ARP Issue May be.

[astirabaloch]

Hello, I hope you are doing great. Thanks for the great IP.
I am using your IP for implementing something on top of it and got in to a scenario that I am unable to troubleshoot as I am not good with the networks.
Here are the scenarios:
1- I am sending the udp data from a device with IP x to a computer with IP y. Computer is set to "Obtain IP automatically". In this scenario If I set the destination IP to z it sends the data correctly without any ARP request after changing the destination IP.
2 - If I change the Computer to a static IP configuration, with IP x and static IP y, data sending works but as soon as I change the destination IP to z data sending does not work as device send the ARP request for that IP.
In first scenario the destination MAC address remains same irrespective of device's IP.

For both scenarios I am using point to point connection. There is no router or switch in between.