6.1.5 DOMAIN NAME SYSTEM REQUIREMENTS SUMMARY

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FEATURE                                        |SECTION    | | | |T|T|e
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GENERAL ISSUES                                 |           | | | | | |
                                               |           | | | | | |
Implement DNS name-to-address conversion       |6.1.1      |x| | | | |
Implement DNS address-to-name conversion       |6.1.1      |x| | | | |
Support conversions using host table           |6.1.1      | | |x| | |
Properly handle RR with zero TTL               |6.1.2.1    |x| | | | |
Use QCLASS=* unnecessarily                     |6.1.2.2    | |x| | | |
  Use QCLASS=IN for Internet class             |6.1.2.2    |x| | | | |
Unused fields zero                             |6.1.2.3    |x| | | | |
Use compression in responses                   |6.1.2.4    |x| | | | |
                                               |           | | | | | |
Include config info in responses               |6.1.2.5    | | | | |x|
Support all well-known, class-indep. types     |6.1.3.5    |x| | | | |
Easily expand type list                        |6.1.3.5    | |x| | | |
Load all RR types (except MD and MF)           |6.1.3.6    |x| | | | |
Load MD or MF type                             |6.1.3.6    | | | | |x|
Operate when root servers, etc. unavailable    |6.1.3.7    |x| | | | |
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RESOLVER ISSUES:                               |           | | | | | |
                                               |           | | | | | |
Resolver support multiple concurrent requests  |6.1.3.1    | |x| | | |
Full-service resolver:                         |6.1.3.1    | | |x| | |
  Local caching                                |6.1.3.1    |x| | | | |
  Information in local cache times out         |6.1.3.1    |x| | | | |
  Configurable with starting info              |6.1.3.1    | |x| | | |
Stub resolver:                                 |6.1.3.1    | | |x| | |
  Use redundant recursive name servers         |6.1.3.1    |x| | | | |
  Local caching                                |6.1.3.1    | | |x| | |
  Information in local cache times out         |6.1.3.1    |x| | | | |
Support for remote multi-homed hosts:          |           | | | | | |
  Sort multiple addresses by preference list   |6.1.3.4    | |x| | | |
                                               |           | | | | | |
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TRANSPORT PROTOCOLS:                           |           | | | | | |
                                               |           | | | | | |
Support UDP queries                            |6.1.3.2    |x| | | | |
Support TCP queries                            |6.1.3.2    | |x| | | |
  Send query using UDP first                   |6.1.3.2    |x| | | | |1
  Try TCP if UDP answers are truncated         |6.1.3.2    | |x| | | |
Name server limit TCP query resources          |6.1.3.2    | | |x| | |
  Punish unnecessary TCP query                 |6.1.3.2    | | | |x| |
Use truncated data as if it were not           |6.1.3.2    | | | | |x|
Private agreement to use only TCP              |6.1.3.2    | | |x| | |
Use TCP for zone transfers                     |6.1.3.2    |x| | | | |
TCP usage not block UDP queries                |6.1.3.2    |x| | | | |
Support broadcast or multicast queries         |6.1.3.2    | | |x| | |
  RD bit set in query                          |6.1.3.2    | | | | |x|
  RD bit ignored by server is b'cast/m'cast    |6.1.3.2    |x| | | | |
  Send only as occasional probe for addr's     |6.1.3.2    | |x| | | |
-----------------------------------------------|-----------|-|-|-|-|-|--
RESOURCE USAGE:                                |           | | | | | |
                                               |           | | | | | |
Transmission controls, per [DNS:2]             |6.1.3.3    |x| | | | |
  Finite bounds per request                    |6.1.3.3    |x| | | | |
Failure after retries => soft error            |6.1.3.3    |x| | | | |
Cache temporary failures                       |6.1.3.3    | |x| | | |
Cache negative responses                       |6.1.3.3    | |x| | | |
Retries use exponential backoff                |6.1.3.3    | |x| | | |
  Upper, lower bounds                          |6.1.3.3    | |x| | | |
Client handle Source Quench                    |6.1.3.3    | |x| | | |
Server ignore Source Quench                    |6.1.3.3    | | |x| | |
-----------------------------------------------|-----------|-|-|-|-|-|--
USER INTERFACE:                                |           | | | | | |
                                               |           | | | | | |
All programs have access to DNS interface      |6.1.4.2    |x| | | | |
Able to request all info for given name        |6.1.4.2    |x| | | | |
Returns complete info or error                 |6.1.4.2    |x| | | | |
Special interfaces                             |6.1.4.2    | | |x| | |
  Name<->Address translation                   |6.1.4.2    |x| | | | |
                                               |           | | | | | |
Abbreviation Facilities:                       |6.1.4.3    | | |x| | |
  Convention for complete names                |6.1.4.3    |x| | | | |
  Conversion exactly once                      |6.1.4.3    |x| | | | |
  Conversion in proper context                 |6.1.4.3    |x| | | | |
  Search list:                                 |6.1.4.3    | | |x| | |
    Administrator can disable                  |6.1.4.3    | |x| | | |
    Prevention of excessive root queries       |6.1.4.3    |x| | | | |
      Both methods                             |6.1.4.3    | |x| | | |
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1.   Unless there is private agreement between particular resolver and
     particular server.