load-balancing in DNS using two A records

Martin T m4rtntns at gmail.com
Tue Dec 20 17:37:56 UTC 2011

I have seen setups where one domain name has two address records.
First IP address is in the ISP-A network and the other one is in the
ISP-B network. In case I execute "host www.<domainname>.com", I always
get two IP addresses as a reply and they always appear by turns. Am I
correct, that setup like this provides redundancy as well as
load-balancing? Is there some common method in BIND to give out IP
addresses by turns? Last but not least, how do application layer(for
example www, ssh) handle such setup?


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