Oracle Solaris Implementation Duplicate Address Detection (DAD)
Last updated on AUGUST 17, 2016
Applies to:Solaris Operating System - Version 10 8/07 U4 and later
Information in this document applies to any platform.
Oracle Solaris 10 Update 4 (Oracle Solaris 10 8/07) introduced Duplicate Address Detection (DAD) for IPv4 and since then it has been enabled by default on all IPv4 interfaces. IPv6 interfaces has been enabled by default since Solaris 8.
The goal of Duplicate Address Detection is to address the problem of 2 nodes configuring the same IP address on their interfaces. Before Duplicate Address Detection this could be complex to diagnose issues with symptoms varying from intermittent application connectivity to complete application failures. In most cases both node suffered some problems to some degree. The common reasons are administrative errors in IP assignment or mis-configured DHCP servers in their IP address assignment (most modern DHCP will try and resolve the IP address to see if it is in use first with ICMP echo request/reply, sometimes that does not always work for various reason, it's beyond the scope of this document to discuss that here).
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