Randy Bush <randy@psg.com> writes:
I believe we've seen bogus low AS number announcements a few times before, and they've usually been caused by attemts to configure AS path prepending without understanding and/or reading the docs.
Someone might have wrongly assumed that
set as-path prepend 133711 133711
could be written shorter like
set as-path prepend 133711 2
and there you go...
for someone else's prefix?
No, of course not. At least I have no reason to beliece so. I briefly looked at a couple of the examples Anurag posted. And for those, the next AS number in the path seemed consistent with the prefix owner: * 43.227.224.0/24 208.51.134.254 0 0 3549 3356 6453 4755 133711 133711 133711 2 i * 91.143.144.0/20 208.51.134.254 0 0 3549 3356 12389 41837 41837 2 i bjorn@miraculix:~$ whois 43.227.224.0/24 |grep origin origin: AS133711 origin: AS58965 bjorn@miraculix:~$ whois 91.143.144.0/20 |grep origin origin: AS41837 Bjørn