Re: [lwip-users] DHCP discovery

[Mandeep Sandhu]

On Wed, Jul 29, 2009 at 2:30 PM, Baptiste
Chaboud-crousaz<address@hidden> wrote:
> Hi all,
>
> My firmware is made of a bootloader and an application. Only one is running
> at a time but both start by initializing the lwip stack and launching a DHCP
> discovery in order to get an IP address.
>
> In the case of my application is running an IP address is assigned to my
> application. Then, it is possible to jump from my application to my
> bootloader. The bootloader will re-inits the lwip stack and calls DHCP for
> an IP address: when I sniff my network, I see that the bootloader sends a
> DHCP discovery. My problem is that I want that my bootloader keeps the same
> IP address that was assigned to my application. My understanding of the DHCP
> protocol is that a DHCP client can propose an IP address to the DHCP server;
> in this case, the DHCP client has to send a DHCP request instead of a DHCP

Not really. The client can send it's last known/preferred IP in the
DHCP discovery
packet itself. See DHCP option 50.

HTH,
-mandeep

> discovery. Does lwip support this feature? How? How should I do to keep the
> same IP address for my application and bootloader?
>
> Thanks.
>
> Baptiste
>
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