geo-targeted dns

[Jason Morehouse]

Thanks everyone for the info.  I'll look further into anycast.

On Fri, 2005-08-05 at 15:36 -0500, Tim Peiffer wrote:
> Jason - Your scheme sounds like you are looking for ways to vary IP 
> response to name requests. Correct me if I misunderstand the the 
> problem.  Most of the controls you need are part of the DNS server, not 
> the client and not under your control.
> 
> Can I suggest that you research IP anycast - RFC 1545 and 2101..  Use 
> exactly the same public IP address and have the routing table (closest 
> hop count wins) decide the best path to your public IP address.  The 
> root nameservers have been doing this for years to deliver 'N' servers 
> in 'N' countries all with the same name and address.
> 
> Reference:
> http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A//www.net.cmu.edu/pres/anycast/&ei=qsjzQuGEL6j2RdXCqKoC
> http://www.google.com/url?sa=t&ct=res&cd=4&url=http%3A//nms.lcs.mit.edu/%7Edina/pub/Katabi-350.pdf&ei=qsjzQuGEL6j2RdXCqKoC
> http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A//www.zurich.ibm.com/%7Erha/papers/anycast-gi98.pdf&ei=WcjzQqVSyNZFtdullgI
> 
> Geo-targeted services instead of using DNS to band-aid the problem:
> Alternatively, you might be best served using a content switch; use your 
> first webserver to redirect to a more local web server for local 
> content.  You could use the query source coming from your web logs, 
> dereference the page query source to a given country and then format a 
> reference to desired content.  Tables are available from each of the 
> routing registries..
> 
> Examples from ARIN delegations for August 2005.
> ftp://ftp.arin.net/pub/stats/arin/delegated-arin-20050805
> 
> [...]
> arin|US|ipv4|3.0.0.0|16777216|19880223|assigned
> arin|US|ipv4|4.0.0.0|16777216|00000000|allocated
> arin|US|ipv4|6.0.0.0|16777216|00000000|allocated
> arin|US|ipv4|7.0.0.0|16777216|19971124|allocated
> arin|US|ipv4|8.0.0.0|16777216|00000000|allocated
> arin|US|ipv4|9.0.0.0|16777216|19881216|assigned
> [...]
> 
> 
>   
> 
> Current data from all the registries:
> ftp://ftp.apnic.net/pub/apnic/stats/apnic/delegated-apnic-latest
> ftp://ftp.arin.net/pub/stats/arin/delegated-arin-latest
> ftp://ftp.lacnic.net/pub/stats/lacnic/delegated-lacnic-latest
> ftp://ftp.ripe.net/ripe/stats/delegated-ripencc-latest
> 
> Tim Peiffer
> University of Minnesota
> Networking and Telecommunications Services.
> 
> 
>