nanog mailing list archives
Re: well-known Anycast prefixes
From: Bryan Holloway <bryan () shout net>
Date: Thu, 21 Mar 2019 12:39:01 -0500
On 3/21/19 11:52 AM, Ross Tajvar wrote:
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.
True on both counts, and that's why I said "help".
On Thu, Mar 21, 2019 at 12:35 PM Bryan Holloway <bryan () shout net <mailto: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 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). /snip > Greetings, > Frank > I 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 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)