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[lwip-devel] DHCP and bad OFFER
From: |
Esa Hill |
Subject: |
[lwip-devel] DHCP and bad OFFER |
Date: |
Wed, 20 Dec 2017 09:04:23 +0000 |
Hello,
DHCP implementation seems to have minor bug. If DHCP server sends OFFER without
Server Identifier-field, LwIP stops sending DISCOVER messages (one fieldbus
conformance tester does this).
I didn't check RFC what actually should be done in this case, but I think that
it should at least continue sending DISCOVERY messages.
In code before dhcp.c: dhcp_handle_offer() is called, DHCP timer is stopped
(dhcp->request_timeout = 0;), then
dhcp_handle_offer() just prints error if it rejects the OFFER.
We are still using 1.4.1 but master seems to have identical code for
dhcp_handle_offer().
br,
Esa Hill
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