I have my pi set to use either wired or wifi with both interfaces on DHCP.
If I am using the wireless connection then every so often in syslog I see an attempt to get an eth0 address. It would seem the pi can't tell there is no cable plugged in.
Again on wifi it seems to take longer to boot. I suspect it is waiting for the DHCP request on eth0 to timeout before carrying on. On another OS I can tell DHCP to return at once rather than waiting for a timeout.
Anything I can tweak to help either situation?
TIA