Can a static IP address be allocated to a 3G Cellular interface

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In general, the IP address of a 3G Cellular interface is dynamically allocated by the network device. Allocating a static IP address to a 3G Cellular interface may result in dial-up failures.

Other related questions:
Can a static IP address be configured for a 3G cellular interface
Configuring a static IP address for a 3G cellular interface may cause dialup to fail. In most cases, a network-side device dynamically allocates an IP address to a 3G cellular interface.

Can a static IP address be allocated to different clients
S series switches except S1700 switches do not assign IP addresses in use to clients. Before assigning an IP address to a client, a switch functioning as the DHCP server sends ping packets to the IP address to prevent IP address conflicts. You can run the dhcp server ping { packet number | timeout milliseconds } command in the system view to specify the maximum number of ping packets to be sent by a DHCP server and the maximum response time of a ping packet. If there is no response to the ping packet within the maximum response time, the DHCP server continues to send ping packets to this IP address until the number of ping packets reaches the maximum value. If there is still no response, this IP address is not in use and the DHCP server assigns the IP address to a client. This ensures that the IP address assigned to the client is unique.

Why does dialup often fail on a 3G cellular interface

The possible causes are as follows:

  • The 3G data card cannot be identified on the current network or is not supported on the AR.
  • The 3G data card does not match the current network. For example, authentication or service required on the current network is not enabled on the data card or USIM/SIM card. As a result, authentication or negotiation fails in dialup.
  • The 3G data card is not registered with available networks, due to weak signal strength or other reasons. Run the display cellular command to check information about 3G signals. The Current Service Status field must be displayed as "Service available", and the signal strength must be in the allowed range.
  • An incorrect connection mode is configured on the 3G data card. For example, the 3G data card has a SIM card installed but its connection mode is set to WCDMA-only.
  • The USIM/SIM card is not properly installed.
  • The 2G/3G services are not enabled on the USIM/SIM card.
  • The account balance of the USIM/SIM card is insufficient.
  • The USIM/SIM card works incorrectly. Run the display cellular command to check whether the USIM/SIM card is in correct state. The status of the USIM/SIM card must be Ok not Not insert.
  • Check whether 3G configurations, including the dialer number are correct. Check whether PPP authentication is required when the 3G cellular interface accesses a CDMA2000 network.
  • No profile is configured or a profile is incorrectly configured.
  • The 3G cellular interface is shut down using the shutdown command.

Why the physical interface status of a 3G cellular interface is Down

If the physical status of a 3G cellular interface (cellular interface) is Down, no 3G link is established and data service has not been transmitted yet. That is, no dialup is triggered or dialup fails on the 3G link.

NOTE:

If no dialup is triggered or dialup fails on a 3G link, the physical interface status is still Down even if a 3G data card (3G modem) is installed.


Can 3G/LTE be restored after remove interface-cellular is executed
To ensure information security, an administrator can run the remove interface-cellular command in the diagnostic view to shield the cellular interface on the AR so that common users cannot use the 3G or LTE function for communication. The configuration takes effect only after the AR restarts using the reboot command. After the configuration takes effect, the 3G or LTE function on the AR is unavailable and cannot be restored. Exercise caution when you run the remove interface-cellular command. After the configuration takes effect, you cannot run the remove interface-cellular command; otherwise, the AR displays an error message.

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