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There is a bug report and patches at
https://sourceware.org/bugzilla/show_bug.cgi?id=15862
[nscd doesn't cache record containing more than one IP address.]

  Not specific to rhel6, as the patches are not in any upstream
version, is there some plan to implement the patches in sourceware
bugzilla?

Created attachment 1424114 [details]
glibc-2.12-sfdc02079051.patch

  It was explained that some software was doing gethostbyname on a server
with multiple ip addresses, and the proper solution would be for such
software to be adapted to use getaddrinfo (mostly based on information
at https://www.akkadia.org/drepper/userapi-ipv6.html).
  User temporarily switched to a single address in /etc/hosts for the server.
  Now the user is testing a rhel6.9 package built with the attached patch,
that is a minor adaptation of the related patches attached to the sourceware
bugzilla.

As Carlos explained in bug 576801 comment 11, we did not plan to make the change in Red Hat Enterprise Linux 6 at the time, and reconsidered the change for Red Hat Enterprise Linux 7.

Adding more IP addresses visible to applications is a change which will break expectations of some users, so it is not appropriate for Red Hat Enterprise Linux 6, which is now in Maintenance Support 2.

*** This bug has been marked as a duplicate of bug 576801 ***