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[rpd] Reserved Space/Available Space and potential hijacking

Owen DeLong owen at delong.com
Thu Oct 16 19:26:04 UTC 2025


>> 
>> As you pointed out, there are plenty of legitimate cases for this. For example, some ISPs will issue space to multi-homed customers who will then originate more specifics assigned to them from their own ASN while the covering aggregate would be announced by the ISP, but not the more specifics. 
> I'd like to get an idea of prevalent this really is.
> 

To what end?

It’s just one example of legitimate reasons that prefixes may be originated by ASNs that don’t belong to the resource holder.

Owen

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