The Terminal Access Controller Access-Control System Plus (TACACS+) Protocol
RFC 8907

Revision differences

Document history

Date Rev. By Action
2020-09-30
18 (System)
Received changes through RFC Editor sync (created alias RFC 8907, changed title to 'The Terminal Access Controller Access-Control System Plus (TACACS+) Protocol', changed abstract to …
2020-09-30
18 (System) RFC published
2020-09-24
18 (System) RFC Editor state changed to AUTH48-DONE from AUTH48
2020-09-11
18 (System) RFC Editor state changed to AUTH48 from RFC-EDITOR
2020-04-22
18 (System) RFC Editor state changed to RFC-EDITOR from AUTH
2020-04-20
18 (System) RFC Editor state changed to AUTH from EDIT
2020-03-20
18 (System) RFC Editor state changed to EDIT
2020-03-20
18 (System) IESG state changed to RFC Ed Queue from Approved-announcement sent
2020-03-20
18 (System) Announcement was received by RFC Editor
2020-03-20
18 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-18.txt
2020-03-20
18 (System) New version approved
2020-03-20
18 (System) Request for posting confirmation emailed to previous authors: Lol Grant <lol.grant@gmail.com>, Thorsten Dahm <thorstendlux@google.com>, " dcmgash@cisco.com" <dcmgash@cisco.com>, Andrej Ota <andrej@ota.si>, David Carrel <dcarrel@viptela.com>
2020-03-20
18 dcmgash@cisco.com Uploaded new revision
2020-03-19
17 (System) IANA Action state changed to No IANA Actions from In Progress
2020-03-19
17 (System) IANA Action state changed to In Progress
2020-03-19
17 Amy Vezza IESG state changed to Approved-announcement sent from Approved-announcement to be sent
2020-03-19
17 Amy Vezza IESG has approved the document
2020-03-19
17 Amy Vezza Closed "Approve" ballot
2020-03-19
17 Amy Vezza Ballot approval text was generated
2020-03-19
17 Amy Vezza IESG state changed to Approved-announcement to be sent from IESG Evaluation::AD Followup
2020-03-19
17 Alexey Melnikov RFC Editor Note was changed
2020-03-19
17 Alexey Melnikov RFC Editor Note for ballot was generated
2020-03-19
17 Alexey Melnikov [Ballot comment]
Thank you for addressing most of my DISCUSS/comments. Only one little thing remains:

KRB5 and KRB4 need normative references.
2020-03-19
17 Alexey Melnikov [Ballot Position Update] Position for Alexey Melnikov has been changed to No Objection from Discuss
2020-03-19
17 Alexey Melnikov RFC Editor Note for ballot was generated
2020-03-18
17 Alexey Melnikov [Ballot discuss]
Thank you for addressing most of my DISCUSS/comments. Only one little thing remains:

KRB5 and KRB4 need normative references.
2020-03-18
17 Alexey Melnikov Ballot discuss text updated for Alexey Melnikov
2020-03-18
17 Alexey Melnikov
[Ballot discuss]
(I have incorporated DISCUSS portion of Alissa's DISCUSS, see DISCUSS points #7-#9)

I appreciate that this is documenting an existing protocol and I …
2020-03-18
17 Alexey Melnikov Ballot comment and discuss text updated for Alexey Melnikov
2020-03-18
17 Alexey Melnikov
[Ballot discuss]
(I have incorporated DISCUSS portion of Alissa's DISCUSS, see DISCUSS points #7-#9)

I appreciate that this is documenting an existing protocol and I …
2020-03-18
17 Alexey Melnikov Ballot discuss text updated for Alexey Melnikov
2020-03-17
17 Alexey Melnikov
[Ballot discuss]
(I have incorporated DISCUSS portion of Alissa's DISCUSS, see DISCUSS points #7-#9)

I appreciate that this is documenting an existing protocol and I …
2020-03-17
17 Alexey Melnikov Ballot discuss text updated for Alexey Melnikov
2020-02-24
17 Roman Danyliw
[Ballot comment]
Thanks for addressing my DISCUSS and COMMENT points; and finding a middle ground in this draft by documenting the as-is, but highlight the …
2020-02-24
17 Roman Danyliw Ballot comment text updated for Roman Danyliw
2020-02-24
17 Roman Danyliw
[Ballot comment]
Thanks for addressing my DISCUSS and COMMENT points; and finding a middle ground in this document by document the as-is, but highlight the …
2020-02-24
17 Roman Danyliw [Ballot Position Update] Position for Roman Danyliw has been changed to No Objection from Discuss
2020-01-27
17 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-17.txt
2020-01-27
17 (System) New version approved
2020-01-27
17 (System) Request for posting confirmation emailed to previous authors: David Carrel <dcarrel@viptela.com>, Lol Grant <lol.grant@gmail.com>, " dcmgash@cisco.com" <dcmgash@cisco.com>, Thorsten Dahm <thorstendlux@google.com>, Andrej Ota <andrej@ota.si>
2020-01-27
17 dcmgash@cisco.com Uploaded new revision
2020-01-27
16 Warren Kumari
2020-01-27 - Warren Kumari became responsible AD - email sent to WG to try rebuild state / understand where we are in the process.

[WK …
2020-01-27
16 Alissa Cooper Shepherding AD changed to Warren "Ace" Kumari
2020-01-23
16 Adam Roach [Ballot comment]
Thanks for addressing my DISCUSS points.
2020-01-23
16 Adam Roach [Ballot Position Update] Position for Adam Roach has been changed to No Objection from Discuss
2019-11-17
16 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-16.txt
2019-11-17
16 (System) New version approved
2019-11-17
16 (System) Request for posting confirmation emailed to previous authors: David Carrel <dcarrel@viptela.com>, Lol Grant <lol.grant@gmail.com>, " dcmgash@cisco.com" <dcmgash@cisco.com>, Thorsten Dahm <thorstendlux@google.com>, Andrej Ota <andrej@ota.si>
2019-11-17
16 dcmgash@cisco.com Uploaded new revision
2019-09-22
15 Barry Leiba
[Ballot comment]
Thanks for posting version -15.  It resolves my DISCUSS issues with respect to character encoding, though it adds a couple of oddities -- …
2019-09-22
15 Barry Leiba [Ballot Position Update] Position for Barry Leiba has been changed to No Objection from Discuss
2019-09-22
15 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-15.txt
2019-09-22
15 (System) New version approved
2019-09-22
15 (System) Request for posting confirmation emailed to previous authors: David Carrel <dcarrel@viptela.com>, Lol Grant <lol.grant@gmail.com>, " dcmgash@cisco.com" <dcmgash@cisco.com>, Thorsten Dahm <thorstendlux@google.com>, Andrej Ota <andrej@ota.si>
2019-09-22
15 dcmgash@cisco.com Uploaded new revision
2019-09-08
14 (System) Sub state has been changed to AD Followup from Revised ID Needed
2019-09-08
14 (System) IANA Review state changed to Version Changed - Review Needed from IANA OK - No Actions Needed
2019-09-08
14 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-14.txt
2019-09-08
14 (System) New version approved
2019-09-08
14 (System) Request for posting confirmation emailed to previous authors: David Carrel <dcarrel@viptela.com>, Lol Grant <lol.grant@gmail.com>, " dcmgash@cisco.com" <dcmgash@cisco.com>, Thorsten Dahm <thorstendlux@google.com>, Andrej Ota <andrej@ota.si>
2019-09-08
14 dcmgash@cisco.com Uploaded new revision
2019-05-16
13 Alissa Cooper
[Ballot comment]
My DISCUSS moved to Alexey's ballot. My original comment is below:

I agree with Deborah's comment, and would further suggest that the lack …
2019-05-16
13 Alissa Cooper [Ballot Position Update] Position for Alissa Cooper has been changed to No Objection from Discuss
2019-05-16
13 Alexey Melnikov
[Ballot discuss]
(I have incorporated DISCUSS portion of Alissa's DISCUSS, see DISCUSS points #7-#9)

I appreciate that this is documenting an existing protocol and I …
2019-05-16
13 Alexey Melnikov Ballot discuss text updated for Alexey Melnikov
2019-05-16
13 Amy Vezza IESG state changed to IESG Evaluation::Revised I-D Needed from IESG Evaluation
2019-05-16
13 Magnus Westerlund [Ballot Position Update] New position, No Objection, has been recorded for Magnus Westerlund
2019-05-15
13 Alexey Melnikov
[Ballot discuss]
(One small addition to my earlier comments, see new DISCUSS point 6)

I appreciate that this is documenting an existing protocol and I …
2019-05-15
13 Alexey Melnikov Ballot discuss text updated for Alexey Melnikov
2019-05-15
13 Adam Roach
[Ballot discuss]
Thanks to everyone who has worked on documenting the TACACS+ protocol
as it is used today.

I understand the desire to publish this …
2019-05-15
13 Adam Roach
[Ballot comment]

ID Nits reports:

  ** Obsolete normative reference: RFC 1334 (Obsoleted by RFC 1994)

---------------------------------------------------------------------------

§2:

>  The key words "MUST", "MUST NOT", …
2019-05-15
13 Adam Roach [Ballot Position Update] New position, Discuss, has been recorded for Adam Roach
2019-05-15
13 Barry Leiba
[Ballot discuss]
I support the DISCUSS ballots by Alexey and Roman, as well as the comments by Deborah and Alissa that more text be in …
2019-05-15
13 Barry Leiba [Ballot Position Update] New position, Discuss, has been recorded for Barry Leiba
2019-05-15
13 Warren Kumari
[Ballot comment]
I am recusing myself as I was the WG chair when this document was initially being worked on, and, for various reasons, feel …
2019-05-15
13 Warren Kumari [Ballot Position Update] New position, Recuse, has been recorded for Warren Kumari
2019-05-15
13 Suresh Krishnan
[Ballot comment]
* Section 8.1.

"IPV6 address text representation defined in RFC 4291 [RFC4291]"

I would much prefer using RFC5952 here as it tightens rules …
2019-05-15
13 Suresh Krishnan [Ballot Position Update] New position, No Objection, has been recorded for Suresh Krishnan
2019-05-15
13 Éric Vyncke
[Ballot comment]
Thanks for the work everyone has put into this document. I have some comments and some nits. I also support most of the …
2019-05-15
13 Éric Vyncke [Ballot Position Update] New position, No Objection, has been recorded for Éric Vyncke
2019-05-15
13 Roman Danyliw
[Ballot discuss]
(1) I appreciate the deliberate and thoughtful attempt in this section to enumerate the possible risks/attacks and mitigations of the protocol as is.  …
2019-05-15
13 Roman Danyliw Ballot discuss text updated for Roman Danyliw
2019-05-15
13 Roman Danyliw
[Ballot discuss]
(1) I appreciate the deliberate and thoughtful attempt in this section to enumerate the possible risks/attacks and mitigations of the protocol as is.  …
2019-05-15
13 Roman Danyliw
[Ballot comment]
(1) Editorial Nits:

** Section 10.5.3.  Typo.  s/administraots/administrators/
** Global.  Various places in the document have an extra space between the end of …
2019-05-15
13 Roman Danyliw [Ballot Position Update] New position, Discuss, has been recorded for Roman Danyliw
2019-05-15
13 Alissa Cooper
[Ballot discuss]
(1) The Gen-ART reviewer Stewart Bryant (SB) asked the following:

    TAC_PLUS_PRIV_LVL_MAX := 0x0f

    TAC_PLUS_PRIV_LVL_ROOT := 0x0f

    TAC_PLUS_PRIV_LVL_USER …
2019-05-15
13 Alissa Cooper
[Ballot comment]
I agree with Deborah's comment, and would further suggest that the lack of modern security mechanisms in this protocol needs to be called …
2019-05-15
13 Alissa Cooper [Ballot Position Update] New position, Discuss, has been recorded for Alissa Cooper
2019-05-15
13 Alexey Melnikov
[Ballot discuss]
I appreciate that this is documenting an existing protocol and I am very glad that it is being documented.
However there are several …
2019-05-15
13 Alexey Melnikov
[Ballot comment]
In 4.8:

4.8.  The TACACS+ Packet Header

  The total length of the packet body (not including the header).

In network byte order? …
2019-05-15
13 Alexey Melnikov [Ballot Position Update] New position, Discuss, has been recorded for Alexey Melnikov
2019-05-15
13 Mirja Kühlewind
[Ballot comment]
A couple of comments/question:

1) I would like to see it more explicitly mentioned in the title, abstract, and introduction that this is …
2019-05-15
13 Mirja Kühlewind [Ballot Position Update] New position, No Objection, has been recorded for Mirja Kühlewind
2019-05-15
13 Alvaro Retana
[Ballot comment]
[Procedure Nit -- This is a comments for the Shepherd/Chairs/ADs]

It would be useful to tag this document (or draft-dahm-opsawg-tacacs) as Replacing "the …
2019-05-15
13 Alvaro Retana [Ballot Position Update] New position, No Objection, has been recorded for Alvaro Retana
2019-05-14
13 Deborah Brungard
[Ballot comment]
While the status is an Informational document, not PS, I still would
prefer if earlier in the document it provided the reader with …
2019-05-14
13 Deborah Brungard Ballot comment text updated for Deborah Brungard
2019-05-14
13 Deborah Brungard
[Ballot comment]
While the status is an Informational document, not PS, I still would prefer
if earlier in the document it provided the reader with …
2019-05-14
13 Deborah Brungard [Ballot Position Update] New position, No Objection, has been recorded for Deborah Brungard
2019-05-13
13 Stewart Bryant Request for Telechat review by GENART Completed: Almost Ready. Reviewer: Stewart Bryant. Sent review to list.
2019-05-09
13 Jean Mahoney Request for Telechat review by GENART is assigned to Stewart Bryant
2019-05-09
13 Jean Mahoney Request for Telechat review by GENART is assigned to Stewart Bryant
2019-05-09
13 Jean Mahoney Closed request for Last Call review by GENART with state 'Overtaken by Events'
2019-05-06
13 Pete Resnick Assignment of request for Last Call review by GENART to Pete Resnick was rejected
2019-04-30
13 Ignas Bagdonas IESG state changed to IESG Evaluation from Waiting for AD Go-Ahead
2019-04-30
13 Amy Vezza Placed on agenda for telechat - 2019-05-16
2019-04-30
13 Ignas Bagdonas IESG state changed to Waiting for AD Go-Ahead from Waiting for Writeup
2019-04-30
13 Ignas Bagdonas Ballot has been issued
2019-04-30
13 Ignas Bagdonas [Ballot Position Update] New position, Yes, has been recorded for Ignas Bagdonas
2019-04-30
13 Ignas Bagdonas Created "Approve" ballot
2019-04-30
13 Ignas Bagdonas Ballot writeup was changed
2019-04-23
13 (System) IESG state changed to Waiting for Writeup from In Last Call
2019-04-22
13 (System) IANA Review state changed to IANA OK - No Actions Needed from IANA - Review Needed
2019-04-22
13 Amanda Baber
(Via drafts-lastcall@iana.org): IESG/Authors/WG Chairs:

The IANA Functions Operator has reviewed draft-ietf-opsawg-tacacs-13, which is currently in Last Call, and has the following comments:

We understand that …
2019-04-21
13 Joseph Salowey Request for Last Call review by SECDIR Completed: Serious Issues. Reviewer: Joseph Salowey. Sent review to list.
2019-04-17
13 Ignas Bagdonas Changed consensus to Yes from Unknown
2019-04-11
13 Tero Kivinen Request for Last Call review by SECDIR is assigned to Joseph Salowey
2019-04-11
13 Tero Kivinen Request for Last Call review by SECDIR is assigned to Joseph Salowey
2019-04-11
13 Jean Mahoney Request for Last Call review by GENART is assigned to Pete Resnick
2019-04-11
13 Jean Mahoney Request for Last Call review by GENART is assigned to Pete Resnick
2019-04-09
13 Amy Vezza IANA Review state changed to IANA - Review Needed
2019-04-09
13 Amy Vezza
The following Last Call announcement was sent out (ends 2019-04-23):

From: The IESG <iesg-secretary@ietf.org>
To: IETF-Announce <ietf-announce@ietf.org>
CC: ibagdona@gmail.com, draft-ietf-opsawg-tacacs@ietf.org, jclarke@cisco.com, opsawg-chairs@ietf.org, Joe Clarke <jclarke@cisco.com>, …
2019-04-09
13 Amy Vezza IESG state changed to In Last Call from Last Call Requested
2019-04-09
13 Ignas Bagdonas Last call was requested
2019-04-09
13 Ignas Bagdonas Last call announcement was generated
2019-04-09
13 Ignas Bagdonas Ballot approval text was generated
2019-04-09
13 Ignas Bagdonas Ballot writeup was generated
2019-04-09
13 Ignas Bagdonas IESG state changed to Last Call Requested from AD Evaluation
2019-04-04
13 Ignas Bagdonas IESG state changed to AD Evaluation from Publication Requested
2019-03-27
13 Joe Clarke
As required by RFC 4858, this is the current template for the Document
Shepherd Write-Up.

Changes are expected over time. This version is dated 24 …
2019-03-27
13 Joe Clarke Responsible AD changed to Ignas Bagdonas
2019-03-27
13 Joe Clarke IETF WG state changed to Submitted to IESG for Publication from WG Consensus: Waiting for Write-Up
2019-03-27
13 Joe Clarke IESG state changed to Publication Requested from I-D Exists
2019-03-27
13 Joe Clarke IESG process started in state Publication Requested
2019-03-27
13 Joe Clarke
As required by RFC 4858, this is the current template for the Document
Shepherd Write-Up.

Changes are expected over time. This version is dated 24 …
2019-03-27
13 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-13.txt
2019-03-27
13 (System) New version approved
2019-03-27
13 (System) Request for posting confirmation emailed to previous authors: David Carrel <dcarrel@viptela.com>, Lol Grant <lol.grant@gmail.com>, " dcmgash@cisco.com" <dcmgash@cisco.com>, Thorsten Dahm <thorstendlux@google.com>, Andrej Ota <andrej@ota.si>
2019-03-27
13 dcmgash@cisco.com Uploaded new revision
2019-03-26
12 Joe Clarke The document has a number of serious nits that should be corrected before going to IESG.  Authors have been notified.
2019-03-12
12 Joe Clarke
As required by RFC 4858, this is the current template for the Document
Shepherd Write-Up.

Changes are expected over time. This version is dated 24 …
2019-03-12
12 Joe Clarke Notification list changed to opsawg-chairs@ietf.org, Joe Clarke <jclarke@cisco.com> from opsawg-chairs@ietf.org
2019-03-12
12 Joe Clarke Document shepherd changed to Joe Clarke
2019-03-12
12 Joe Clarke Tag Revised I-D Needed - Issue raised by WG cleared.
2018-12-01
12 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-12.txt
2018-12-01
12 (System) New version approved
2018-12-01
12 (System) Request for posting confirmation emailed to previous authors: David Carrel <dcarrel@viptela.com>, Lol Grant <lol.grant@gmail.com>, " dcmgash@cisco.com" <dcmgash@cisco.com>, Thorsten Dahm <thorstendlux@google.com>, Andrej Ota <andrej@ota.si>
2018-12-01
12 dcmgash@cisco.com Uploaded new revision
2018-10-31
11 Joe Clarke Tag Revised I-D Needed - Issue raised by WG set.
2018-10-31
11 Joe Clarke IETF WG state changed to WG Consensus: Waiting for Write-Up from WG Document
2018-09-12
11 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-11.txt
2018-09-12
11 (System) New version approved
2018-09-12
11 (System) Request for posting confirmation emailed to previous authors: Lol Grant <lol.grant@gmail.com>, Andrej Ota <aota@google.com>, Thorsten Dahm <thorstendlux@google.com>, " dcmgash@cisco.com" <dcmgash@cisco.com>, opsawg-chairs@ietf.org, David Carrel <dcarrel@viptela.com>
2018-09-12
11 dcmgash@cisco.com Uploaded new revision
2018-04-14
10 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-10.txt
2018-04-14
10 (System) New version approved
2018-04-14
10 (System) Request for posting confirmation emailed to previous authors: David Carrel <dcarrel@viptela.com>, Lol Grant <lol.grant@gmail.com>, " dcmgash@cisco.com" <dcmgash@cisco.com>, Andrej Ota <aota@google.com>, Thorsten Dahm <thorstendlux@google.com>
2018-04-14
10 dcmgash@cisco.com Uploaded new revision
2018-03-21
09 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-09.txt
2018-03-21
09 (System) New version approved
2018-03-21
09 (System) Request for posting confirmation emailed to previous authors: David Carrel <dcarrel@viptela.com>, Lol Grant <lol.grant@gmail.com>, " dcmgash@cisco.com" <dcmgash@cisco.com>, Andrej Ota <aota@google.com>, Thorsten Dahm <thorstendlux@google.com>
2018-03-21
09 dcmgash@cisco.com Uploaded new revision
2018-02-19
08 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-08.txt
2018-02-19
08 (System) New version approved
2018-02-19
08 (System) Request for posting confirmation emailed to previous authors: Lol Grant <unknown-email-Lol-Grant>, Andrej Ota <aota@google.com>, Thorsten Dahm <thorstendlux@google.com>, " dcmgash@cisco.com" <dcmgash@cisco.com>, opsawg-chairs@ietf.org, David Carrel <dcarrel@viptela.com>
2018-02-19
08 dcmgash@cisco.com Uploaded new revision
2017-08-21
07 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-07.txt
2017-08-21
07 (System) New version approved
2017-08-21
07 (System) Request for posting confirmation emailed to previous authors: Andrej Ota <aota@google.com>, Lol Grant <lol@cisco.com>, Thorsten Dahm <thorstendlux@google.com>, " dcmgash@cisco.com" <dcmgash@cisco.com>, opsawg-chairs@ietf.org, David Carrel <dcarrel@viptela.com>
2017-08-21
07 dcmgash@cisco.com Uploaded new revision
2017-05-07
06 Ignas Bagdonas Notification list changed to opsawg-chairs@ietf.org from Ignas Bagdonas <ibagdona@gmail.com>, opsawg-chairs@ietf.org
2017-05-07
06 Ignas Bagdonas Notification list changed to Ignas Bagdonas <ibagdona@gmail.com>, opsawg-chairs@ietf.org from Ignas Bagdonas <ibagdona@gmail.com>
2017-05-07
06 Ignas Bagdonas Notification list changed to Ignas Bagdonas <ibagdona@gmail.com>
2017-05-07
06 Ignas Bagdonas Document shepherd changed to Ignas Bagdonas
2017-05-07
06 Ignas Bagdonas Informational as agreed during the WG acceptance consensus.
2017-05-07
06 Ignas Bagdonas Intended Status changed to Informational from None
2017-02-22
06 Henrik Levkowetz Replaced an author 'none' entry with lol@cisco.com
2017-02-18
06 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-06.txt
2017-02-18
06 (System) New version approved
2017-02-18
06 (System) Request for posting confirmation emailed to previous authors: "David Carrel" <dcarrel@viptela.com>, "Andrej Ota" <aota@google.com>, " (Unknown)" <none>, " dcmgash@cisco.com" <dcmgash@cisco.com>, "Thorsten Dahm" <thorstendlux@google.com>, opsawg-chairs@ietf.org
2017-02-18
06 dcmgash@cisco.com Uploaded new revision
2016-08-20
05 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-05.txt
2016-07-08
04 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-04.txt
2016-06-20
03 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-03.txt
2016-04-12
02 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-02.txt
2016-03-08
01 (System) This document now replaces draft-dahm-opsawg-tacacs instead of None
2016-03-08
01 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-01.txt
2015-12-16
00 dcmgash@cisco.com New version available: draft-ietf-opsawg-tacacs-00.txt