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- Minutes of the Terminal Server Accounting and Authentication BOF (TERMACCT)
- 23RD IETF, San Diego, CA
-
- Reported by Larry J. Blunk
-
-
- Discussion began with the distinguishing features of a Network Access
- Server (NAS). The concept of a NAS is considered to be an abstraction. For
- example, a Unix host with async ports could very well be considered a NAS.
- The difference between a NAS and a router is the notion of session based
- services which can be authenticated and authorized.
-
- It was questioned whether the Authentication, Authorization, and
- Accounting (AAA) servers would be running as separate servers or perhaps in
- the NAS itself. Again the concept of AAA servers were viewed as a logical
- abstraction. The AAA servers could indeed be separate or in fact all run
- on the same machine.
-
- Mention was made of the possibility of providing for interdomain AAA
- services. Some thought that this should be of primary concern in the
- design process. The DNS was used as example of a hierarchical domain of
- servers.
-
- Propagation of authentication information was discussed. It would be
- desirable to not have to re-authenticate the user for each service requested.
-
- There were questions asked concerning how Kerberos could be used as the
- authentication mechanism. While it would work fine for dumb terminals
- and PPP's PAP protocol, PPP's CHAP protocol presents difficulties.
-
- There was discussion of authorization and how configuration parameters
- are retrieved. Authorization needs to be kept distinct from configuration.
- Authorization information could be retrieved using a query and response
- mechanism or all at once. This is an implementation issue.
-
- The purpose of a NAS Working Group was discussed. Should it define
- the necessary standards, or use a liaison structure (similar to the Security
- Working Group)? While authentication and accounting are currently being
- addressed, there are no groups currently working on authorization. This
- is a big issue. A NAS Working Group could specify NAS specific authorization,
- but it would be desirable to make it extensible rather than limit it to
- NAS use only. Some discussion was given to providing a mechanism for a
- common user interface. It was generally agreed that this would be outside
- the scope of the group.
-
- There was some speculation that the requirements for dumb terminal access
- and framed serial line services differed substantially enough to warrant
- independent sub-groups. However, there were many who thought that
- there was enough common overlap to require a single group. The name
- NAAAG was suggested as possible acronym for the group.
-
- The consensus of the BOF was that a NAS Working Group is needed and that
- the requirements document needs to be further refined. It was also mentioned
- that those areas outside the scope of the Working Group should be defined.
- There is also need for communication and coordination with existing
- Working Groups.
-