On Tue, 13 Nov 2001, Bernd Walter wrote:

> > This requires some additional kernel configuration, I think, to allow you
> > to tell the kernel that links A,B are in one site and C is in another.
> 
> That way you are left with a manual configuration.
> Not very differend to static address translation.

yes (although you wouldn't need to do any translation  if you weren't
routing between sites).
I'm not aware of any nice protocol that anyone has come up with to allow
autoconfiguration of which interfaces belong to which sites


> OK - now I asume I understand your problem.
> But think of site local addresses as beeing private addresses.
> If the University of California would allow you to be connected to both
> the University network and the IBM network - why would they use private
> addresses.

Site local addresses can be used in more situations than the present IPv4
192.168.x.x style private addresses. I can use site local addresses in
parallel with global addresses so that, for example, I can always use the
same IP address to get to a local system, even if the global addresses
have been renumbered.

> That's more a situation you have when companies with their own private
> addresses merge and then need to connect their private networks.

I don't want connectivity betweeen the networks - I don't want any
arbitrary system at the University of California to be able to address an
arbitrary system at IBM (again, this is what global addresses are for). 

I want *my PC* to be able to address any site-local address on the UCLA
network and also to address any site-local address on the IBM network.


> Whenever you use site local addresses you don't need to connect other
> networks.

I disagree with this - there are uses for site-local addresses even when
global addresses have been assigned.

For example, exchange points, where it is not appropriate for the exchange
networks to be numbered out of any of the providers networks.
or 
Maybe I want to connect to a system on my network, even though the global
prefixes are changing.

I agree that if site-local addresses are being used in the equivalent
role as IPv4 private addresses, what you are saying makes sense. But I am
arguing that they are not the same.

-- 
Ben Clifford   http://www.hawaga.org.uk/ben/
Telephone: United States 310 443-4485    United Kingdom 0709-227-5268



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