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.
ICMP Behavior Over Different Subnetworks
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.
November 16, 2025 · 1 min read/ICMP/Networking/Curiosity