Re: [dnsext] Re: I-D ACTION:draft-vandergaast-edns-client-ip-00.txt

[Martin Barry <[e-mail]>]

Just a small comment on "dns-tricks" versus "routing-tricks".

$quoted_author = "Paul Vixie" ;
> 
> because i like caching, and because i don't think the dns q-tuple should be
> expanded to include more elements.  because dns is a phat target for folks
> whose business models require cost-shifting from their edge to our middle.
> oh hell, i said all this in the acm queue article:
> 
> http://queue.acm.org/detail.cfm?id=1647302

"Anycast TCP is also in use by a few CDNs and works at least as well as any
DNS-layer solution. Anycast is stable for minutes or hours at a time, so
it's rare for two TCP packets to the same destination to reach different
anycast contributors."

Anycast usually implies a /24 used for a single service or group of
services. This limits "routing-tricks" to those that have a spare /24, speak
BGP in multiple locations and can justify polluting the global routing table
with another /24.

Conversely "dns-tricks" can be, and are, used by those who don't meet the
above criteria. The only limitations are having authorative servers capable
of applying the "tricks".

Both imply some burden shifting in order to provide "better" service to the
end user.

cheers
Marty