[ixpmanager] Filtered because Transit Free ASN

[Jonathan Stewart]

Hi Salvador,

The suggestion is that a tier-1 (transit free ASN) originates this route,
let's call them ISP A.

You're seeing this route via ISP B, suggesting that ISP B is providing
transit to ISP A.

Since ISP A is a tier-1, it would not purchase transit from any other ASN
to reach your IX.

This is therefore a safety check--if you see a Tier-1 route coming from an
intermediate ISP, something funny is happening (possible route hijack, more
likely unintentional misconfiguration) and you should not accept that route.

Hope my understanding is right and I'm not spreading misinformation. ;-)

Jonathan



On Tue, 29 Jun 2021 at 13:31, Salvador Bertenbreiter <salvador at pitperu.net>
wrote:

> Hi guys,
> I hope you're doing well and having good health. Recently we have added a
> Carrier into our IX and it looks like some prefixes advertisement by them
> are being rejected by the Route Server. I'm curious why it's a bad idea to
> allow those prefixes?
>
> [image: image.png]
>
> Best regards,
>
> Salvador
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> ixpmanager at inex.ie
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-- 
     Jonathan
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