nanog mailing list archives
Re: Looking for geo-directional DNS service
From: Joe Greco <jgreco () ns sol net>
Date: Tue, 15 Jan 2008 14:03:16 -0600 (CST)
Except Hank is asking for true topological distance (latency / throughput / packetloss). Anycast gives you BGP distance, not topological distance. Say I'm in Ashburn and peer directly with someone in Korea where he has a node (1 AS hop), but I get to his node in Ashburn through my transit provider (2 AS hops), guess which node anycast will pick?
Ashburn and other major network meet points are oddities in a very complex network. It would be fair to note that anycast is likely to be reasonably effective if deployed in a manner that was mindful of the overall Internet architecture, and made allowances for such things. Anycast by itself probably isn't entirely desirable in any case, and could ideally be paired up with other technologies to "fix" problems like this. I haven't seen many easy ways to roll-your-own geo-DNS service. The ones I've done in the past simply built in knowledge of the networks in question, and where such information wasn't available, took "best guess" and then may have done a little research after the fact for future queries. This isn't as comprehensive as doing actual latency / throughput / pl checking. ... JG -- Joe Greco - sol.net Network Services - Milwaukee, WI - http://www.sol.net "We call it the 'one bite at the apple' rule. Give me one chance [and] then I won't contact you again." - Direct Marketing Ass'n position on e-mail spam(CNN) With 24 million small businesses in the US alone, that's way too many apples.
Current thread:
- Looking for geo-directional DNS service Hank Nussbacher (Jan 15)
- Message not available
- Re: Looking for geo-directional DNS service Hank Nussbacher (Jan 15)
- Message not available
- RE: Looking for geo-directional DNS service Hank Nussbacher (Jan 15)
- Re: Looking for geo-directional DNS service Hank Nussbacher (Jan 15)
- Message not available
- Re: Looking for geo-directional DNS service Bill Woodcock (Jan 15)
- Re: Looking for geo-directional DNS service Patrick W. Gilmore (Jan 15)
- Re: Looking for geo-directional DNS service Joe Greco (Jan 15)
- Re: Looking for geo-directional DNS service Patrick W.Gilmore (Jan 15)
- Re: Looking for geo-directional DNS service Paul Vixie (Jan 15)
- Re: Looking for geo-directional DNS service Joe Greco (Jan 15)
- Re: Looking for geo-directional DNS service Paul Vixie (Jan 16)
- Re: Looking for geo-directional DNS service Joe Greco (Jan 16)
- Re: Looking for geo-directional DNS service Patrick W. Gilmore (Jan 15)
- Re: Looking for geo-directional DNS service Steve Gibbard (Jan 16)
- Re: Looking for geo-directional DNS service Joe Abley (Jan 15)