Subject: DAD failure for global IPv6 addresses?

From: <[email-masked]>
Date: Thu, 1 Jan 2009 03:43:10 +0200

All,
 
I have a question about what the correct behaviour should be for a router if a global address fails DAD.
 
Specifically, if an interface has a link-local address which passes DAD, but also has a global address configured which is not based on the hardware address, and which fails DAD, what packets should be allowed in/out of the interface?
 
Should the system behave exactly as though the global address was absent? That is, should the router forward packets to or from the failed address/network based on whatever routes exist in the forwarding table?
 
Or should all packets to/from the failed address/network be checked for and dropped?
 
Any clarification would be much appreciated.
 
Peter Hunt
Kernel Engineer
Nokia
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