Comments on draft-jinmei-ipv6-rfc2462bis-00.txt

["Christian Huitema" <huitema@windows.microsoft.com>]

The section "5.4.5 When Duplicate Address Detection Fails" currently
says:

   A tentative address that is determined to be a duplicate as described
   above, MUST NOT be assigned to an interface and the node SHOULD log a
   system management error.  If the address is a link-local address
   formed from an interface identifier, the interface SHOULD be
   disabled.

The part about disabling the interface enables a DOS attack: wait for a
target to come on line and send a DAD packet, reply with a deliberate
collision, and poof the target is disconnected from the network. 

Proposed resolution: write "MAY be disabled" instead.

-- Christian Huitema

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