[U-Boot-Users] Duplicate IP address check

[Ben Warren]

gvb.uboot wrote:
> Ben Warren wrote:
>> Hi Dan,
>>
>> Dan Batryn wrote:
>>> Due to a mis-configuration of our DHCP server there was an
>>> overlapping range of DHCP assigned IP address and units configured
>>> to have IP addresses statically assigned. I was surprised to find
>>> that UBOOT did not complain of a duplicate IP address while trying
>>> to boot via the network. Looking through the source I cannot see
>>> any code to perform the typical ARP for yourself check that I have
>>> seen before. Could someone please tell me if I have overlooked
>>> something or is this feature missing?
>>>
>> There is no explicit check for duplicate IP assignment. U-boot's 
>> networking code is intentionally minimalist and thus lacks many such 
>> features. Feel free to provide a patch and a convincing argument of 
>> why it's needed.
>>
>> regards,
>> Ben
>
> Ditto on the patch.
>
> WRT the convincing argument, I think the bar would be *really* low on 
> this one. :-) I would consider a convincing argument to be "The nearly 
> universal convention of performing an ARP to verify that the 
> DHCP-assigned IP address is unused is missing."
Sure, this is a no-brainer. But, it shouldn't be limited to DHCP since 
having a dynamic address trouncing a static one is only one trouble 
scenario. Who knows, there may be people out there who object to the 
extra milliseconds that this ARP will add to boot time (not me).

regards,
Ben