What is the upper limit of response MSG SIZE of BIND

Solution Unverified - Updated -

Issue

  • Whats the upper limit of response size of BIND

When BIND dns server received query from client, bind will attempt to reply using UDP at first.
But in some case BIND switch the connection mode using TCP.
What is the threshold for this behaviour in each case ?

  • UDP size limit:DNS query without dnssec option
  • UDP size limit:DNS query with dnssec option
  • TCP size limit:DNS query without dnssec option
  • TCP size limit:DNS query with dnssec option

Environment

  • Red Hat Enterprise Linux 5.x, 6.x
  • Bind 9.3* , 9.7*

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