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No, that's not correct - you can see here that the route is being advertised through no less than 11 intermediate ISPs (and there will be more, that's just from
by russss 17y ago
No, that's not correct - you can see here that the route is being advertised through no less than 11 intermediate ISPs (and there will be more, that's just from one perspective on the internet):
http://www.ris.ripe.net/cgi-bin/lg/index.cgi?rrc=RRC001&query=1&arg=8.8.8.0%2F24 http://www.ris.ripe.net/cgi-bin/lg/index.cgi?rrc=RRC001&...
They're advertising 8.8.8.0/24, while Level3's route is 8.0.0.0/8 - the more specific route wins.
Google is effectively a tier 1 ISP now, so buying transit off Level3 for those blocks would be a lot more costly than routing them themselves.
- jganetsk 17y agoWhat do you mean that Google is a tier 1 ISP? Do they provide transit to anyone? Interestingly, if you can advertise a sub-block and override the bigger block's advertisement, what's stopping people from just stealing sub-blocks from ISPs?
- blasdel 17y ago> what's stopping people from just stealing sub-blocks from ISPs? The thief has to either be upstream of your connection, or peered at an extremely high level with others trusting their BGP advertisements. There was a hilarious incident not that long ago where the Pakistanis accidentally blackholed YouTube's IP-block globally (instead of just within the country).