Thank you for the reply. I'm having a small network for testing purposes as shown in the picture. Emulating devices on PC 1 and sending them to PC 2 through the gateway
Answers for your queries.
Are you clicking on the "Resolve neighbors" button?
Yes I did. It becomes 0/1 or 0/2 as arp resolving process fails.
Is it triggering a bunch of ARP requests?
Were you able to verify that by capturing the ARP requests?
Yes it shows ARP requests when I check from wireshark in PC 1. But not receiving any responses.
Is Wireshark flagging any errors in the ARP request packets?
I could not see any errors.
How do you know that the ARP requests are not arriving at the gateway?
I actually assumed that the arp packets are not getting delivered and hence the responses are not coming. I can't see any reason why they don't respond if it arrives.
Is there a L2 device like a switch between Ostinato and the gateway or are they directly connected?
No. The gateway is the 5G modem and it has a wireless interface. The default gateway of PC 1 and PC 2 are both set to the ip address of the modem.
Also, I had to provide the destination MAC address manually in order to make it error free. It could not resolve the MAC address by itself. I would also like to know whether is there any way to set the MAC address of the default gateway manually also?