[ECOS] Temporary IP address assignment trick

[Jonathan Larmour]

Grant Edwards wrote:

>>When the stack starts up "properly" it always does an ARP
>>request for itself anyway, one of the reasons being to check
>>there aren't conflicts with people with the same IP. It
>>certainly means that you can't just bring the stack up
>>completely unless you already have its IP address sorted out,
>>so you can't let it work "transparently".
> 
> 
> So there's no way to open a raw socket if the stack doesn't
> have an IP address?

I can't see a way for a _raw_ socket to do that no... I don't even see raw 
sockets at all in this stack. I hope I'm wrong.

The thing that I mean about the "not working transparently" thing is that 
once you eat that packet, it's gone, so it's not transparent - that's 
possible but would probably be difficult and invasive.

If you don't mind the packet being lost (e.g. wait for TCP SYN retry) 
then, with some changes in net/common you should be able to do something 
very similar to what BOOTP does now in do_bootp(), but just without 
sending a request out first.

Jifl
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