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This follows the Rev A US manual, version 3.01, dated April 24, 2018. It documents 192.168.17.1 for Ethernet and a different address for micro-USB. These instructions do not establish Rev B behavior.

Open this local interface

On the modem's authorized Ethernet network, enter 192.168.17.1 in the browser address bar after confirming it is the installation's management address.

Use admin with the current management password. The initial password is on the modem's rear label; a changed password takes precedence. The reviewed access instructions specify no numeric scheme or port.

Read Home status

After login, Home shows LTE connection and system information, including LTE Signal Strength. Inspect these values without using Device Reset or advanced configuration.

If access fails

Confirm the Ethernet interface, same IP subnet and existing link lights. Internet access is not required for this local utility. Ask the administrator for the current password; do not open the case, reset the modem or disable security software.

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Sources & further reading
D-Link DWM-311 Rev A User Manual, version 3.01, April 24, 2018