nanog mailing list archives
Re: well-known Anycast prefixes
From: Frank Habicht <geier () geier ne tz>
Date: Thu, 21 Mar 2019 18:59:18 +0300
Hi James, On 20/03/2019 21:05, James Shank wrote:
I'm not clear on the use cases, though. What are the imagined use cases? It might make sense to solve 'a method to request hot potato routing' as a separate problem. (Along the lines of Damian's point.)
my personal reason/motivation is this: Years ago I noticed that my traffic to the "I" DNS root server was traversing 4 continents. That's from Tanzania, East Africa. Not having a local instance (back then), we naturally sent the traffic to an upstream. That upstream happens to be in that club of those who don't have transit providers (which probably doesn't really matter, but means a "global" network). My Theory : So just because one I-root instance was hosted at a customer (or customer's customer), that got higher local-pref and now packets take the long way from Africa via Europe, NorthAmerica to Asia and that customer in Thailand. While closer I-root instances would obviously be along the way, just not from a paying customer, "only" from peering. I don't know whether or not to blame that "carrier" for intentionally(?) carrying the traffic that far - presumably the $ they got for that from the I-root host in Thailand was worth it, and not enough customers complained enough about the latency? But I think it would be worthwhile to give them an option and produce a mechanism of knowing what's anycasted. Maybe (thinking of it) a solution for really well-known prefixes available at many instances/locations (like DNS root) would be to have their fixed set of direct transits at all the "global" nodes and everywhere else to tell peers to not advertise this to upstreams. Greetings, Frank
Current thread:
- Re: well-known Anycast prefixes, (continued)
- Re: well-known Anycast prefixes Joe Provo (Mar 19)
- RE: well-known Anycast prefixes David Guo via NANOG (Mar 19)
- Re: well-known Anycast prefixes Hansen, Christoffer (Mar 19)
- Re: well-known Anycast prefixes Grzegorz Janoszka (Mar 19)
- Re: well-known Anycast prefixes Bill Woodcock (Mar 19)
- Re: well-known Anycast prefixes Bill Woodcock (Mar 19)
- Re: well-known Anycast prefixes Frank Habicht (Mar 19)
- Re: well-known Anycast prefixes Bill Woodcock (Mar 19)
- Re: well-known Anycast prefixes Frank Habicht (Mar 19)
- Re: well-known Anycast prefixes James Shank (Mar 21)
- Re: well-known Anycast prefixes Frank Habicht (Mar 21)
- Re: well-known Anycast prefixes Job Snijders (Mar 21)
- Re: well-known Anycast prefixes Bryan Holloway (Mar 21)
- Re: well-known Anycast prefixes Ross Tajvar (Mar 21)
- Re: well-known Anycast prefixes Bryan Holloway (Mar 21)
- Re: well-known Anycast prefixes Bill Woodcock (Mar 21)
- Re: well-known Anycast prefixes Grzegorz Janoszka (Mar 19)