Re: RPKI for dummies

[Dovid Bender <dovid () telecurve com>]

Fabien,

Thanks. So to sum it up there is nothing stopping a bad actor from
impersonating me as if I am BGP'ing with them. It's to stop any other AS
other then mine from advertising my IP space. Is that correct? How is
verification done? They connect to the RIR and verify that there is  a cert
signed by the RIR for my range?



On Thu, Aug 20, 2020 at 9:51 AM Fabien VINCENT (NaNOG) via NANOG <
nanog () nanog org> wrote:

> Hi,
>
> In fact, RPKI does nothing about AS Path checks if it's your question.
> RPKI is based on ROA where signatures are published to guarantee you're the
> owner of a specific prefix with optionnal different maxLength from your
> ASN.
>
> So if the question is about if RPKI is sufficient to secure the whole BGP
> path, well, it's not. RPKI guarantee / permit only to verify the ressource
> announcements (IPvX block) is really owned by your ASN. But even if it's
> not sufficient, we need to deploy it to start securing resources', not the
> whole path.
>
> Don't know if it replies to your question, but you can read also the
> pretty good documentation on RPKI here :
> https://rpki.readthedocs.io/en/latest/rpki/introduction.html or the
> corresponding RFC ;)
>
> Le 20-08-2020 15:20, Dovid Bender a écrit :
>
> Hi,
>
> I am sorry for the n00b question. Can someone help point me in the right
> direction to understand how RPKI works? I understand that from my side that
> I create a key, submit the public portion to ARIN and then send a signed
> request to ARIN asking them to publish it. How do ISP's that receive my
> advertisement (either directly from me, meaning my upstreams or my
> upstreams upstream) verify against the cert that the advertisement is
> coming from me? If say we have
> Medium ISP (AS1000) -> Large ISP (AS200)
> in the above case AS200 know it's peering with AS1000 so it will take all
> advertisements. What's stopping AS1000 from adding a router to their
> network to impersonate me,  make it look like I am peering with them and
> then they re-advertise the path to Large ISP?
>
> Again sorry for the n00b question, I am trying to make sense of how it
> works.
>
> TIA.
>
> Dovid
>
>
> --
> *Fabien VINCENT*
> *@beufanet*