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

Brad Knowles brad at stop.mail-abuse.org
Fri Jul 14 10:30:05 UTC 2006

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 

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/>.

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