BIND 10 #861: Check max udp packet size(buffer size) carried by edns0 message

[BIND 10 Development]

#861: Check max udp packet size(buffer size) carried by edns0 message
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            Reporter:  zhanglikun    |                        Owner:
                Type:  enhancement   |                       Status:  new
            Priority:  major         |                    Milestone:  New
           Component:  Unclassified  |  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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 When resolver geting a query with DO bit from a client, the max udp packet
 size should be checked. Once the size of answer message is bigger the max
 size, tcp query should be triggered.

 Currently the simplest forwarder doesn't check, always treate the max udp
 packet size of query client is 4096.(see more in ticket#598)

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Ticket URL: <http://bind10.isc.org/ticket/861>
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BIND 10 Development