Re: [lwip-users] No delay between DHCP discoveries

[Robert]

On Thu, 2013-10-03 at 08:56 -0700, HA wrote:
> I have inherited a project that uses lwip 1.3.0 running on a Stellaris CPU.
> Compiler is Codesourcery light so no real debugger except for GDB in
> textmode. Most things work OK but if I dont't have a DHCP server the board
> sends out 23 DHCP discovery per second. If we have hundreds or thousand
> devices on the network the situation after a power failure is catastrophic
> because no one can commuinacte with the DHCP server.
> 
> I have compared the dhcp.c with the original, no difference. Most things in
> the config looks normal. DHCP works, static IP works and the webserver runs.
> 
> The code clearly shows that there should an exponential back off of DHCP
> discoveries but it does not work.

Sounds like a timing issue.  Check on (my values are given):

DHCP_COARSE_TIMER_SECS   60 
DHCP_FINE_TIMER_MSECS    500


Robert

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