Network Working Group                                       P. Faltstrom
Internet-Draft                                                       IAB
Expires: December 9, 2005                                   June 7, 2005

                   Design Choices When Expanding DNS

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Copyright Notice

   Copyright (C) The Internet Society (2005).


   This note discusses how to extend the DNS with new data for a new
   application.  DNS extension discussion too often circulates around
   reuse of the TXT record.  This document lists different mechanisms to
   accomplish the extension to DNS, and comes to the conclusion that the
   use of a new RR Type is the best solution.

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Background . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Extension mechanisms . . . . . . . . . . . . . . . . . . . . .  4
     3.1   Place selectors inside the RDATA . . . . . . . . . . . . .  4
     3.2   Add a prefix to the owner name . . . . . . . . . . . . . .  5
     3.3   Add a suffix to the owner name . . . . . . . . . . . . . .  6
     3.4   Add a new Class  . . . . . . . . . . . . . . . . . . . . .  6
     3.5   Add a new Resource Record Type . . . . . . . . . . . . . .  7
   4.  Conclusion (why adding a new RR type is the answer)  . . . . .  8
   5.  Conclusion and Recommendation  . . . . . . . . . . . . . . . . 10
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 11
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     8.1   Normative References . . . . . . . . . . . . . . . . . . . 11
     8.2   Informative References . . . . . . . . . . . . . . . . . . 12
       Author's Address . . . . . . . . . . . . . . . . . . . . . . . 12
       Intellectual Property and Copyright Statements . . . . . . . . 13

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1.  Introduction

   The DNS stores multiple categories of data.  The two most commonly
   used categories are infrastructure data for the DNS system itself (NS
   and SOA records) and data which have to do with mappings between
   domain names and IP addresses (A, AAAA and PTR).  There are other
   categories as well, some of which are tied to specific applications
   like email (MX), while others are generic record types used to convey
   information for multiple protocols (SRV, NAPTR).

   When storing data in DNS for a new application, the data are usually
   tied to a "normal" domain name, so the application can query for the
   data it wants, while minimizing the impact on existing applications.

   Historically, extending DNS to store data for applications tied to a
   domain name has been done in different ways at different times.  MX
   records were created as a new resource record type specifically
   designed to support electronic mail.  SRV records are a generic type
   which use a prefixing scheme in combination with a base domain name.
   Records associated with ENUM use a suffixing scheme.  NAPTR records
   add selection data inside the RDATA.  It is clear the way of adding
   new data to the DNS has been inconsistent, and the purpose of this
   document is to attempt to clarify the implications of each of these
   methods, both for the applications that use them and for the rest of
   the DNS system.

   Many parts of this document talk about use of wildcards, and many
   people might think use of wildcards is not something that happens
   today.  In reality thoug, wildcards are in use, especially for some
   specific usages like MX records.  Because of this, the choice have to
   be made with existence of wildcards in mind.

   Another overall issue that have to be taken into account is what the
   new data in DNS is to describe.  In some cases it might be completely
   new data.  In other cases it might be meta-data that is tied to data
   that already exists in DNS.  An example of new data is key
   information for SSH and data used for fighting spam (meta data that
   is connected to the MX record).  If the new data has connection to
   data that already exists in DNS, an analysis should be made as to
   whether having (for example) A record and SSH key information in
   different zones is a problem, and if it is, whether the owner for the
   records by design must be the same for both records.

   This document does not talk about what one should store in DNS.  It
   also doesn't discuss whether DNS is used for service discovery, or
   whether DNS is (also) used for storage of data specific for the
   service.  In general, DNS is a protocol that apart from holding
   metadata that makes DNS itself function (NS, SOA, DS RR Types etc)

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   only holds references to where services are located (SRV, NAPTR, A,
   AAAA RR types).

2.  Background

   See RFC 2929 [RFC2929] for a brief summary of DNS query structure.
   Readers interested in the full story should start with the base DNS
   specification in RFC 1035 [RFC1035], and continue with the various
   documents which update, clarify, and extend the base specification.

   When composing a query against the DNS system, the parameters
   actually used by the protocol are a triple: a DNS name, a DNS class,
   and a DNS record type.  Every resource record (RR) matching a
   particular name, type and class is said to belong to the same
   resource record set (RRSet), and the whole RRSet is always returned
   to the client which queries for it.  Splitting an RRSet is a protocol
   violation, because it results in coherency problems with the DNS
   caching mechanism.

   Note that most of the discussions around MTU size is about the size
   of the whole DNS packet, and not about the size of an RRSet
   explicitly.  A DNS packet is to fit in the MTU size when using UDP,
   or else a truncated response is given back from the server (at which
   point the client can reissue the query over TCP).

3.  Extension mechanisms

   The DNS protocol is intended to be extensible to support new kinds of
   data.  This section examines the various ways in which this sort of
   extension can be accomplished.

3.1  Place selectors inside the RDATA

   For a given query name, one might choose to have a single RRSet (all
   sharing the same name, type, and class) shared by multiple
   applications, and have the different applications use selectors
   within the RR data (RDATA) to determine which records are intended
   for which applications.  This sort of selector mechanism is usually
   referred to "subtyping", because it is in effect creating an
   additional type subsystem within a single DNS RR type.

   Examples of subtyping include NAPTR RRs (see RFC 3761 [RFC3761]) and
   the original DNSSEC KEY RR type (RFC 2535 [RFC2535]) (before it was
   updated by RFC 3445 [RFC3445]).

   All DNS subtyping schemes share a common weakness: With subtyping
   schemes it is impossible for a client to query for just the data it
   wants.  Instead, the client must fetch the entire RRSet, then select

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   the RRs in which it is interested.  Furthermore, since DNSSEC
   signatures operate on complete RRSets, the entire RRSet must be re-
   signed if any RR in it changes.  As a result, each application that
   uses a subtyped RR incurs higher overhead than any of the
   applications would have incurred had they not been using a subtyping
   scheme.  The fact the RRSet is always passed around as an indivisible
   unit increases the risk the RRSet will not fit in a UDP packet, which
   in turn increases the risk that the client will have to retry the
   query with TCP, which substantially increases the load on the name
   server.  More precisely: Having one query fail over to TCP is not a
   big deal, but since the typical ratio of clients to servers in the
   DNS system is very high, having a substantial number of DNS messages
   fail over to TCP may cause the queried name servers to be overloaded
   by TCP overhead.

   To conclude, because of the limitations of the size of one RRSet is
   that not all services tied to a domain can be announced, but instead
   selected (by the zone administrator).  This because all of them can
   not be announced at the same time.

3.2  Add a prefix to the owner name

   By adding an application-specific prefix to a domain name, we get
   different name/class/type triples, and therefore different RRSets.
   One problem with adding prefixes has to do with wildcards, especially
   if one has records like

   * IN MX 1

   and one wants records tied to those names.  Suppose one creates the
   prefix "_mail".  One would then have to say something like

   _mail.* IN X-FOO A B C D

   but DNS wildcards only work with the "*" as the leftmost token in the
   domain name.

   Even when a specific prefix is chosen, the data will still have to be
   stored in some RR type.  This RR type can either be a record type
   that can store arbitrary data or a new RR type.  This implies that
   some other selection mechanism has to be applied as well, such as
   ability to distinguish between the records in an RR set given they
   have the same RR type (see also draft-ietf-dnsext-wcard-clarify
   [wcardclarify] regarding use of wildcards and DNS).  Because of this,
   one needs both register a unique prefix and define what RR type is to
   be used for this specific service.

   If the record has some relationship with another record in the zone,

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   the fact the two records can be in different zones might have
   implications on the trust the application have in the records.
   Example:      IN MX    10 IN X-BAR "metadata for the mail service"

   In this example, the two records might be in two different zones, and
   because of this signed by two different organizations when using

3.3  Add a suffix to the owner name

   Adding a suffix to a domain name changes the name/class/type triple,
   and therefore the RRSet.  In this case, since the query name can be
   set to exactly the data one wants the size of the RRSet is minimized.
   The problem with adding a suffix is that it creates a parallel tree
   within the IN class.  Further, there is no technical mechanism to
   ensure that the delegation for "" and ""
   are made to the same organization.  Furthermore, data associated with
   a single entity will now be stored in two different zones, such as
   "" and "", which, depending on who
   controls "_bar", can create new synchronization and update
   authorization issues.

   Even when using a different name, the data will still have to be
   stored in some RR type.  This RR type can either be a "kitchen-sink
   record" or a new RR type.  This implies that some other mechanism has
   to be applied as well, with implications detailed in other parts of
   this note.

   In RFC 2163 [RFC2163] an infix token is inserted directly below the
   TLD, but the result is the same as adding a suffix to the owner name
   (and because of that creation of a new TLD).

3.4  Add a new Class

   DNS zones are class-specific in the sense that all the records in
   that zone share the same class as the zone's SOA record and the
   existence of a zone in one class does not guarantee the existence of
   the zone in any other class.  In practice, only the IN class has ever
   seen widespread deployment, and the administrative overhead of
   deploying an additional class would almost certainly be prohibitive.

   Nevertheless, one could in theory use the DNS class mechanism to
   distinguish between different kinds of data.  However, since the DNS
   delegation tree (represented by NS RRs) is itself tied to a specific
   class, attempting to resolve a query by crossing a class boundary may

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   produce unexpected results, because there is no guarantee that the
   name servers for the zone in the new class will be the same as the
   name servers in the IN class.  The MIT Hesiod system used a scheme
   like this for storing data in the HS class, but only on a very small
   scale (within a single institution), and with an administrative fiat
   requiring that the delegation trees for the IN and HS trees be

   Even when using a different class, the data will still have to be
   stored in some RR type or another.  This RR type can either be a
   "kitchen-sink record" or a new RR type.  This implies that some other
   mechanism has to be applied as well, with implications detailed in
   other parts of this note.

3.5  Add a new Resource Record Type

   When adding a new Resource Record type to the system, entities in
   four different roles have to be able to handle the new type:

   1.  There must be a way to insert the new resource records into the
       zone of the Primary Master name server.  For some server
       implementations, the user interface only accepts record types
       which it understands (perhaps so that the implementation can
       attempt to validate the data).  Other implementations allow the
       zone administrator to enter an integer for the resource record
       type code and the RDATA in Base64 or hexadecimal encoding (or
       even as raw data).  RFC 3597 [RFC3597] specifies a standard
       generic encoding for this purpose.
   2.  A slave authoritative name server must be able to do a zone
       transfer, receive the data from some other authoritative name
       server, and serve data from the zone even though the zone
       includes records of unknown types.  Historically, some
       implementations have had problems parsing stored copies of the
       zone file after restarting, but those problems have not been seen
       for a few years.
   3.  A full service resolver will cache the records which are
       responses to queries.  As mentioned in RFC 3597 [RFC3597],there
       are various pitfalls where a recursive name server might end up
       having problems.
   4.  The application must be able to get the record with a new
       resource record type.  The application itself may understand the
       RDATA, but the resolver library might not.  Support for a generic
       interface for retrieving arbitrary DNS RR types has been a
       requirement since 1989 (see RFC 1123 [RFC1123] Section
       Some stub resolver library implementations neglect to provide
       this functionality and cannot handle unknown RR types, but
       implementation of a new stub resolver library is not particularly
       difficult, and open source libraries that already provide this

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       functionality are available.

4.  Conclusion (why adding a new RR type is the answer)

   By now, the astute reader will be wondering how to use the issues
   presented so far.  We will now attempt to clear up the reader's
   confusion by following the thought processes of a typical application
   designer who wishes to store data in DNS, showing how such a designer
   almost inevitably hits upon the idea of just using TXT RR, and why
   this is a bad thing, and instead why a new RR type is to be

   The overall problem with most solutions has to do with two main
   o  No semantics to prevent collision with other use
   o  Space considerations (in the DNS message)

   A typical application designer is not interested in the DNS for its
   own sake, but rather as a distributed database in which application
   data can be stored.  As a result, the designer of a new application
   is usually looking for the easiest way to add whatever new data the
   application needs to the DNS in a way that naturally associates the
   data with a DNS name.

   As explained in Section 3.4, using the DNS class system as an
   extension mechanism is not really an option, and in fact most users
   of the system don't even realize that the mechanism exists.  As a
   practical matter, therefore any extension is likely to be within the
   IN class.

   Adding a new RR type is the technically correct answer from the DNS
   protocol standpoint (more on this below), but doing so requires some
   DNS expertise, due to the issues listed in Section 3.5.  As a result,
   this option is usually considered.  Note that according to RFC2929
   [RFC2929], some types require IETF Consensus, while others only
   require a specification.

   The application designer is thus left with the prospect of reusing
   some existing DNS type within the IN class, but when the designer
   looks at the existing types, almost all of them have well-defined
   semantics, none of which quite match the needs of the new
   application.  This has not completely prevented proposals to reuse
   existing RR types in ways incompatible with their defined semantics,
   but it does tend to steer application designers away from this

   RR Type 40 was registered for the SINK record type.  This RR Type was
   discussed in the DNSIND working group of the IETF, and it was decided

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   at the 46th IETF to not move the I-D forward to become an RFC.
   Reason was the risk for large RR sets and the ability for application
   creators to use the SINK RR Type instead of registering a new RR

   Eliminating all of the above leaves the TXT RR type in the IN class.
   The TXT RDATA format is free form text, and there are no existing
   semantics to get in the way.  Furthermore, the TXT RR can obviously
   just be used as a bucket in which to carry around data to be used by
   some higher level parser, perhaps in some human readable programming
   or markup language.  Thus, for many applications, TXT RRs are the
   "obvious" choice.  Unfortunately, this conclusion, while
   understandable, is also wrong, for several reasons.

   The first reason why TXT RRs are not well suited to such use is
   precisely the lack of defined semantics that make them so attractive.
   Arguably, the TXT RR is misnamed, and should have been called the
   Local Container record, because the lack of defined semantics means
   that a TXT RR means precisely what the data producer says it means.
   This is fine, so long as TXT RRs are being used by human beings or by
   private agreement between data producer and data consumer.  However,
   it becomes a problem once one starts using them for standardized
   protocols in which there is no prior relationship between data
   producer and data consumer.  Reason for this is that there is nothing
   to prevent collisions with some other incompatible use of TXT RRs.
   This is even worse than the general subtyping problem described in
   Section 3.1, because TXT RRs don't even have a standardized selector
   field in which to store the subtype.  RFC1464 [RFC1464] tried, but it
   was not a success.  At best a definition of a subtype is reduced to
   hoping that whatever scheme one has come up with will not accidently
   conflict with somebody else's subtyping scheme, and that it will not
   be possible to mis-parse one application's use of TXT RRs as data
   intended for a different application.  Any attempt to come up with a
   standardized format within the TXT RR format would be at least
   fifteen years too late even if it were put into effect immediately.

   Using one of the naming modifications discussed in Section 3.2 and
   Section 3.3 would address the subtyping problem, but each of these
   approaches brings in new problems of its own.  The prefix approach
   (such as SRV RRs use) does not work well with wildcards, which is a
   particular problem for mail-related applications, since MX RRs are
   probably the most common use of DNS wildcards.  The suffix approach
   doesn't have wildcard issues, but, as noted previously, it does have
   synchronization and update authorization issues, since it works by
   creating a second subtree in a different part of the global DNS name

   The next reason why TXT RRs are not well suited to protocol use has

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   to do with the limited data space available in a DNS message.  As
   alluded to briefly in Section 3.1, typical DNS query traffic patterns
   involve a very large number of DNS clients sending queries to a
   relatively small number of DNS servers.  Normal path MTU discovery
   schemes do little good here, because, from the server's perspective,
   there isn't enough repeat traffic from any one client for it to be
   worth retaining state.  UDP-based DNS is an idempotent query, whereas
   TCP-based DNS requires the server to keep state (in the form of TCP
   connection state, usually in the server's kernel) and roughly triples
   the traffic load.  Thus, there's a strong incentive to keep DNS
   messages short enough to fit in a UDP datagram, preferably a UDP
   datagram short enough not to require IP fragmentation.

   Subtyping schemes are therefore again problematic, because they
   produce larger RRSets than necessary, but verbose text encodings of
   data are also wasteful, since the data they hold can usually be
   represented more compactly in a resource record designed specifically
   to support the application's particular data needs.  If the data that
   need to be carried are so large that there is no way to make them fit
   comfortably into the DNS regardless of encoding, it is probably
   better to move the data somewhere else, and just use the DNS as a
   pointer to the data, as with NAPTR.

5.  Conclusion and Recommendation

   Given the problems detailed in Section 4, it is worth reexamining the
   oft-jumped-to conclusion that specifying a new RR type is hard.
   Historically, this was indeed the case, but recent surveys suggest
   that support for unknown RR types [RFC3597] is now widespread, and
   that lack of support for unknown types is mostly an issue for
   relatively old software that would probably need to be upgraded in
   any case as part of supporting a new application.  One should also
   remember that deployed DNS software today should support DNSSEC, and
   software recent enough to do so will have higher chance of being able
   to also support RFC3597.

   Of all the issues detailed in Section 3.5, provisioning the data is
   in some respects the most difficult.  The problem here is less the
   authoritative name servers themselves than the front-end systems used
   to enter (and perhaps validate) the data.  Hand editing does not work
   well for maintenance of large zones, so some sort of tool is
   necessary, and the tool may not be tightly coupled to the name server
   implementation itself.  Note, however, that this provisioning problem
   exists to some degree with any new form of data to be stored in DNS,
   regardless of data format, RR type, or naming scheme.  Adapting
   front-end systems to support a new RR type may be a bit more
   difficult than reusing an existing type, but this appears to be a
   minor difference in degree rather than a difference in kind.

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   Given the various issues described in this note, we believe that:
   o  there is no magic solution which allows a completely painless
      addition of new data to the DNS, but
   o  on the whole, the best solution is still to use the DNS type
      mechanism designed for precisely this purpose, and
   o  of all the alternate solutions, the "obvious" approach of using
      TXT RRs is almost certainly the worst.
   This especially for the two reasons outlined above (lack of semantics
   and its implications, and size leading to the need to use TCP).

6.  IANA Considerations

   This document does not require any IANA actions.

7.  Security Considerations

   DNS RRSets can be signed using DNSSEC.  DNSSEC is almost certainly
   necessary for any application mechanism that stores authorization
   data in DNS.  DNSSEC signatures significantly increase the size of
   the messages transported, and because of this, the DNS message size
   issues discussed in Section 3.1 and Section 4 are more serious than
   they might at first appear.

   Adding new RR types (as discussed in Section 3.5) might conceivably
   trigger bugs and other bad behavior in software which is not
   compliant with RFC 3597 [RFC3597], but most such software is old
   enough and insecure enough that it should be updated for other
   reasons in any case.  Basic API support for retrieving arbitrary RR
   types has been a requirement since 1989 (see RFC 1123 [RFC1123]).

   Any new protocol that proposes to use the DNS to store data used to
   make authorization decisions would be well advised not only to use
   DNSSEC but also to encourage upgrades to DNS server software recent
   enough not to be riddled with well-known exploitable bugs.  Because
   of this, support for new RR Types will not be as hard as people might
   think at first.

8.  References

8.1  Normative References

   [RFC1035]  Mockapetris, P., "Domain names - implementation and
              specification", STD 13, RFC 1035, November 1987.

   [RFC1464]  Rosenbaum, R., "Using the Domain Name System To Store
              Arbitrary String Attributes", RFC 1464, May 1993.

   [RFC2535]  Eastlake, D., "Domain Name System Security Extensions",

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              RFC 2535, March 1999.

   [RFC2671]  Vixie, P., "Extension Mechanisms for DNS (EDNS0)",
              RFC 2671, August 1999.

   [RFC3597]  Gustafsson, A., "Handling of Unknown DNS Resource Record
              (RR) Types", RFC 3597, September 2003.

8.2  Informative References

   [RFC1123]  Braden, R., "Requirements for Internet Hosts - Application
              and Support", STD 3, RFC 1123, October 1989.

   [RFC2163]  Allocchio, C., "Using the Internet DNS to Distribute MIXER
              Conformant Global Address Mapping (MCGAM)", RFC 2163,
              January 1998.

   [RFC2606]  Eastlake, D. and A. Panitz, "Reserved Top Level DNS
              Names", BCP 32, RFC 2606, June 1999.

   [RFC2929]  Eastlake, D., Brunner-Williams, E., and B. Manning,
              "Domain Name System (DNS) IANA Considerations", BCP 42,
              RFC 2929, September 2000.

   [RFC3232]  Reynolds, J., "Assigned Numbers: RFC 1700 is Replaced by
              an On-line Database", RFC 3232, January 2002.

   [RFC3445]  Massey, D. and S. Rose, "Limiting the Scope of the KEY
              Resource Record (RR)", RFC 3445, December 2002.

   [RFC3761]  Faltstrom, P. and M. Mealling, "The E.164 to Uniform
              Resource Identifiers (URI) Dynamic Delegation Discovery
              System (DDDS) Application (ENUM)", RFC 3761, April 2004.

              Halley, B. and E. Lewis,
              "draft-ietf-dnsext-wcard-clarify-05.txt, The Role of Wild
              Card Domains in the Domain Name System, work in progress",
              September 2003.

Author's Address

   Patrik Faltstrom


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