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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