On 13/11/2016 04:09, Andrew Lunn wrote: > Mason wrote: > >> When connected to a Gigabit switch >> 3.4 negotiates a LAN DHCP setup instantly >> 4.7 requires over 5 seconds to do so > > When you run tcpdump on the DHCP server, are you noticing the first > request is missing? > > What can happen is the dhclient gets started immediately and sends out > its first request before auto-negotiation has finished. So this first packet > gets lost. The retransmit after a few seconds is then successful.
I will run tcpdump on the server as I run udhcpc on the client for Linux 3.4 vs 4.7 Do you know what would make auto-negotiation fail at 100 Mbps on 4.7? (whereas it succeeds on 3.4) (Thinking out loud) If the problem were in auto-negotiation, then if should work if I hard-code speed and duplex using ethtool, right? (IIRC, hard-coding doesn't help.) Regards.
