Re: Cox AS22773 uPRF issue - please contact off list

[Frank Habicht via NANOG <nanog () lists nanog org>]

Hi.

if you're a customer, using only my PA space, and multihomed:
I'll do BGP with you -- you can be AS64512.
I'll do strict uRPF with a fail-filter allowing all my PA space sourced 
by you.

Is there a problem with that?

Frank


On 12/4/2025 7:23 AM, C. Jon Larsen via NANOG wrote:
> strict urpf should only ever be enabled by providers when PA space is 
> assigned, and typically thats on a static routed assignment, never a bgp 
> session and typically never on a bgp session / peer with a customer that 
> is multihomed, etc.
>
> In other words I would tend to say Im not going to ever buy transit from 
> you if you run strict uRPF on my ports.
>
>
>
> + Jon Larsen: CTO Richweb, Inc.
> + Richweb.com: Cloud/Route/Switch/MSP Experts since 1995
> + GnuPG Public Key: http://jlarsen.richweb.com/jlarsen.gpg
> + Business: (804) 368-0421 x 101; Mobile: (804) 747-8592
>
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