DMARC ViolationAS21299 - ASN prepending 255 times

Joe Maimon jmaimon at
Thu Mar 31 22:13:27 UTC 2022

Joe Provo wrote:
> On Fri, Mar 25, 2022 at 11:08:01AM +0300, Paschal Masha wrote:
>> :) probably the longest prepend in the world.
>> A thought though, is it breaking any standard or best practice procedures?
> That said, prepending pretty much anything more than your current view
> of the Internet's diameter in ASNs is useless in practice. Cascading
> effects are considered in
> where a decent low number (5) is propsed.
> Chers,
> Joe

So is there a good way to signal along with a BGP route that the 
originator of the route wants you to know that this route has very high 
suckage factor and even if you normally prefer your peers customers 
whatever, you should perhaps think twice about that for this route, 
cause its really last resort.

Because as-path is an overloaded multimeaning traffic influencing hammer 
that has imprecise and frequently undesirable results. And if that were 
not the case, than discussions of its relative size compared to internet 
diameter would be much more relevant.


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