> >It strikes me that a round-robin DNS might serve you well here. To my >knowledge, round-robin DNS won't handle "if A fails then try B" -- it will >cycle through all 'X' datacenters/sites, distributing the connections >amoung them. In this scenario, if a particular site is not available, the >user would have to try again later and most likely (with a short TTL) get >sent to another site. > >Are there round-robin DNS implementations that perform "aliveness" tests >and drops unavailable sites out of the round-robin? > Well, the most famous would be lbnamed published in LISA IX >From http://www.usenix.org/ Summary: lbnamed: A Load Balancing Name Server in Perl. This paper discusses an attempt to solve that problem using a load balancing name server. This name server also has the ability to serve other dynamic information as well, such as /etc/passwd information (a la Hesiod [2]). -- ____________________________________________________________________________ Doug Hughes Engineering Network Services System/Net Admin Auburn University dougat_private
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