I have a host with a destination IP 172.16.10.24 on the same IP Class C and same ethernet segment as one network adapter of a Windows firewall whose IP is 172.16.10.5. I have a sniffer running on both firewall and destination host. I see the packet leave the 172.16.10.5 interface. A sniffer at
172.16.10.24 never sees the packet arrive.
This only happens for a single protocol. Other packets appear to travel the same path for different protocols and everything works.
How should I debug this to better understand where/how the packet is getting eaten?