Re: Replacing PSTN with VoIP wise? Was Re: Phone networks struggle in Hurricane Katrina's wake

[Petri Helenius <pete () he iki fi>]

Michael.Dillon () btradianz com wrote:

> A similar problem would be created if a web server relied
> on DNS that was only hosted on servers in New Orleans.
>  

Do you (or somebody) know of recent numbers of what percentage of 
domains have all their DNS servers in;
a) same subnet
b) same AS
c) same geographical "zone" (faultline, floodplain, coastline, etc.)

Obviously if everything served by the DNS is co-located in the same 
failed facility, it does not matter that much if the names resolve to IP 
addresses which are unreachable anyway.

Pete