Re: [lwip-users] Being notified of an address conflict when setting address manually

[Simon Goldschmidt]

Mason <address@hidden> wrote:
> > the fastest way for you would probably 
> > be to just intercept ARP responses where they are passed to DHCP and 
> > handle them yourself.
> 
> If I write a detection routine, it can't be in dhcp.c, because that
> file might not even be compiled (LWIP_DCHP == 0).
> 
> I think the detection routine has to be in etharp.c, in the handling
> of ARP_REPLY packets. Do you disagree?

That's what I said: "where they are passed to DHCP", not "in dhcp.c" (i.e. add 
a call to your own function in etharp_arp_input() just after/before the call to 
dhcp_arp_reply() - in this function, check if the ARP response handles your IP 
address and react appropriately).

I'd be happy if you could even provide a patch that does this check and calls 
an external function (e.g. etharp_address_collision(netif)) if such a packet 
has been received. We could then easily integrate that into the stack.

Simon
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