On Thu, May 04, 2006 at 10:18:45PM +0200, Hubert Feyrer wrote:
> On Thu, 4 May 2006, Steven M. Bellovin wrote:
> >No, I don't like it, either, which is why I conclude that this isn't a
> >fruitful path to pursue.  Your goal is very reasonable, but I don't think
> >you can do it the way you've suggested.
> 
> I had an idea on the whole "setup my wlan laptop as router" scenario:
> 
> Initially, you have no address at all.
> Then, you ask for one ip address (via DHCP, autoconfiguration, whatever)
> That's the standard 'laptop' case so far.
> 
> When you want your 'laptop' to become a router all of a sudden, you 
> basically need more address space. I wonder why not just ask for it, as 
> you do in the first case (DHCP, ...), and then advertize it on the 
> "internal" network/interface, and just route it.
> 
> I'm not sure DHCP or anything on this planet is prepared for the second 
> inquiry, but it would prevent the need for ad-hoc addresses and 
> NAT.
> 

Seems like RSIP (RFC 3102-3105) could work well here.

- Brian