Pekka Savola writes:
> On Mon, 7 Jan 2002, Pekka Nikander wrote:
> > Michael Thomas wrote:
> Moreover, ingress filtering is usually performed at more than one router.
>
> The network manager of the LAN might perform it. The network manager of
> the site should perform it. The network manager of the ISP should also
> perform it. Etc.
>
> Therefore, this "notification" or "ingress filtering registration" would
> have to operate a bit like path MTU discovery or a router alert option.
> Also, this would get more difficult in the case of multiple, changing
> paths (multihoming).
>
> Certainly an interesting idea, though.
This entire question is being begged by
multihoming which RPF checks fail at pretty
miserably. And of course, asymmetric routes. We
need something better. Essentially, I think what
I'm proposing is something in lieu of RPF
checks. The open question is whether we can make
this pervasive too. If we can, we can safely turn
off RPF checks.
Mike
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