSTN). You can enable or disable telnet processing on the incoming and outgoing modem-emulation connections. The pmodem service is for connecting to whatever serial port will answer. |
50000 |
|
Modem Emulation Passthrough |
Allows the Digi device to emulate a modem. This service is for dialing in to a particular serial port that has been set up for modem emulation. |
50001 |
|
Remote login (rlogin) |
Allows users to sign in to the Digi device and access the command-line interface through rlogin. |
513 |
|
Remote shell (Rsh) |
Allows users to sign in to the Digi device and access the command-line interface through Rsh. |
514 |
|
Secure Shell Server (SSH) |
Allows users secure access to sign in to the Digi device and access the command-line interface. |
22 |
|
Secure Shell (SSH) Passthrough |
Accessing a specific serial port set up for SSH. |
2501 |
|
Secure Socket Service |
Authentication and encryption for Digi devices. |
2601 |
|
Simple Network Management Protocol (SNMP) |
Managing and monitoring the Digi device. To run SNMP in a more secure manner, SNMP allows for set commands to be disabled. This securing is done in SNMP itself, not through Network Services settings. If disabled, SNMP services such as traps and device information are not used. |
161 |
|
Telnet Server |
Allows users an interactive telnet session to the Digi device’s command-line interface. If disabled, users cannot telnet to the device. |
23 |
|
Telnet Passthrough |
Allows a telnet connection directly to the serial port, often called reverse telnet. The format for this port number is as follows: 20<serial port number> Replace <serial port number> with the Digi serial port number. For example, 2001 applies to serial port 1, 2010 applies to serial port 10, and 2016 applies to serial port 16. |
2001 |
|
Transmission Control Protocol (TCP) Echo |
Used for testing the ability to send and receive over a TCP connection, similar to a ping. |
7 |
|
Transmission Control Protocol (TCP) Passthrough |
Allows a raw socket connection directly to the serial port, often called reverse sockets. The format for this port number is as follows: 21<serial port number> Replace <serial port number> with the Digi serial port number. For example, 2101 applies to serial port 1, 2110 applies to serial port 10, and 2116 applies to serial port 16. |
2101 |
|
User Datagram Protocol (UDP) Echo |
Used for testing the ability to send and receive over a UDP connection, similar to a ping. |
7 |
|
User Datagram Protocol (UDP) Passthrough |
Allows raw data to be passed between the serial port and UDP datagrams on the network. The format for this port number is as follows: 21<serial port number> Replace <serial port number> with the Digi serial port number. For example, 2101 applies to serial port 1, 2110 applies to serial port 10, and 2116 applies to serial port 16. |
2101 |
|
Web Server, also known as HyperText Transfer Protocol (HTTP) |
You can establish secure access to configuration web pages by requiring a user to sign in. HTTP and HTTPS are also called Web Server or Secure Web Server. These services control the use of the web interface. If HTTP and HTTPS are disabled, device users cannot use the web interface to configure, monitor, and administer the device. |
80 |
|
Secure Web Server, also known as HyperText Transfer Protocol over Secure Socket Layer (HTTPS) |
You can secure access to configuration web pages by requiring a user to sign in with encryption for greater security. |
443 |
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