necessary ARP request?

Hello,

I have 2 clients with Unix installed.
host1: eth0 (192.168.5.10) & eth1 (192.168.10.10)
host2: eth0 (192.168.10.20)

I've connected host1-eth1 to host2-eth0. host1-eth0 isn't connected.

I started 'tcpdump' on wonder that host2 got ARP requests for 192.168.5.10.
Any idea why host1 asks for an IP of own system?

A smart DHCP client is paranoid and doesn't trust the values its given. It checks if they're occupied, first. (run dhcpcd manually, it'll even tell you it's doing so...)

Which is why a process which is theoretically near-instant can take many tedious seconds.

thank you..