> A potential optimization is an EDNS option with bitmap of supported > NS+Delegation Types. With that an auth can (optionally) limit RRs > in response only to types supported by the requestor. In future > that might mean that DELEG flag set in the bitmap might mean 'skip > NS'. But even with this bitmap we still need to define rules for > TC=1, which are currently lacking.
Just thinking out loud. Suppose we allocate two EDNS options: delegation-types and information-types. Each option contains a list of 16 bit integers which represent supported types in decreasing order of preference. If the delegation-types option is absent then it is equivalent to one with just NS. Similarly an absent information-types option is equivalent to one with just DS. All the authoritative has to do is go over the list of types in the option, see if it has one of those in the delegation and include the first match. _______________________________________________ DNSOP mailing list -- [email protected] To unsubscribe send an email to [email protected]
