Can modifying the local host IP address cause business interruption for U1981?

dear, yes you can change the local host IP address but take in your considiration the precautions as follows:

changing IP for external communication:

The default IP address of the U1910/U1911/U1930/U1960/U1981 is 192.168.1.17, while the default IP address of the U1980 is 192.168.1.85. Their default gateway addresses are the same, which is 192.168.1.1.

Configurations vary depending on the actual data plan. The following assumes that you need to set the local IP address to 192.168.1.3, subnet mask to 255.255.255.0, gateway address to 192.168.1.3.

1. Log in to the web management system.
2. Choose System > Device Management from the navigation tree.
3. Click Configure next to IP address.
4. Change the local IP address, as shown in Figure 1.
   Figure 1 Configuration wizard page 
   
    NOTE:

   The IP address and gateway address must be on the same network segment.

5. Click OK.

   The message "Changing the local host IP address will restart the device. Are you sure you want to change the local host IPaddress?" is displayed. After the unified gateway is restarted, log in to the unified gateway using the new IP address.

Changing the IP Address for Internal Communication

The unified gateway IP address for internal communication (between boards) is 172.20.0.1x (V200R003) or 168.168.0.1x (V200R002 and V100R001). Here, x indicates the board slot number.

If IP address 172.20.0.1x or 168.168.0.1x exists in an external environment where the unified gateway is connected, the unified gateway regards the IP address as that for internal communication, and does not process messages sent from the IP address. As a result, the communication between the unified gateway and the IP address fails. In this case, change the unified gateway IP address for internal communication.

1. Check the IP address for internal communication.

   show inner networkip

   [%eSpace U1981(config)]#show inner networkip
   
   Current inner network IP is: 172.20.0.17, set to be: 172.20.0.17.
   
   ====  Command executed success !  ====

   The internal IP address of the main control board is checked in the preceding command. The default internal IP address for another slot number is 172.20.0.1x. Here, x indicates the board slot number.

2. Change the IP address for internal communication.

   Here, 172.16.0.1x is taken for example.

   config inner network ip 172.16.0.17

   [%eSpace U1981(config)]#config inner network ip 172.16.0.17
   
   Slot 7 inner IP set to be 172.16.0.17, Please reboot system to make it effective!
   
   ====  Command executed success !  ====

   When the internal IP address of the main control board is changed, the internal IP addresses for other slots are automatically changed.

3. Save the settings.

   save