[dns-operations] Too Open (Was: OpenDNS makes your Internet work better

[Brad Knowles]

At 1:34 AM -0400 2006-07-14, John Payne wrote:

>  I don't pretend to read minds.  However, unicast does not restrict
>  the number of machines behind a single IP either.

At the level of an individual site, no -- you can put as many 
machines as you want behind those L4 load-balancing switches, well at 
least up to the number that your switches can support.  And you can 
have a large number of L4 load-balancing switches that all serve the 
same service IP address, using internal routing tricks with OSPF and 
ARP.

But without anycast, my understanding is that there is no way to 
share a given service IP address across multiple separate and 
distinct sites, each with their own upstream service providers or 
routing partners, etc....

-- 
Brad Knowles, <brad at stop.mail-abuse.org>

"Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety."

     -- Benjamin Franklin (1706-1790), reply of the Pennsylvania
     Assembly to the Governor, November 11, 1755

  Founding Individual Sponsor of LOPSA.  See <http://www.lopsa.org/>.