BCP38 For BGP Customers

William Herrin bill at herrin.us
Tue Nov 8 20:53:46 UTC 2022


On Tue, Nov 8, 2022 at 12:29 PM Mike Hammett <nanog at 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/


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