Well, I'm no DHCP expert either Looking at the source and checking RFC-2131, REBOOTING state only needs to verify an existing lease. That can be done by issuing a DHCPREQUEST message with the known ip address. Coherency suggests that given the address is correct, then the client already has all necessary parameters correct, obtained from last request. I would say the problem lies on that subject. Somehow that is not working. Please post a network capture showing first DHCPREQUEST on startup and then the link-down/link-up issue. Please post a log with DHCP debugging (:#define DHCP_DEBUG LWIP_DBG_ON)
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