DNS
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... port.
As discussed in section 5, existing approaches to using DNS records
for dynamically determining the current host for a given application
...
... 5] and SRV ([3]) DNS resource records. This can be
viewed as a more general version of the use of SRV ...
... (contained in the NAPTR records) are used to determine the successive
DNS lookups until a desirable target is found.
...
... S-NAPTR, the REPLACEMENT field is
used as the target of the next DNS lookup -- for NAPTR RRs.
...
... processing rules. In the case of an "S" flag, the
REPLACEMENT field is used as the target of a DNS query for SRV RRs,
...
...
o the S-NAPTR-designated DNS lookup fails to yield expected results
-- e.g., no A RR for an "A" target ...
... all the features of NAPTR resource records, it is not intended to
imply that DNS resolvers should fail to implement all aspects of the
NAPTR RR ...
...
As noted in section 8, use of the DNS for server location increases
the importance of using protocol ...
...
o The server may be operated by a completely different organization
without having to list the details of that organization's DNS
setup (SRVs).
...
... The purpose here is to define a single, common mechanism (the DDDS
application) to use NAPTR when all that is desired is simple DNS-
based location of services. This should be easy for applications to
...
... [5] specifies that a DDDS Database using the NAPTR DNS resource
record contain the rewrite rules. The Keys for this database are
encoded as domain ...
... requested.
DNS servers MAY interpret Flag values and use that information to
include appropriate NAPTR, SRV ...
... SRV, or A records in the Additional
Information portion of the DNS packet. Clients are encouraged to
check for additional information but are not required to do so. See
...
... information on NAPTR records and the Additional Information section
of a DNS response packet.
...
... application service location is only
as good as the security of the DNS queries along the way. If any of
them is compromised, bogus NAPTR and SRV records ...
... Gulbrandsen, A., Vixie, P., and L. Esibov, "A DNS RR for specifying the location of services (DNS SRV ...
... Dynamic Delegation Discovery System (DDDS) Part Three: The Domain Name System (DNS) Database", RFC 3403prop, October 2002. ...
... Arends, R., Larson, M., Austein, R., and D. Massey, "Protocol Modifications for the DNS Security Extensions", Work in Progress, May 2004. ...
...
o entwine the application-specific protocol with the DNS lookup and
RRset processing described in the pseudocode ...