We generally tell people either use DNS load balancing or put a Software or
HW load balancing


   1. DNS load balancing is low
   2. S/W load balancing does not scale up (new some other load balancer in
   front)
   3. HW load balancing is expensive


Seem there is 4th choice, that is use TCP IP routing. Basically, you can
setup router to forward requests to multiple nodes when it see packets to
specific IP.

Above can mess up sessions, so this is used with hash based routing to get
router to send all packets from same source IP to one machine.

I could not find a good description about this, but this linkedin tech talk
discuss it for few minutes http://www.youtube.com/watch?v=2WuT2rdLK5A

-- 
============================
Srinath Perera, Ph.D.
  Director, Research, WSO2 Inc.
  Visiting Faculty, University of Moratuwa
  Member, Apache Software Foundation
  Research Scientist, Lanka Software Foundation
  Blog: http://srinathsview.blogspot.com/
  Photos: http://www.flickr.com/photos/hemapani/
   Phone: 0772360902
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