root server access statistics

[Mark_Andrews at isc.org]

> I wanted to share what I have been found. My DNS is
> located in Herndon, VA. This stats were collected in
> 12 day period. The following is the distribution of
> queries to the root servers from my server. 
> 
> Almost 30% of the time my DNS went to the west coast
> although there are 5 root servers on the east coast of
> US which are at most 20 miles away from me. In
> addition, my DNS consulted to servers in Sweden, UK
> and Japan, too. I thought it was interesting!
> 
> Thanks Mark Andrews and Mike Voight for educating me
> on how BIND is choosing the root servers. I still
> think there can be improvements in BIND to choose
> closer root servers.    

	named chooses the "fastest" servers.  If the fastest server
	is on the other side of the world it will use it.  Named
	sorts the response times into bands 128 ms wide. My bet would
	be that 'a', 'd' and 'f' are falling into the first band and
	that 'b', 'c' and 'h' the second.  You should be able to verify
	this with dig as it reports response time.

	Rtt Bands (ms): 0-63, 64-192, 193-320, 323-448 

	Mark
> 
>      258 a.root Herndon, VA
>      164 b.root Marina delRey, CA
>      198 c.root Herndon, VA
>      229 d.root College Park, MD
>       78 e.root Moffet Field, CA
>      207 f.root Woodside, CA
>       34 g.root Chantilly, VA
>      154 h.root Aberdeen, MD
>       85 i.root Stockholm, Sweden
>       89 j.root Herndon, VA
>        6 k.root London, UK
>        3 l.root Marina delRey, CA
>        9 m.root Keio, Japan
> 
>     1514 total
> 
> 
> ===
> -----------------------
> SEZEN UYSAL
> Senior Network Consultant
> Open Systems Consulting
> suysal at yahoo.com
> -----------------------
> _________________________________________________________
> Do You Yahoo!?
> Get your free @yahoo.com address at http://mail.yahoo.com
> 
> 
> 
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org