A user must know the issues and circumstances in which the MTU ( maximum transmission unit) of a network should be changed. If a user is facing a sudden disconnection or slow data transfer issue on his network, he can change the MTU of a Dlink router using the dlinkrouter.local window. An incorrect MTU can affect the performance of your router that’s why a user is recommended to apply the default MTU in the provided field. The default MTU value of a Dlink router is 1499.

https://dlikrouterlocal.net/

dlinkrouter.local not working, connect your router with ethernet cable make sure internet is working fine. you can also use 192.16.0.1