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Appendix A. Changes since RFCs 2671 and 2673

Appendix A. Changes since RFCs 2671 and 2673​

Following is a list of high-level changes to RFCs 2671 and 2673.

  • Support for the OPT record is now mandatory.

  • Extended label types remain available, but their use is discouraged as a general solution due to observed difficulties in their deployment on the Internet, as illustrated by the work with the "Binary Labels" type.

  • RFC 2673, which defined the "Binary Labels" type and is currently Experimental, is requested to be moved to Historic.

  • Made changes in how EDNS buffer sizes are selected, and provided recommendations on how to select them.

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