[lwip-devel] [bug #30038] dhcp_network_changed doesn't reset AUTOIP coop state

[Bill Auerbach]

Follow-up Comment #12, bug #30038 (project lwip):

> BTW: I almost released a product with that, too :-)

Well, I did release it - to a trade show where this would not have been
detected.  I'm not sure why I didn't see this still and I'm bothered by it.  I
did a lot of testing of cable changes, DHCP to static to AutoIp changes all
around and didn't see it.

Since you're in dhcp_network_changed - if you want to be really complete with
it, the following should be added:

if(!dhcp) {
  dhcp_inform(netif);
  return;
}

If there is no DHCP server running (dhcp_start wasn't used - e.g. application
using static IP) then a network change will inform the network of the static
IP address.  If you do this, one benefit is Windows will detect duplicate IPs
and "balloon" a warning.

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