Re: [lwip-users] LwIP Support - sethostaddr

[Jens Breuer]

Hi Enrico,

>> As an aside, typically when IP addresses are changing or moving,
>> it's common to do a "gratuitious ARP" so that ARP tables are refreshed
>> with the new data.
>
> Does anybody know if LWIP does this by itself after netif_set_addr() is
> called?

I don't think so.
The only occurences of gratuitous ARP are in netif_set_up(.) and
netif_set_link_up(.).

I think that the preferred way of changing any interface setting would
be to bring the interface down via netif_set_down(.), apply the
changes and then bring the interface up again via netif_set_up(.),
which would imply the transmisson of a gratuitous ARP.

Kind regards
Jens