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TELNET OPTIONS
The Telnet Protocol has a number of options that may be negotiated.
These options are listed here. "Internet Official Protocol Standards"
(STD 1) provides more detailed information.
Options Name References
------- ----------------------- ----------
0 Binary Transmission [RFC856]
1 Echo [RFC857]
2 Reconnection [NIC50005]
3 Suppress Go Ahead [RFC858]
4 Approx Message Size Negotiation [ETHERNET]
5 Status [RFC859]
6 Timing Mark [RFC860]
7 Remote Controlled Trans and Echo [RFC726]
8 Output Line Width [NIC50005]
9 Output Page Size [NIC50005]
10 Output Carriage-Return Disposition [RFC652]
11 Output Horizontal Tab Stops [RFC653]
12 Output Horizontal Tab Disposition [RFC654]
13 Output Formfeed Disposition [RFC655]
14 Output Vertical Tabstops [RFC656]
15 Output Vertical Tab Disposition [RFC657]
16 Output Linefeed Disposition [RFC657]
17 Extended ASCII [RFC698]
18 Logout [RFC727]
19 Byte Macro [RFC735]
20 Data Entry Terminal [RFC1043,RFC732]
21 SUPDUP [RFC736,RFC734]
22 SUPDUP Output [RFC749]
23 Send Location [RFC779]
24 Terminal Type [RFC1091]
25 End of Record [RFC885]
26 TACACS User Identification [RFC927]
27 Output Marking [RFC933]
28 Terminal Location Number [RFC946]
29 Telnet 3270 Regime [RFC1041]
30 X.3 PAD [RFC1053]
31 Negotiate About Window Size [RFC1073]
32 Terminal Speed [RFC1079]
33 Remote Flow Control [RFC1372]
34 Linemode [RFC1184]
35 X Display Location [RFC1096]
36 Environment Option [RFC1408]
37 Authentication Option [RFC1416]
38 Encryption Option [Borman]
39 New Environment Option [RFC1572]
40 TN3270E [RFC1647]
41 XAUTH [Earhart]
42 CHARSET [RFC2066]
43 Telnet Remote Serial Port (RSP) [Barnes]
44 Com Port Control Option [RFC2217]
45 Telnet Suppress Local Echo [Atmar]
46 Telnet Start TLS [Boe]
47 KERMIT [Altman]
48 SEND-URL [Croft]
138 TELOPT PRAGMA LOGON [McGregory]
139 TELOPT SSPI LOGON [McGregory]
140 TELOPT PRAGMA HEARTBEAT [McGregory]
255 Extended-Options-List [RFC861]
Telnet Authentication Types (Option 37)
In [RFC1416], a list of authentication types is introduced. Additions
to the list are registerd by the IANA and documented here.
Type Description Reference
0 NULL [RFC1416]
1 KERBEROS_V4 [RFC1416]
2 KERBEROS_V5 [RFC1416]
3 SPX [RFC1416]
4 MINK - reported by Altman [Unknown]
5 SRP [Wu]
6 RSA [RFC1416]
##### 6 also used by SRA ???? #####
7 SSL [Hudson]
8-9 Unassigned [IANA]
10 LOKI [RFC1416]
11 SSA [Schoch]
12 KEA_SJ [Horting]
13 KEA_SJ_INTEG [Horting]
14 DSS [Horting]
15 NTLM [Kahn]
In [RFC 1411], on the KERBEROS_V4 Telnet Authentication type there are
a set of Suboption Commands. Additions to the list are registerd by
the IANA and documented here.
Suboption Command Reference
0 AUTH [RFC1411]
1 REJECT [RFC1411]
2 ACCEPT [RFC1411]
3 CHALLENGE [RFC1411]
4 RESPONSE [RFC1411]
5 FORWARD [Brashear]
6 FORWARD-ACCEPT [Brashear]
7 FORWARD-REJECT [Brashear]
8 EXP [Wu]
9 PARAMS [Wu]
Telnet Encryption Types (Option 38)
In the Telnet Encryption types [Borman] there have been various
implementations in several widely distributed versions of Telnet
(e.g., at MIT, Stanford, and Columbia). Originally, only two
encryption types were specified. Additional encryption types have
been defined and are listed below. Additions to the list are
registerd by the IANA and documented here.
Type
1 ENCTYPE_DES_CFP64 [Ts'o]
2 ENCTYPE_DES_OFP64 [Ts'o]
3-7 Unassigned [IANA]
8 ENCTYPE_CAST5_40_CFB64 [Wu]
9 ENCTYPE_CAST5_40_OFB64 [Wu]
10 ENCTYPE_CAST128_CFB64 [Wu]
11 ENCTYPE_CAST128_OFB64 [Wu]
REFERENCES
[ETHERNET] "The Ethernet, A Local Area Network: Data Link Layer and
Physical Layer Specification", AA-K759B-TK, Digital
Equipment Corporation, Maynard, MA. Also as: "The
Ethernet - A Local Area Network", Version 1.0, Digital
Equipment Corporation, Intel Corporation, Xerox
Corporation, September 1980. And: "The Ethernet, A Local
Area Network: Data Link Layer and Physical Layer
Specifications", Digital, Intel and Xerox, November 1982.
And: XEROX, "The Ethernet, A Local Area Network: Data Link
Layer and Physical Layer Specification", X3T51/80-50, Xerox
Corporation, Stamford, CT., October 1980.
[NIC50005] DDN Protocol Handbook, "Telnet Reconnection Option",
"Telnet Output Line Width Option", "Telnet Output Page Size
Option", NIC 50005, December 1985.
[RFC652] Crocker, D., "Telnet Output Carriage-Return Disposition
Option", RFC 652, UCLA-NMC, October 1974.
[RFC653] Crocker, D., "Telnet Output Horizontal Tabstops Option",
RFC 653, UCLA-NMC, October 1974.
[RFC654] Crocker, D., "Telnet Output Horizontal Tab Disposition
Option", RFC 654, UCLA-NMC, October 1974.
[RFC655] Crocker, D., "Telnet Output Formfeed Disposition Option",
RFC 655, UCLA-NMC, October 1974.
[RFC656] Crocker, D., "Telnet Output Vertical Tabstops Option",
RFC 656, UCLA-NMC, October 1974.
[RFC657] Crocker, D., "Telnet Output Vertical Tab Disposition Option",
RFC 657, UCLA-NMC, October 1974.
[RFC658] Crocker, D., "Telnet Output Linefeed Disposition", RFC 658,
UCLA-NMC, October 1974.
[RFC698] Tovar, "Telnet Extended ASCII Option", RFC 698, Stanford
University-AI, July 1975.
[RFC726] Postel, J. and D. Crocker, "Remote Controlled Transmission
and Echoing Telnet Option", RFC 726, SRI-ARC, UC Irvine,
March 1977.
[RFC727] Crispin, M., "Telnet Logout Option", RFC 727, Stanford
University-AI, April 1977.
[RFC734] Crispin, M., "SUPDUP Protocol", RFC 734, Stanford,
October 1977.
[RFC735] Crocker, D. and R. Gumpertz, "Revised Telnet Byte Marco
Option", RFC 735, Rand, CMU, November 1977.
[RFC736] Crispin, M., "Telnet SUPDUP Option", Stanford University-AI,
RFC 736, Stanford, October 1977.
[RFC749] Greenberg, B., "Telnet SUPDUP-OUTPUT Option", RFC 749,
MIT-Multics, September 1978.
[RFC779] Killian, E., "Telnet Send-Location Option", RFC 779,
LLL, April 1981.
[RFC856] Postel, J. and J. Reynolds, "Telnet Binary Transmission",
STD 27, RFC 856, USC/Information Sciences Institute, May
1983.
[RFC857] Postel, J. and J. Reynolds, "Telnet Echo Option", STD 28, RFC
857, USC/Information Sciences Institute, May 1983.
[RFC858] Postel, J. and J. Reynolds, "Telnet Suppress Go Ahead
Option", STD 29, RFC 858, USC/Information Sciences Institute,
May 1983.
[RFC859] Postel, J. and J. Reynolds, "Telnet Status Option", STD 30,
RFC 859, USC/Information Sciences Institute, May 1983.
[RFC860] Postel, J. and J. Reynolds, "Telnet Timing Mark Option",
STD 31, RFC 860, USC/Information Sciences Institute, May
1983.
[RFC861] Postel, J. and J. Reynolds, "Telnet Extended Options - List
Option", STD 32, RFC 861, USC/Information Sciences Institute,
May 1983.
[RFC885] Postel, J., "Telnet End of Record Option", RFC 885,
USC/Information Sciences Institute, December 1983.
[RFC927] Anderson, B., "TACACS User Identification Telnet Option",
RFC 927, BBN, December 1984.
[RFC933] Silverman, S., "Output Marking Telnet Option", RFC 933,
MITRE, January 1985.
[RFC946] Nedved, R., "Telnet Terminal Location Number Option",
RFC 946, Carnegie-Mellon University, May 1985.
[RDC1041] Rekhter, J., "Telnet 3270 Regime Option", RFC 1041,
IBM, January 1988.
[RFC1043] Yasuda, A., and T. Thompson, "TELNET Data Entry Terminal
Option DODIIS Implementation", RFC 1043, DIA, February 1988.
[RFC1053] Levy, S., and T. Jacobson, "Telnet X.3 PAD Option",
RFC 1053, Minnesota Supercomputer Center, April 1988.
[RFC1073] Waitzman, D., "Telnet Window Size Option", RFC 1073,
BBN STC, October, 1988.
[RFC1079] Hedrick, C., "Telnet Terminal Speed Option", RFC 1079,
Rutgers University, December 1988.
[RFC1091] VanBokkelen, J., "Telnet Terminal Type Option",
RFC 1091, FTP Software, Inc., February 1989.
[RFC1096] Marcy, G., "Telnet X Display Location Option", RFC 1096,
Carnegie Mellon University, March 1989.
[RFC1184] Borman, D., Editor, "Telnet Linemode Option",
RFC 1184, Cray Research, Inc., October 1990.
[RFC1372] Hedrick, C., and D. Borman, "Telnet Remote Flow Control
Option", RFC 1372, Rutgers University, Cray Research, Inc.,
October 1992.
[RFC1408] Borman, D., Editor, "Telnet Environment Option", RFC 1408,
Cray Research, Inc., January 1993.
[RFC1411] Borman, D., Editor, "Telnet Authentication: Kerberos
Version 4", RFC 1411, Cray Research, Inc., January 1993.
[RFC1416] Borman, D., Editor, "Telnet Authentication Option", RFC
1416, Cray Research, Inc., February 1993.
[RFC1572] Alexander, S., Editor, "Telnet Environment Option", RFC1572,
Lachman Technology, Inc., January 1994.
[RFC1647] Kelly, B., "TN3270 Enhancements", RFC1647, Auburn
University, July 1994.
[RFC2066] Gellens, R., "Telnet CharSet Option", RFC 2066, Unisys,
January 1997.
[RFC2217] Clark, G., "Telnet Com Port Control Option", RFC 2217,
Cisco Systems, Inc., October 1997.
PEOPLE
[Altman] Jeffrey Altman, <jaltman@watsun.cc.columbia.edu>, August 1998.
[Atmar] Wirt Atmar, <atmar@aics-research.com>, June 1998.
[Barnes] Robert Barnes, <rab@stallion.oz.au>, July 1997.
[Boe] Michael Boe, <mboe@cisco.com>, June 1998.
[Brashear] Derrick Brashear, <shadow@dementia.org>, January 1995.
[Borman] Dave Borman, <dab@CRAY.COM>, January 1995.
[Croft] David Croft, <david@infotrek.co.uk>, September 1998.
[Earhart] Rob Earhart, <earhart+@CMU.EDU>, April 1995.
[Horting] Todd Horting <thorting@spyrus.com>, April 1998.
[Hudson] Tim Hudson <tjh@cryptsoft.com>, December 1998.
[IANA] Internet Assigned Numbers Authority, <iana@isi.edu>, January 1995.
[Kahn] Louis Kahn, <louisk@microsoft.com>, October 1998.
[McGregory] Steve McGregory <stevemc@pragmasys.com>, December 1998.
[Schoch] Steven Schoch, <schoch@sheba.arc.nasa.gov>, January 1995.
[Ts'o] Theodore Ts'o, <tytso@mit.edu>, September 1998.
[Wu] Thomas Wu, <tjw@stanford.edu>, July 1997, September 1998.
[]
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