BIND 10 #891: Retry forward query over TCP when getting a truncated response.

[BIND 10 Development]

#891: Retry forward query over TCP when getting a truncated response.
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            Reporter:  zhanglikun    |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    Milestone:  New
           Component:  resolver      |  Tasks
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 Currently, the forward query doesn't have the ability to retry over TCP
 when getting a truncated response. It should add the support for it.
 Following is the comments in ticket# 598 given by vorner.

 "What should the forwarder do with TCP anyway? Ask over UDP if the request
 come over UDP and use TCP if it comes over TCP? Is it possible with our
 current framework? "

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Ticket URL: <http://bind10.isc.org/ticket/891>
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BIND 10 Development