In this scenario, I noticed that even if two routers’ interfaces are connected to each other but have different subnet masks, the ICMP messages (ping) are still working fine. Even if devices are in different subnets, ICMP can succeed if the device sends traffic to its default gateway, and the gateway resolves the MAC correctly via ARP.
Copyright Notice
Author: Rajkumar Neupane
Link: https://rajkumarneupane.com/posts/icmp-behavior-over-different-subnetworks/
License: CC BY-NC-SA 4.0
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.