Why do DHCP failover servers (primary and secondary) land into potential-conflict state?

Solution In Progress - Updated -

Issue

DHCP servers (primary and secondary) with failover configuration keep staying on POTENTIAL-CONFLICT.
While the dhcpd is in POTENTIAL-CONFLICT, it cannot deal with any request from DHCP clients. So, it doesn't work as a DHCP server at all.

 dhcpd failover peer dhcp: I move from resolution-interrupted to potential-conflict
 dhcpd failover peer dhcp: peer moves from partner-down to potential-conflict

Environment

  • Red Hat Enterprise Linux 6.4
  • dhcp-4.1.1-34.P1.el6.x86_64 and dhcp-common-4.1.1-34.P1.el6.x86_64

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