Why is the connection strange when changing the IP address?

Question

Mikrotik

Good afternoon.
Such situation. There is a working Mikrotik RB951G-2HnD. Everything is set up, everything works. The computer address was handwritten 192.168.1.5. It was impatient to play with cisco 881, but it was not possible to solve the task of viewing PeersTV on home TVs on it, and Mikrotik was plugged in again. When the work went through the cisco, the computer received the address 192.168.1.9 via dhcp, then during experiments with pens it was registered in the same 1.9 (without dhcp). When returning to the place of Mikrotik, the address on the computer remained 1.9, and here oddities began. When pinging any external address, packet loss reached 10%, winbox connected to Mikrotik, but literally fell off after 5-10 seconds. But when the address 1.5 was registered on the computer again, everything worked stably and stopped falling off or losing packets.
I looked at everything on Mikrotik, there is no link to 1.5 anywhere.
What could be the reason for this behavior and whose bad behavior is it - a computer or Mikrotik?

Answer 1

Resolved: I forgot that the address 1.9 for the media player was hardcoded on Mikrotik, so after disconnecting the cisco and connecting back to the Mikrotik network, there was a conflict between Dune and the computer.

Answer 2

clear IP - ARP - ARPList