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[lwip-devel] [bug #27049] DHCP IP address assignment with multiple lwIP

From: Jakob Stoklund Olesen
Subject: [lwip-devel] [bug #27049] DHCP IP address assignment with multiple lwIP devices fails
Date: Tue, 21 Jul 2009 21:40:57 +0000
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_7; en-us) AppleWebKit/530.19.2 (KHTML, like Gecko) Version/4.0.2 Safari/530.19 
Follow-up Comment #21, bug #27049 (project lwip):

I should say, I don't have a problem with increasing the dhcp retransmission
timeouts. In fact, RFC2131 ยง4.1 requires a randomized, exponential backoff
with an initial value suited to the network speed.

I suggest:

  msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;

That produces timeouts of 2, 4, 8, 16, 32, 60, 60, ... seconds.

Exponential backoff is better in the situation where many devices are turned
on simultaneously.


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