To:
Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>
cc:
Mark_Andrews@isc.org, hobbes@engin.umich.edu, dnsop@cafax.se
From:
marka@isc.org
Date:
Thu, 08 Jul 1999 12:28:52 +1000
In-reply-to:
Your message of "Thu, 08 Jul 1999 10:51:44 +0200." <199907080152.KAA13787@necom830.hpcl.titech.ac.jp>
Sender:
owner-dnsop@cafax.se
Subject:
Re: Topological Motivation for draft-ohta-root-servers-01.txt?
> Mark; > > > I suspect that it would be better to say that the servers > > need to be distributed so that there is, in general, not > > the need to make inter-continental, trans-oceanic or > > satellite hops. All of these types of links introduce > > large delays. > > I have never heard such reasoning to have multiple (root) > servers. > > If you insist, it can be added, but: > > > Does < 100ms sound > > like a good figure? > > are you saying that there should not be new root servers if the > TTLs to existing ones is < 100ms? > > Note that it is not my business to fake a false or weakened reasoning > to have a lot of root servers. > > Masataka Ohta > I want root servers that are reachable in a timely manner. I don't want all the root servers to become unreachable due to single point of failure. For TCP streams it does not matter so much where the servers are as TCP is *not* a stop and go protocol. DNS/UDP is however and the RTT is a big consideration in sighting root (and TLD) servers. If the server is just over the border the is not necessarilly a good technical reason to have a root server in this country. If the root server is a long way away topologically / RTT wise there is. If there is a root server in France I can see no good technical need to have one in Monaco. Similarly Singapore w.r.t. Thialand. We should be defining the siting of servers on technical grounds not politcal ones. If the are politcal reasons are strong enough they will influence the underlying technolgical interconnects enough that the technical solution will match the desired political one. Mark -- Mark Andrews, Internet Software Consortium 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka@isc.org