BIND 10 #3195: Kea6: Relayed traffic must be supported on unicast addresses

[BIND 10 Development]

#3195: Kea6: Relayed traffic must be supported on unicast addresses
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            Reporter:  tomek         |                        Owner:
                Type:  defect        |  UnAssigned
            Priority:  very high     |                       Status:
           Component:  dhcp6         |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-DHCP-20131016
         Sub-Project:  DHCP          |                   Resolution:
Estimated Difficulty:  0             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:
                                     |  Medium
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by tomek):

 * owner:   => UnAssigned
 * status:  new => reviewing


Comment:

 The fix for this issue has been implemented. This covers the sockets
 creation and actual traffic handling. It does not cover responding with
 UseMulticast status (see #3077).

 This is a tricky code to unit-test. It was extensively tested on my VM
 setup, but also during dry-run.

 I think the ultimate solution to deal with unit-testing this type of
 features will be to have a small script that has to be run on a test
 machine before tests are executed. Such a script will set up well known
 addresses on loopback. BIND9 does similar thing. The other alternative, to
 write mockup sockets, is less appealing, as it would not test whether the
 sockets are really usable for sending and receiving data (e.g. would not
 catch binding issues).

 Please review.

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Ticket URL: <http://bind10.isc.org/ticket/3195#comment:1>
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