Bind version with RHEL6 and RHEL7 doesn't handle zero ttl domain properly.
Issue
- Bind versions shipped with RHEL6 and RHEL7 doesn't handle zero ttls domains/subdomain properly.
- It send single query to reference/forwarder instead of multiple.
Environment
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Bind before bind-9.9.4-69.el7
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