ARP return for disconnected eth1 IP address

[hattons]

@ken_yap

Maybe it’s gratuitous because eth0 is on a different subnet and that subnet normally would not care about other subnets. It looks like hostone decided to tell everyone that it has that IP address, albeit on a different interface. Sorry, your guess is as good as mine why the networking stack behaves that way. Maybe there’s a kernel control to suppress this behaviour, dunno.

That’s what I suspected. So I tested and found that I get the same thing even if both eth1’s are connected to the LAN. My senior colleague suggested that it’s a flaw in WireShark. Perhaps I should ask on one of their forums.

But that is a side issue. I read the ARP RFP, and it provided no insight into the original question.