Both Bill and Darrel used to argue against my concept of geo-location
rather than prefix-based routing by stressing the "internet economics".
In compliance with the distance-vector paradigm, internet
economics/policies like "who is allowed to use my ISP network" are soustained
implicitly:
it is up to whether or not a particular prefix is communicated to the
respective next-ISP. Admitted, my non-DV-based concept does not provide this
implicitly.
However, and see the email-excerpt below from the LISP-ml: LISP cannot
provide it either !!!
Heiner
--- Begin Message ---
Hello Luigi,
Luigi Iannone wrote:
> Hi Noel,
>
> On Jan 7, 2010, at 17:24 , Noel Chiappa wrote:
>
> [snip]
>
>
>> As to LISP, ITRs could refuse to forward traffic from sources they are not
>> supposed to handle, but the problem is 'how do they know what sources they
>> are supposed to be handling'?
>>
>
> Can't they just check the lisp database?
>
>
>> If they are also an ETR, they know,
>>
>
> Isn't the contrary? Current spec do not mandate a mapping for the source
> address of a packet in the ETR (unless it is also an ITR and there is
> bidirectional traffic).
>
> If the ETR has a mapping for the source address in its cache, then it do some
> sanity checks and eventually drop the packet.
>
> .. or am I wrong somewhere?
>
>
>
I might be the one confused but isn't Noel speaking here about some sort
of uRPF? Meaning the ITR should not forward packets from within its
domain if the source EID of the packet is not from the domains
EID-prefix. But the boxes that are simple ITRs don't know the domain's
EID-prefix, only the ETRs know it (they use it in registrations at
Map-Servers).
.. or maybe I'm wrong :)
Florin
> Luigi
>
>
>> but the
>> design does allow of exit-only (i.e. ITR-only) boxes; handling those would
>> mean more configuration (bad).
>>
>> Noel
>> _______________________________________________
>> lisp mailing list
>> l...@ietf.org
>> https://www.ietf.org/mailman/listinfo/lisp
>>
>
>
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