Stephen, thnx .. I think query source refer to DNS server right? not necessary actally host that requesting qurey? Suppose if a ISP does not have fully messed DNS server then result may not be optimum? --------------------------------------------------- Tatsuya Kawasaki - Engineer III - CSC tatsuya.kawasaki@allegiancetelecom.com - 240-616-2417 800-581-8711 (24 Hour Support) - 240-616-2414 (fax) Allegiance Internet On Wed, 11 Dec 2002, Stephen Sprunk wrote:
Date: Wed, 11 Dec 2002 10:21:45 -0600 From: Stephen Sprunk <ssprunk@cisco.com> To: Tatsuya Kawasaki <tatsuya@kivex.com>, nanog ml <nanog@merit.edu> Subject: Re: lists of DNS servers by region.
Tatsuya Kawasaki wrote:
Many web sites which are mulihome/mult co-located seem to act differnetly depend on which DNS severs that we use.
Questions: 1. Does anyone have lists of DNS servers by region to may optimize the path?-- of course it may depend on the network topology ...Assume that If ISP is fully messed with others.. ie Teir I provider for exmaple.
2. what is the typical of method they(web hosts) used to decide which one to give?
Many DNS "load balancing" solutions will return the address of the web server closest to the _query source_. This means these systems work best when your recursive DNS servers are topologically closest to your users.
S