[lwip-devel] [bug #19927] DHCP NACK problem

[Jonathan Larmour]

Follow-up Comment #8, bug #19927 (project lwip):

The problem seems valid, but I'm not sure the fix is.

>From RFC2131 ( http://www.faqs.org/rfcs/rfc2131.html ) section 3.2.3: " If
the client receives a DHCPNAK message, it cannot reuse its remembered network
address."

That's not just for the DHCPDISCOVER (as per the original bug report) but
also for a dhcp_release. We should simply stop using the address, not do a
release. So I'm not sure, but I think dhcp_handle_nak should include:
  netif_set_down(netif);
  /* remove IP address from interface */
  netif_set_ipaddr(netif, IP_ADDR_ANY);
  netif_set_gw(netif, IP_ADDR_ANY);
  netif_set_netmask(netif, IP_ADDR_ANY);

Is there any reason the state machine is then only advanced in
dhcp_timeout(). Couldn't we call dhcp_discover directly?

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