Re: BCP38 For BGP Customers

[Tom Beecher <beecher () beecher cc>]

> Are you taking the stance of "if you don't send us the prefix, then
> we don't accept the traffic"?

If you were one of my upstreams, and you implemented that, you would very
quickly no longer be one of my upstreams.



On Mon, Nov 7, 2022 at 2:22 PM Charles Rumford via NANOG <nanog () nanog org>
wrote:

> Hello -
>
> I'm are currently working on getting BCP38 filtering in place for our BGP
> customers. My current plan is to use the Juniper uRPF feature to filter
> out
> spoofed traffic based on the routing table. The mentality would be: "If
> you
> don't send us the prefix, then we don't accept the traffic". This has
> raised
> some issues amongst our network engineers regarding multi-homed customers.
>
> One of the issues raised was if a multi-homed BGP customer revoked a
> prefix from
> one of their peerings, but continued sending us traffic on the link then
> we
> would drop the traffic.
>
> I would like to hear what others are doing for BCP38 deployments for BGP
> customers. Are you taking the stance of "if you don't send us the prefix,
> then
> we don't accept the traffic"? Are you putting in some kind of fall back
> filter
> in based on something like IRR data?
>
> Thanks!
>
> --
> Charles Rumford (he/his/him)
> Network Engineer | Deft
> 1-312-268-9342 | charlesr () deft com
> deft.com