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I have a simple setup of 3 computers connected with LAN cables to the same router.

I started a trace on computer2 but I can see traffic from the router intended for computer1. I am capturing on the standard Ethernet interface, the only one it has. The traffic isn't broadcast, in fact this is what one packet looks like:

Source          Src Port    Destination Dst Port    Protocol    Length  Info
119.23.52.119   51413       computer1   55764       TCP         60      51413 → 55764 [ACK] Seq=1 Ack=1 Win=11944 Len=0

In the Ethernet part of the packet I can see the source is the router's MAC address.

How is this possible?

I have a simple setup of 3 computers connected with LAN cables to the same Asus RT-AX55 router.

I started a trace on computer2 but I can see traffic from the router intended for computer1. I am capturing on the standard Ethernet interface, the only one it has. The traffic isn't broadcast, in fact this is what one packet looks like:

Source          Src Port    Destination Dst Port    Protocol    Length  Info
119.23.52.119   51413       computer1   55764       TCP         60      51413 → 55764 [ACK] Seq=1 Ack=1 Win=11944 Len=0

In the Ethernet part of the packet I can see the source is the router's MAC address.

How is this possible?