Re: BCP38 For BGP Customers

[William Herrin <bill () herrin us>]

On Tue, Nov 8, 2022 at 12:29 PM Mike Hammett <nanog () ics-il net> wrote:
> > "Reverse path filtering literally says don't accept a packet from
> > somewhere that isn't currently the next hop for that packet's source
> > address."
>
> FIB or RIB?
>
> I knew of uRPF as available over an interface, per the routing table, not best path available. Or is that 
> implementation dependent?

FIB. The RIB is never consulted on a per-packet basis. It's not built
to be fast enough to consult on a per-packet basis.

Regards,
Bill Herrin



-- 
For hire. https://bill.herrin.us/resume/