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-
-
- Operational Requirements for X.400 Management Domains
-
- in the GO-MHS Community
-
- October 15, 1993
-
- Robert A. Hagens
- hagens@ans.net
- DDA.RFC-822=hagens(a)ans.net; P=INTERNET; C=US
-
- Alf Hansen
- Alf.Hansen@uninett.no
- G=Alf; S=Hansen; O=uninett; P=uninett; C=no
- Alf.Hansen@uninett.no
-
- $ Revision: 1.18 $
-
- <draft-ietf-x400ops-mgtdomains-ops-06.txt>
-
-
- Status of this Memo
-
-
- This document specifies a set of minimal operational
- requirements that shall be implemented by all Management
- Domains (MDs) in the Global Open MHS Community (GO-MHS).
- This document defines the core operational requirements; in
- some cases, technical detail is handled by reference to
- other documents.
-
- The GO-MHS Community is defined as all organizations which
- meet the requirements described in this document.
-
- This document is an Internet Draft. Internet Drafts are
- working documents of the Internet Engineering Task Force
- (IETF), its Areas, and its Working Groups. Note that other
- groups may also distribute working documents as Internet
- Drafts.
-
- Internet Drafts are draft documents valid for a maximum of
- six months. Internet Drafts may be updated, replaced, or
- obsoleted by other documents at any time. It is not
- appropriate to use Internet Drafts as reference material or
- to cite them other than as a "working draft" or "work in
- progress."
-
- Please check the I-D abstract listing contained in each
- Internet Draft directory to learn the current status of this
- or any other Internet Draft.
-
- When agreement is reached, it will be submitted to the RFC
- editor as an experimental RFC. Distribution of this memo is
- unlimited. Please send comments to the authors or to the
-
-
- INTERNET-DRAFT [Page 1] Exp. Date: 04/15/94
-
- discussion group:
-
- ietf-osi-x400ops@cs.wisc.edu
- S=ietf-osi-x400ops; OU1=cs; O=UW-Madison; P=xnren; C=us
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- INTERNET-DRAFT [Page 2] Exp. Date: 04/15/94
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- 1. Introduction
-
- There are several large, operational X.400 services
- currently deployed. Many of the organizations in these ser-
- vices are connected to the Internet. A number of other
- Internet-connected organizations are beginning to operate
- internal X.400 services (for example, U.S. government organ-
- izations following U.S. GOSIP). The motivation for this
- document is to foster a GO-MHS Community that has full
- interoperability with the existing E-mail service based on
- RFC-822.
-
- The goal of this document is to unite regionally operated
- X.400 services on the various continents into one GO-MHS
- Community (as seen from an end-user's point of view). Exam-
- ples of such regional services are the COSINE MHS Service in
- Europe and the XNREN service in the U.S.
-
- A successful GO-MHS Community is dependent on decisions at
- both the national and international level. National X.400
- service providers are responsible for the implementation of
- the minimum requirements defined in this document. In addi-
- tion to these minimum requirements, national requirements
- may be defined by each national service provider.
-
- This document refers to other documents which are published
- as RFCs. These documents are [1], [2], [3], [4], [6] and [7]
- in the reference list.[1]
-
- This document handles issues concerning X.400 1984 and X.400
- 1988 to 1984 downgrading. Issues concerning pure X.400 1988
- are left for further study.
-
- We are grateful to Allan Cargille and Lawrence Landweber for
- their input and guidance on this paper. This paper is also a
- product of discussions in the IETF X.400 Operations WG and
- the RARE WG-MSG (former RARE WG1 (on MHS)).
-
-
- 1.1. Terminology
-
- This document defines requirements, recommendations and con-
- ventions. Throughout the document, the following defini-
- tions apply: a requirement is specified with the word shall.
- A recommendation is specified with the word should. A con-
- vention is specified with the word might. Conventions are
- intended to make life easier for RFC-822 systems that don't
-
- [1] Note: Reference [4] will be submitted to the IESG as
- Proposed Standard together with the submission of this docu-
- ment.
-
-
-
-
- INTERNET-DRAFT [Page 3] Exp. Date: 04/15/94
-
- follow the host requirements.
-
-
- 1.2. Profiles
-
- Different communities have different profile requirements.
- The following is a list of such profiles.
-
- o U.S. GOSIP - unspecified version
- o ENV - 41201
- o UK GOSIP for X.400(88)
-
- In the case when mail traffic is going from the RFC-822 mail
- service to the GO-MHS Community, the automatic return of
- contents when mail is non-delivered should be requested by
- RFC 1327 gateways and should be supported at the MTA that
- generates the non-delivery report. However, it should be
- noted that this practice maximizes the cost associated with
- delivery reports.
-
-
- 2. Architecture of the GO-MHS Community
-
- In order to facilitate a coherent deployment of X.400 in the
- GO-MHS Community it is necessary to define, in general
- terms, the overall structure and organization of the X.400
- service. This section is broken into several parts which
- discuss management domains, lower layer connectivity issues,
- and overall routing issues.
-
- The GO-MHS Community will operate as a single MHS community,
- as defined in reference [1].
-
-
- 2.1. Management Domains
-
- The X.400 model supports connectivity between communities
- with different service requirements; the architectural vehi-
- cle for this is a Management Domain. Management domains are
- needed when different administrations have different
- specific requirements. Two types of management domains are
- defined by the X.400 model: an Administration Management
- Domain (ADMD) and a Private Management Domain (PRMD).
-
- Throughout the world in various countries there are dif-
- ferent organizational policies for MDs. All of these poli-
- cies are legal according to the X.400 standard. Currently,
- X.400 service providers in a country (inside or outside the
- GO-MHS Community), are organized as:
-
- a) One or several ADMDs.
- b) One or several PRMDs and with no ADMDs present in
- the country, or that are not connected to any ADMD.
-
-
- INTERNET-DRAFT [Page 4] Exp. Date: 04/15/94
-
- c) One or several PRMDs connected to one or several ADMDs.
-
-
- Or in combinations of a), b) and c). At this stage it is
- not possible to say which model is the most effective.
- Thus, the GO-MHS Community shall allow every model.
-
-
- 2.2. The RELAY-MTA
-
- The X.400 message routing decision process takes as input
- the destination O/R address and produces as output the name
- (and perhaps connection information) of the MTA who will
- take responsibility of delivering the message to the reci-
- pient. The X.400 store and forward model permits a message
- to pass through multiple MTAs. However, it is generally
- accepted that the most efficient path for a message to take
- is one where a direct connection is made from the originator
- to the recipient's MTA.
-
- Large scale deployment of X.400 in the GO-MHS Community will
- require a well deployed directory infrastructure to support
- routing. In the GO-MHS Community X.500 is considered to be
- the best protocol for such an infrastructure. In this
- environment, a routing decision can be made by searching the
- directory with a destination O/R address in order to obtain
- the name of the next hop MTA. This MTA may be a central
- entry point into an MD, or it may be the destination MTA
- within an MD.
-
- Deployment of X.400 without a well deployed Directory
- infrastructure, will require the use of static tables to
- store routing information. These tables (keyed on O/R
- addresses), will be used to map a destination O/R address to
- a next hop MTA. In order to facilitate efficient routing,
- one could build a table that contains information about
- every MTA in every MD. However, this table would be enor-
- mous and very dynamic, so this is not feasible in practice.
- Therefore, it is necessary to use the concept of a RELAY-
- MTA.
-
- The purpose of a RELAY-MTA is to act as a default entry
- point into an MD. The MTA that acts as a RELAY MTA for an MD
- shall be capable of accepting responsibility for all mes-
- sages that it receives that are destined for well-defined
- recipients in that MD.
-
- The use of a RELAY-MTA for routing is defined by reference
- [1]. RELAY-MTAs in the GO-MHS Community shall route accord-
- ing to reference [1].
-
-
-
-
-
- INTERNET-DRAFT [Page 5] Exp. Date: 04/15/94
-
- 2.3. Lower Layer Stack Incompatibilities
-
- A requirement for successful operation of the GO-MHS Commun-
- ity is that all users can exchange messages. The GO-MHS Com-
- munity is not dependent on the traditional TCP/IP lower
- layer protocol suite. A variety of lower layer suites are
- used as carriers of X.400 messages.
-
- For example, consider Figure 1.
-
- -----------------------------------------------------
- ! !
- ! PRMD A !
- ! -------------------- !
- ! ! o x ! !
- ! ! ! !
- ! ! o w ! !
- ! ! z ! !
- ! -------------------- !
- ! PRMD B !
- ! ------------------ !
- ! ! o o ! !
- ! PRMD C ! o ! !
- ! ------------------ ! o z ! !
- ! ! o ! ! ! !
- ! ! o x ! ------------------ !
- ! ! o w ! !
- ! ! o ! !
- ! ------------------ !
- ! !
- ! Key: Each character the in !
- ! the boxes illustrates an MTA. !
- ! !
- ! x: TP0/RFC1006/TCP RELAY-MTA !
- ! w: TP4/CLNP RELAY-MTA !
- ! z: TP0/CONS/X.25 RELAY-MTA !
- ! o: MTA !
- -----------------------------------------------------
-
- Figure 1: A Deployment Scenario
-
-
- PRMD A has three RELAY-MTAs which collectively provide sup-
- port for the TP0/CONS/X.25, TP0/RFC1006, and TP4/CLNS
- stacks.[2] Thus, PRMD A is reachable via these stacks. How-
- ever, since PRMD B only supports the TP0/CONS/X.25 stack, it
- is not reachable from the TP0/RFC 1006 or the TP4/CLNS
-
-
- [2] Note: it is acceptable for a single RELAY-MTA to sup-
- port more than one stack. Three RELAY-MTAs are shown in
- this figure for clarity.
-
-
-
-
- INTERNET-DRAFT [Page 6] Exp. Date: 04/15/94
-
- stack. PRMD C supports TP0/RFC1006 and TP4/CLNS. Since PRMD
- B and PRMD C do not share a common stack, how is a message
- from PRMD C to reach a recipient in PRMD B?
-
- One solution to this problem is to require that PRMD B
- implement a stack in common with PRMD C. However this may
- not be a politically acceptable answer to PRMD B.
-
- Another solution is to implement a transport service bridge
- (TSB) between TP0/RFC 1006 in PRMD C to TP0/CONS in PRMD B.
- This will solve the problem for PRMD C and B. However, the
- lack of coordinated deployment of TSB technology makes this
- answer alone unacceptable on an international scale.
-
- The solution to this problem is to define a coordinated
- mechanism that allows PRMD B to advertise to the world that
- it has made a bilateral agreement with PRMD A to support
- reachability to PRMD B from the TP0/RFC 1006 stack.
-
- This solution does not require that every MTA or MD directly
- support all stacks. However, it is a requirement that if a
- particular stack is not directly supported by an MD, the MD
- will need to make bilateral agreements with other MD(s) in
- order to assure that connectivity from that stack is avail-
- able.
-
- Thus, in the case of Figure 1, PRMD B can make a bilateral
- agreement with PRMD A which provides for PRMD A to relay
- messages which arrive on either the TP4/CLNP stack or the
- TP0/RFC 1006 stack to PRMD B using the TP0/CONS stack.
-
- The policies described in reference [1] define this general
- purpose solution. It is a requirement that all MDs follow
- the rules and policies defined by reference [1].
-
-
-
- 3. Description of GO-MHS Community Policies
-
- A GO-MD is a Management Domain in the GO-MHS Community.
-
- The policies described in this section constitute a minimum
- set of common policies for GO-MDs. They are specified to
- ensure interoperability between
-
- - all GO-MDs.
- - all GO-MDs and the RFC-822 mail service (SMTP).
- - all GO-MDs and other X.400 service providers.
-
-
-
-
-
-
-
- INTERNET-DRAFT [Page 7] Exp. Date: 04/15/94
-
- 3.1. X.400 Address Registration
-
- An O/R address is a descriptive name for a UA that has cer-
- tain characteristics that help the Service Providers to
- locate the UA. Every O/R address is an O/R name, but not
- every O/R name is an O/R address. This is explained in
- reference [5], chapter 3.1.
-
- Uniqueness of X.400 addresses shall be used to ensure end-
- user connectivity.
-
- Mailboxes shall be addressed according to the description of
- O/R names, Form 1, Variant 1 (see reference [5], chapter
- 3.3.2). The attributes shall be regarded as a hierarchy of
-
- Country name (C)
- Administration domain name (ADMD)
- [Private domain name] (PRMD)
- [Organization name] (O)
- [Organizational Unit Names] (OUs)
- [Personal name] (PN)
- [Domain-defined attributes] (DDAs)
-
- Attributes enclosed in square brackets are optional. At
- least one of PRMD, O, OU and PN names shall be present in an
- O/R address. At least one of PN and DDA shall be present.
-
- In general a subordinate address element shall be unique
- within the scope of its immediately superior element. An
- exception is PRMD, see section 3.1.3. There shall exist
- registration authorities for each level, or mechanisms shall
- be available to ensure such uniqueness.
-
-
- 3.1.1. Country (C)
-
- The values of the top level element, Country, shall be
- defined by the set of two letter country codes, or numeric
- country codes in ISO 3166.
-
-
- 3.1.2. Administration Management Domain (ADMD)
-
- The values of the ADMD field are decided on a national
- basis. Every national decision made within the GO-MHS com-
- munity shall be supported by a GO-MD.
-
-
- 3.1.3. Private Management Domain (PRMD)
-
- The PRMD values should be unique within a country.
-
-
-
-
- INTERNET-DRAFT [Page 8] Exp. Date: 04/15/94
-
- 3.1.4. Organization (O)
-
- Organization values shall be unique within the context of
- the subscribed PRMD or ADMD if there is no PRMD. For clarif-
- ication: The following situation is legal:
-
- 1) C=FI; ADMD=FUMAIL; O=FUNET.
- 2) C=FI; ADMD=FUMAIL; PRMD=NOKIA; O=FUNET.
-
- In this case 1) and 2) are different addreses. (Note that 2)
- at this point is a hypotethical address). O=FUNET is a sub-
- scriber both at ADMD=FUMAIL, 1), and at PRMD=NOKIA, 2).
-
-
- 3.1.5. Organizational Units (OUs)
-
- If used, a unique hierarchy of OUs shall be implemented. The
- top level OU is unique within the scope of the immediately
- superior address element (i.e., Organization, PRMD or ADMD).
- Use of multiple OUs may be confusing.
-
-
- 3.1.6. Given Name, Initials, Surname (G I S)
-
- Each Organization can define its own Given-names, Initials,
- and Surnames to be used within the Organization. In the
- cases when Surnames are not unique within an O or OU, the
- Given-name and/or Initial shall be used to identify the
- Originator/Recipient. In the rare cases when more than one
- user would have the same combination of G, I, S under the
- same O and/or OUs, each organization is free to find a prac-
- tical solution, and provide the users with unique O/R
- addresses.
-
- Either one of Given-name or Initials should be used, not
- both. Periods shall not be used in Initials.
-
- To avoid problems with the mapping of the X.400 addresses to
- RFC-822 addresses, the following rules might be used. ADMD,
- PRMD, O, and OU values should consist of characters drawn
- from the alphabet (A-Z), digits (0-9), and minus. Blank or
- Space characters should be avoided. No distinction is made
- between upper and lower case. The last character shall not
- be a minus sign or period. The first character should be
- either a letter or a digit (see reference [6] and [7]).
-
-
- 3.1.7. Domain Defined Attributes (DDAs)
-
- The GO-MHS Community shall allow the use of domain defined
- attributes. Note: Support for DDAs is mandatory in the func-
- tional profiles, and all software must upgrade to support
- DDAs. The following DDAs shall be supported by a GO-MD:
-
-
- INTERNET-DRAFT [Page 9] Exp. Date: 04/15/94
-
- "RFC-822" - defined in reference [3].
-
-
- The following DDAs should be supported by a GO-MD:
-
- "COMMON" - defined in reference [2].
-
-
-
- 3.2. X.400 88 -> 84 Downgrading
-
- The requirements in reference [2] should be implemented in
- GO-MDs
-
-
- 3.3. X.400 / RFC-822 address mapping
-
- All GO-MHS Community end-users shall be reachable from all
- end-users in the RFC-822 mail service in the Internet
- (SMTP), and vice versa.
-
- The address mapping issue is split into two parts:
-
- 1) Specification of RFC-822 addresses seen from the X.400 world.
- 2) Specification of X.400 addresses seen from the RFC-822 world.
-
- The mapping of X.400 and RFC-822 addresses shall be per-
- formed according to reference [3].
-
-
- 3.3.1. Specification of RFC-822 Addresses seen from the
- X.400 World
-
- Two scenarios are described:
-
- A. The RFC-822 end-user belongs to an organization with no defined X.400
- standard attribute address space.
- B. The RFC-822 end-user belongs to an organization with a defined X.400
- standard attribute address space.
-
-
- Organizations belong to scenario B if their X.400 addresses
- are registered according to the requirements in section 3.1.
-
-
- 3.3.1.1. An Organization with a defined X.400 Address
- Space
-
- An RFC-822 address for an RFC-822 mail user in such an
- organization shall be in the same address space as a normal
- X.400 address for X.400 users in the same organization.
- RFC-822 addresses and X.400 addresses are thus sharing the
- same address space. Example:
-
-
- INTERNET-DRAFT [Page 10] Exp. Date: 04/15/94
-
- University of Wisconsin-Madison is registered under C=US;
- ADMD=Internet; PRMD=XNREN; with O=UW-Madison and they are
- using OU=cs to address end-users in the CS-department. The
- RFC-822 address for RFC-822 mail users in the same depart-
- ment is: user@cs.wisc.edu.
-
- An X.400 user in the GO-MHS Community will address the RFC-
- 822 mail user at the CS-department with the X.400 address:
-
- C=US; ADMD=Internet; PRMD=xnren; O=UW-Madison; OU=cs; S=user;
-
-
- This is the same address space as is used for X.400 end-
- users in the same department.
-
-
- 3.3.1.2. An Organization with no defined X.400 Address
- Space
-
- RFC-822 addresses shall be expressed using X.400 domain
- defined attributes. The mechanism used to define the RFC-
- 822 recipient will vary on a per-country basis.
-
- For example, in the U.S., a special PRMD named "Internet" is
- defined to facilitate the specification of RFC-822
- addresses. An X.400 user can address an RFC-822 recipient
- in the U.S. by constructing an X.400 address such as:
-
- C=us; ADMD=Internet; PRMD=Internet; DD.RFC-822=user(a)some.place.edu;
-
-
- The first part of this address:
-
- C=us; ADMD=Internet; PRMD=Internet;
-
-
- denotes the U.S. portion of the Internet community and not a
- specific "gateway". The 2nd part:
-
- DD.RFC-822=user(a)some.place.edu
-
-
- is the RFC-822 address of the RFC-822 mail user after sub-
- stitution of non-printable characters according to reference
- [3]. The RFC-822 address is placed in an X.400 Domain
- Defined Attribute of type RFC-822 (DD.RFC-822).
-
- Each country is free to choose its own method of defining
- the RFC-822 community. For example in Italy, an X.400 user
- would refer to an RFC-822 user as:
-
- C=IT; ADMD=MASTER400; DD.RFC-822=user(a)some.place.it
-
-
-
- INTERNET-DRAFT [Page 11] Exp. Date: 04/15/94
-
- In the UK, an X.400 user would refer to an RFC-822 user as:
-
- C=GB; ADMD= ; PRMD=UK.AC; O=MHS-relay; DD.RFC-822=user(a)some.place.uk
-
-
-
- 3.3.2. Specification of X.400 Addresses seen from the RFC-
- 822 World
-
- If an X.400 organization has a defined RFC-822 address
- space, RFC-822 users will be able to address X.400 reci-
- pients in RFC-822/Internet terms. This means that the
- address of the X.400 user, seen from an RFC-822 user, will
- generally be of the form:
-
- Firstname.Lastname@some.place.edu
-
-
- where the some.place.edu is a registered Internet domain.
-
- This implies the necessity of maintaining and distributing
- address mapping tables to all participating RFC-1327 gate-
- ways. The mapping tables shall be globally consistent.
- Effective mapping table coordination procedures are needed.
-
- If an organization does not have a defined RFC-822 address
- space, an escape mapping (defined in reference [3]) shall be
- used. In this case, the address of the X.400 user, seen from
- an RFC-822 user, will be of the form:
-
- "/G=Firstname/S=Lastname/O=org name/PRMD=foo/ADMD=bar/C=us/"@
- some.gateway.edu
-
-
- Note that reference [7] specifies that quoted left-hand side
- addresses must be supported and that these addresses may be
- greater than 80 characters long.
-
- This escape mapping shall also be used for X.400 addresses
- which do not map cleanly to RFC-822 addresses.
-
- It is recommended that an organization with no defined RFC-
- 822 address space, should register RFC-822 domains at the
- appropriate registration entity for such registrations. This
- will minimize the number of addresses which must use the
- escape mapping.
-
- If the escape mapping is not used, RFC-822 users will not
- see the difference between an Internet RFC-822 address and
- an address in the GO-MHS Community. For example:
-
- The X.400 address:
-
-
-
- INTERNET-DRAFT [Page 12] Exp. Date: 04/15/94
-
- C=us; ADMD=ATTMail; PRMD=CDC; O=CPG; S=Lastname; G=Firstname;
-
-
- will from an RFC-822 user look like:
-
- Firstname.Lastname@cpg.cdc.com
-
-
-
- 3.4. Routing Policy
-
- To facilitate routing in the GO-MHS Community before an
- X.500 infrastructure is deployed, the following two docu-
- ments, a RELAY-MTA document and a Domain document, are
- defined. These documents are formally defined in reference
- [1]. The use of these documents is necessary to solve the
- routing crisis that is present today. However, this is a
- temporary solution that will eventually be replaced by the
- use of X.500.
-
- The RELAY-MTA document will define the names of RELAY-MTAs
- and their associated connection data including selector
- values, NSAP addresses, supported protocol stacks, and sup-
- ported X.400 protocol version(s).
-
- Each entry in the Domain document consists of a sub-tree
- hierarchy of an X.400 address, followed by a list of MTAs
- which are willing to accept mail for the address or provide
- a relay service for it. Each MTA name will be associated
- with a priority value. Collectively, the list of MTA names
- in the Domain document make the given address reachable from
- all protocol stacks. In addition, the list of MTAs may pro-
- vide redundant paths to the address, so in this case, the
- priority value indicates the preferred path, or the pre-
- ferred order in which alternative routes should be tried.
-
- The RELAY-MTA and Domain documents are coordinated by the
- group specified in the Community document. The procedures
- for document information gathering and distribution, are for
- further study.
-
-
- 3.5. Minimum Statistics/Accounting
-
- The following are not required for all MTAs. The information
- is provided as guidelines for MTA managers. This is helpful
- for observing service use and evaluating service perfor-
- mance.
-
- This section defines the data which should be kept by each
- MTA. There are no constraints on the encoding used to store
- the data (i.e., format).
-
-
-
- INTERNET-DRAFT [Page 13] Exp. Date: 04/15/94
-
- For each message/report passing the MTA, the following
- information should be collected.
-
- The following fields should be collected.
-
- Date
- Time
- Priority
- Local MTA Name
- Size
-
-
- The following fields are conditionally collected.
-
- From MTA Name (fm)
- To MTA Name (tm)
- Delta Time (dt)
- Message-id (id)
-
- At least one of 'fm' and 'tm' should be present. If one of
- 'fm' and 'tm' is not present, 'id' should be present. If
- both 'fm' and 'tm' are present, then 'dt' indicates the
- number of minutes that the message was delayed in the MTA.
- If 'id' cannot be mapped locally because of log file for-
- mats, 'id' is not present and every message creates two
- lines: one with 'fm' empty and one with 'tm' empty. In this
- case, 'date' and 'time' in the first line represent the date
- and time the message entered the MTA. In the second line,
- they represent the date and time the message left the MTA.
-
- The following fields are optionally collected.
-
- From Domain (fd)
- To Domain (td)
-
- For route tracing, 'fd' and 'td' are useful. They represent
- X.400 OU's, O, PRMD, ADMD and C and may be supplied up to
- any level of detail.
-
-
-
- 4. Community Document
-
- For the GO-MHS community there will exist one single COMMUN-
- ITY document containing basic information as defined in
- reference [1]. First the contact information for the central
- coordination point can be found together with the addresses
- for the file server where all the documents are stored. It
- also lists network names and stacks to be used in the
- RELAY-MTA and DOMAIN documents. The GO-MHS community must
- agree on its own set of mandatory and optional networks and
- stacks.
-
-
-
- INTERNET-DRAFT [Page 14] Exp. Date: 04/15/94
-
- 5. Authors' Addresses
-
-
- Alf Hansen
- UNINETT
- Elgesetergt. 10
- Postbox 6883, Elgeseter
- N-7002 Trondheim
- Norway
-
- Phone: +47 7359 2982
- Fax: +47 7359 6450
-
- Alf.Hansen@uninett.no
- G=Alf; S=Hansen; O=uninett; P=uninett; C=no
-
- Robert Hagens
- Advanced Network & Services, Inc.
- 1875 Campus Commons Drive
- Suite 220
- Reston, VA 22091
- U.S.A.
-
- Phone: +1 703 758 7700
- Fax: +1 703 758 7717
-
- hagens@ans.net
- DDA.RFC-822=hagens(a)ans.net; P=INTERNET; C=US
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- INTERNET-DRAFT [Page 15] Exp. Date: 04/15/94
-
- References
-
- [1] U. Eppenberger, Routing Coordination for X.400 MHS-
- Services Within a Multi Protocol / Multi Network En-
- vironment, RFC 1465, May 1993.
-
-
-
- [2] S.E. Hardcastle-Kille: X.400 1988 to 1984 downgrading,
- RFC 1328, May 1992.
-
-
-
- [3] S.E. Hardcastle-Kille: Mapping between X.400(1988) /
- ISO 10021 and RFC 822, RFC 1327, May 1992.
-
-
-
- [4] C. Allan Cargille, Postmaster Convention for X.400
- Operations, IETF Internet Draft, "draft-ietf-x400ops-
- postmaster-03.txt"
-
-
-
- [5] <ref. CCITT Red Book, X.400>
-
-
-
- [6] K. Harrenstien, et al. DOD Internet Host Table Specifi-
- cation. RFC 952, October 1985.
-
-
-
- [7] R. Braden. Requirements for Internet Hosts -- Applica-
- tion and Support. RFC 1123, October 1989.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
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-
-
-
-
- INTERNET-DRAFT [Page 16] Exp. Date: 04/15/94
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-
-
-