Configure telnet access

By default, the telnet service is disabled.

Note Telnet is an insecure protocol and should only be used for backward-compatibility reasons, and only if the network connection is otherwise secured.

Required configuration items

Additional configuration items

See Set the idle timeout for IX30 users for information about setting the inactivity timeout for the telnet service.

 

The telnet service is disabled by default. To enable the service:

  Web

  1. Log into Digi Remote Manager, or log into the local Web UI as a user with full Admin access rights.
  2. Access the device configuration:

    1. Locate your device as described in Use Digi Remote Manager to view and manage your device.
    2. Click the Device ID.
    3. Click Settings.
    4. Click to expand Config.

    1. On the menu, click System. Under Configuration, click Device Configuration.

      The Configuration window is displayed.

  3. Click Services > telnet.
  4. Click Enable.
  5. Click Apply to save the configuration and apply the change.

  1. Select the device in Remote Manager and click Actions > Open Console, or log into the IX30 local command line as a user with full Admin access rights.

    Depending on your device configuration, you may be presented with an Access selection menu. Type admin to access the Admin CLI.

  2. At the command line, type config to enter configuration mode:
    > config
(config)>
  3. Enable the telnet service:
    (config)> service telnet enable true
(config)>
  4. Save the configuration and apply the change
    (config)> save
Configuration saved.
>
  5. Type exit to exit the Admin CLI.

    Depending on your device configuration, you may be presented with an Access selection menu. Type quit to disconnect from the device.

  1. Log into Digi Remote Manager, or log into the local Web UI as a user with full Admin access rights.
  2. Access the device configuration:

    1. Locate your device as described in Use Digi Remote Manager to view and manage your device.
    2. Click the Device ID.
    3. Click Settings.
    4. Click to expand Config.

    1. On the menu, click System. Under Configuration, click Device Configuration.

      The Configuration window is displayed.

  3. Click Services > telnet.
  4. (Optional) For Port, enter the port number for the service. Normally this should not be changed.
    • To limit access to specified IPv4 addresses and networks:
      1. Click IPv4 Addresses.
      2. For Add Address, click .
      3. For Address, enter the IPv4 address or network that can access the device's telnet service. Allowed values are:
        • A single IP address or host name.
        • A network designation in CIDR notation, for example, 192.168.1.0/24.
        • any: No limit to IPv4 addresses that can access the telnet service.
      4. Click again to list additional IP addresses or networks.
    • To limit access to specified IPv6 addresses and networks:
      1. Click IPv6 Addresses.
      2. For Add Address, click .
      3. For Address, enter the IPv6 address or network that can access the device's telnet service. Allowed values are:
        • A single IP address or host name.
        • A network designation in CIDR notation, for example, 2001:db8::/48.
        • any: No limit to IPv6 addresses that can access the telnet service.
      4. Click again to list additional IP addresses or networks.
    • To limit access to hosts connected through a specified interface on the device:
      1. Click Interfaces.
      2. For Add Interface, click .
      3. For Interface, select the appropriate interface from the dropdown.
      4. Click again to allow access through additional interfaces.
    • To limit access based on firewall zones:
      1. Click Zones.
      2. For Add Zone, click .
      3. For Zone, select the appropriate firewall zone from the dropdown.

        See Firewall configuration for information about firewall zones.

      4. Click again to allow access through additional firewall zones.
  6. Multicast DNS (mDNS) is disabled by default. mDNS is a protocol that resolves host names in small networks that do not have a DNS server. To enable mDNS, click Enable mDNS.
  7. Click Apply to save the configuration and apply the change.
  1. Select the device in Remote Manager and click Actions > Open Console, or log into the IX30 local command line as a user with full Admin access rights.

    Depending on your device configuration, you may be presented with an Access selection menu. Type admin to access the Admin CLI.

  2. At the command line, type config to enter configuration mode:
    > config
(config)>
  3. Configure access control:
    • To limit access to specified IPv4 addresses and networks:
      (config)> add service telnet acl address end value
(config)>

      Where value can be:

      • A single IP address or host name.
      • A network designation in CIDR notation, for example, 192.168.1.0/24.
      • any: No limit to IPv4 addresses that can access the telnet service.

      Repeat this step to list additional IP addresses or networks.

    • To limit access to specified IPv6 addresses and networks:
      (config)> add service telnet acl address6 end value
(config)>

      Where value can be:

      • A single IP address or host name.
      • A network designation in CIDR notation, for example, 2001:db8::/48.
      • any: No limit to IPv6 addresses that can access the telnet service.

      Repeat this step to list additional IP addresses or networks.

    • To limit access to hosts connected through a specified interface on the IX30 device:
      (config)> add service telnet acl interface end value
(config)>

      Where value is an interface defined on your device.

      Use ... network interface ? to display interface information:

      (config)> ... network interface ?

Interfaces

Additional Configuration
-------------------------------------------
 defaultip              Default IP  
 defaultlinklocal       Default Link-local IP
 eth1                   ETH1
 eth2                   ETH2
 loopback               Loopback 
 modem                  Modem 

(config)>

      Repeat this step to list additional interfaces.

    • To limit access based on firewall zones:
      (config)> add service telnet acl zone end value
(config)>

      Where value is a firewall zone defined on your device, or the any keyword.

      Type ... firewall zone ? at the config prompt:

      (config)> ... firewall zone ?

Zones: A list of groups of network interfaces that can be referred to by packet
filtering rules and access control lists.

 Additional Configuration
 -------------------------------------------------------------------------------
  any
  dynamic_routes
  edge
  external
  internal
  ipsec
  loopback
  setup

(config)>

      Repeat this step to include additional firewall zones.

  4. mDNS is a protocol that resolves host names in small networks that do not have a DNS server. mDNS is disabled by default. To enable:

    (config)> service telnet mdns enable true
(config>

  5. The default setting of 23 normally should not be changed.

    (config)> service telnet port 25
(config)>

  6. Save the configuration and apply the change
    (config)> save
Configuration saved.
>
  7. Type exit to exit the Admin CLI.

    Depending on your device configuration, you may be presented with an Access selection menu. Type quit to disconnect from the device.