Internet Direct (Indy) Version 9.0.2 Beta
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property TC: Word;
Messages handled by the UDP-based DNS Resolver are restricted to 512 bytes (not counting the UDP headers). Longer messages are truncated and TC is set to 1 in the header. For this reason, the UDP-based TIdDNSResolver does not implement DNS zone transfers, but is the recommended method for standard queries in the Internet.
TC is represented in a DNS header as a bit field. Changing the value of TC insures that the appropriate bit field is updated in the DNS header for the message packet.