Re: [lwip-users] Passing ARP replies to host

[Amena El Homsi]

Thanks for your reply. So if I want to support it I have to add some changes to etharp.c file. Is there a plan to support such feature?

On Mon, Nov 5, 2018 at 6:27 PM address@hidden <address@hidden> wrote:

On 05.11.2018 16:35, Amena El Homsi wrote:
> LwIP processes the ARP requests and replies updated the ARP table,
> then it calls pbuf_free().
> Is there a way to send the ARP reply to the host when the host
> requested lwIP to send an ARP request?

No.

> I was thinking to use raw pcb and define a raw callback function that
> will inform the host of the result of the ARP request, however
> raw_input() is not called unless ip4_input is called and since the arp
> will be processed by etharp_input I will not be able to use raw_pcb.

As you have found out yourself, raw pcbs are raw IP pcbs, not raw
network packets. It's like that in the socket world...

Simon

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Amena El-Homsi

Computer & Communication Engineer

Dipl. Eng,  M.S.