nanog mailing list archives
Re: well-known Anycast prefixes
From: Ross Tajvar <ross () tajvar io>
Date: Thu, 21 Mar 2019 12:52:27 -0400
Not all any-casted prefixes are DNS resolvers and not all DNS resolvers are anycasted. It sounds like you would be better served by a list of well-known DNS resolvers. On Thu, Mar 21, 2019 at 12:35 PM Bryan Holloway <bryan () shout net> wrote:
On 3/21/19 10:59 AM, Frank Habicht wrote:Hi James, On 20/03/2019 21:05, James Shank wrote:I'm not clear on the use cases, though. What are the imagined usecases?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)./snipGreetings, FrankI can think of another ... We rate-limit DNS from unknown quantities for reasons that should be obvious. We white-list traffic from known trusted (anycast) ones to prevent a DDoS attack from throttling legitimate queries. This would be a useful way to help auto-generate those ACLs.
Current thread:
- Re: well-known Anycast prefixes, (continued)
- 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)