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TELNET(1) BSD General Commands Manual TELNET(1)

NAME

tteellnneett - user interface to the TELNET protocol

SYNOPSIS

tteellnneett [-446688EEFFKKLLNNaaccddffrruuxxyy] [-SS tos] [-XX authtype] [-ee escapechar]

[-kk realm] [-ll user] [-nn tracefile] [-ss srcaddr] [host [port]]

DESCRIPTION

The tteellnneett command is used to communicate with another host using the TELNET protocol. If tteellnneett is invoked without the host argument, it

enters command mode, indicated by its prompt (``telnet>''). In this

mode, it accepts and executes the commands listed below. If it is invoked with arguments, it performs an ooppeenn command with those arguments. Options:

-44 Forces tteellnneett to use IPv4 addresses only.

-66 Forces tteellnneett to use IPv6 addresses only.

-88 Specifies an 8-bit data path. This causes an attempt to negoti-

ate the TELNET BINARY option on both input and output.

-EE Stops any character from being recognized as an escape character.

-FF If Kerberos V5 authentication is being used, the -FF option allows

the local credentials to be forwarded to the remote system, including any credentials that have already been forwarded into the local environment.

-KK Specifies no automatic login to the remote system.

-LL Specifies an 8-bit data path on output. This causes the BINARY

option to be negotiated on output.

-NN Prevents IP address to name lookup when destination host is given

as an IP address.

-SS tos Sets the IP type-of-service (TOS) option for the telnet connec-

tion to the value tos, which can be a numeric TOS value or, on systems that support it, a symbolic TOS name found in the /etc/iptos file.

-XX atype

Disables the atype type of authentication.

-aa Attempt automatic login. This is now the default, so this option

is ignored. Currently, this sends the user name via the USER variable of the ENVIRON option if supported by the remote system. The name used is that of the current user as returned by getlogin(2) if it agrees with the current user ID, otherwise it is the name associated with the user ID.

-cc Disables the reading of the user's .telnetrc file. (See the

ttooggggllee sskkiipprrcc command on this man page.)

-dd Sets the initial value of the ddeebbuugg toggle to TRUE.

-ee escapechar

Sets the initial tteellnneett escape character to escapechar. If escapechar is omitted, then there will be no escape character.

-ff If Kerberos V5 authentication is being used, the -ff option allows

the local credentials to be forwarded to the remote system.

-kk realm

If Kerberos authentication is being used, the -kk option requests

that tteellnneett obtain tickets for the remote host in realm realm instead of the remote host's realm, as determined by krbrealmofhost(3).

-ll user

When connecting to the remote system, if the remote system under-

stands the ENVIRON option, then user will be sent to the remote system as the value for the variable USER. This option implies

the -aa option. This option may also be used with the ooppeenn com-

mand.

-nn tracefile

Opens tracefile for recording trace information. See the sseett ttrraacceeffiillee command below.

-rr Specifies a user interface similar to rlogin(1). In this mode,

the escape character is set to the tilde (~) character, unless

modified by the -ee option.

-ss srcaddr

Set the source IP address for the tteellnneett connection to srcaddr, which can be an IP address or a host name.

-uu Forces tteellnneett to use AFUNIX addresses only (e.g., UNIX domain

sockets, accessed with a file path).

-xx Turns on encryption of the data stream if possible. This is now

the default, so this option is ignored.

-yy Suppresses encryption of the data stream.

host Indicates the official name, an alias, or the Internet address of a remote host. If host starts with a `/', tteellnneett establishes a connection to the corresponding named socket. port Indicates a port number (address of an application). If a number is not specified, the default tteellnneett port is used. When in rlogin mode, a line of the form ~. disconnects from the remote host; ~ is the tteellnneett escape character. Similarly, the line ~^Z suspends the tteellnneett session. The line ~^] escapes to the normal tteellnneett escape prompt. Once a connection has been opened, tteellnneett will attempt to enable the TELNET LINEMODE option. If this fails, then tteellnneett will revert to one of two input modes: either ``character at a time'' or ``old line by line'' depending on what the remote system supports.

When LINEMODE is enabled, character processing is done on the local sys-

tem, under the control of the remote system. When input editing or char-

acter echoing is to be disabled, the remote system will relay that infor-

mation. The remote system will also relay changes to any special charac-

ters that happen on the remote system, so that they can take effect on the local system. In ``character at a time'' mode, most text typed is immediately sent to the remote host for processing. In ``old line by line'' mode, all text is echoed locally, and (normally)

only completed lines are sent to the remote host. The ``local echo char-

acter'' (initially ``^E'') may be used to turn off and on the local echo (this would mostly be used to enter passwords without the password being echoed). If the LINEMODE option is enabled, or if the llooccaallcchhaarrss toggle is TRUE (the default for ``old line by line''; see below), the user's qquuiitt, iinnttrr, and fflluusshh characters are trapped locally, and sent as TELNET protocol sequences to the remote side. If LINEMODE has ever been enabled, then the user's ssuusspp and eeooff are also sent as TELNET protocol sequences, and qquuiitt is sent as a TELNET ABORT instead of BREAK. There are options (see ttooggggllee aauuttoofflluusshh and ttooggggllee aauuttoossyynncchh below) which cause this action to

flush subsequent output to the terminal (until the remote host acknowl-

edges the TELNET sequence) and flush previous terminal input (in the case of qquuiitt and iinnttrr). While connected to a remote host, tteellnneett command mode may be entered by

typing the tteellnneett ``escape character'' (initially ``^]''). When in com-

mand mode, the normal terminal editing conventions are available. The following tteellnneett commands are available. Only enough of each command to uniquely identify it need be typed (this is also true for arguments to the mmooddee, sseett, ttooggggllee, uunnsseett, ssllcc, eennvviirroonn, and ddiissppllaayy commands). aauutthh argument ... The auth command manipulates the information sent through the

TELNET AUTHENTICATE option. Valid arguments for the aauutthh com-

mand are: ddiissaabbllee type Disables the specified type of authentication. To obtain a list of available types, use the aauutthh ddiissaabbllee ?? command. eennaabbllee type Enables the specified type of authentication. To obtain a list of available types, use the aauutthh eennaabbllee ?? command. ssttaattuuss Lists the current status of the various types of authentication. cclloossee Close a TELNET session and return to command mode. ddiissppllaayy argument ... Displays all, or some, of the sseett and ttooggggllee values (see below). eennccrryypptt argument ... The encrypt command manipulates the information sent through the TELNET ENCRYPT option. Valid arguments for the eennccrryypptt command are: ddiissaabbllee type [iinnppuutt | oouuttppuutt] Disables the specified type of encryption. If you omit the input and output, both input and

output are disabled. To obtain a list of avail-

able types, use the eennccrryypptt ddiissaabbllee ?? command. eennaabbllee type [iinnppuutt | oouuttppuutt] Enables the specified type of encryption. If you omit input and output, both input and output are enabled. To obtain a list of available types, use the eennccrryypptt eennaabbllee ?? command.

iinnppuutt This is the same as the eennccrryypptt ssttaarrtt iinnppuutt com-

mand.

-iinnppuutt This is the same as the eennccrryypptt ssttoopp iinnppuutt com-

mand. oouuttppuutt This is the same as the eennccrryypptt ssttaarrtt oouuttppuutt command.

-oouuttppuutt This is the same as the eennccrryypptt ssttoopp oouuttppuutt com-

mand. ssttaarrtt [iinnppuutt | oouuttppuutt] Attempts to start encryption. If you omit iinnppuutt and oouuttppuutt, both input and output are enabled. To obtain a list of available types, use the eennccrryypptt eennaabbllee ?? command. ssttaattuuss Lists the current status of encryption. ssttoopp [iinnppuutt | oouuttppuutt] Stops encryption. If you omit input and output, encryption is on both input and output. ttyyppee type Sets the default type of encryption to be used

with later eennccrryypptt ssttaarrtt or eennccrryypptt ssttoopp com-

mands. eennvviirroonn arguments ... The eennvviirroonn command is used to manipulate the variables that may be sent through the TELNET ENVIRON option. The initial

set of variables is populated with the contents of the follow-

ing environment variables, if present: USER, PRINTER, DISPLAY, TERM, COLUMNS, LINES. Only the first three are exported, by default. Valid arguments for the eennvviirroonn command are: ddeeffiinnee variable [value] Define the variable variable to have a value of value. If value is empty, the value is taken from the environment variable. Any variables defined by this command are automatically exported. The value may be enclosed in single or double quotes so that tabs and spaces may be included. uunnddeeffiinnee variable

Remove variable from the list of environment vari-

ables. eexxppoorrtt variable Mark the variable variable to be exported to the remote side. uunneexxppoorrtt variable Mark the variable variable to not be exported unless explicitly asked for by the remote side. lliisstt List the current set of environment variables. Those marked with a ** will be sent automatically, other variables will only be sent if explicitly requested.

?? Prints out help information for the eennvviirroonn com-

mand.

llooggoouutt Sends the TELNET LOGOUT option to the remote side. This com-

mand is similar to a cclloossee command; however, if the remote side does not support the LOGOUT option, nothing happens. If, however, the remote side does support the LOGOUT option, this

command should cause the remote side to close the TELNET con-

nection. If the remote side also supports the concept of sus-

pending a user's session for later reattachment, the logout

argument indicates that you should terminate the session imme-

diately. mmooddee type Type is one of several options, depending on the state of the TELNET session. The remote host is asked for permission to go into the requested mode. If the remote host is capable of entering that mode, the requested mode will be entered. cchhaarraacctteerr Disable the TELNET LINEMODE option, or, if the remote side does not understand the LINEMODE option, then enter ``character at a time'' mode. lliinnee Enable the TELNET LINEMODE option, or, if the remote side does not understand the LINEMODE

option, then attempt to enter ``old-line-by-

line'' mode.

iissiigg (-iissiigg) Attempt to enable (disable) the TRAPSIG mode of

the LINEMODE option. This requires that the LINEMODE option be enabled.

eeddiitt (-eeddiitt) Attempt to enable (disable) the EDIT mode of the

LINEMODE option. This requires that the LINEMODE option be enabled.

ssooffttttaabbss (-ssooffttttaabbss)

Attempt to enable (disable) the SOFTTAB mode of the LINEMODE option. This requires that the LINEMODE option be enabled.

lliitteecchhoo (-lliitteecchhoo)

Attempt to enable (disable) the LITECHO mode of the LINEMODE option. This requires that the LINEMODE option be enabled.

?? Prints out help information for the mmooddee com-

mand.

ooppeenn host [-ll user] [[-]port]

Open a connection to the named host. If no port number is specified, tteellnneett will attempt to contact a TELNET server at the default port. The host specification may be either a host name (see hosts(5)), an Internet address specified in the ``dot notation'' (see inet(3)), or IPv6 host name or IPv6

coloned-hexadecimal addreess. The -ll option may be used to

specify the user name to be passed to the remote system via

the ENVIRON option. When connecting to a non-standard port,

tteellnneett omits any automatic initiation of TELNET options. When the port number is preceded by a minus sign, the initial option negotiation is done. After establishing a connection,

the file .telnetrc in the users home directory is opened.

Lines beginning with a # are comment lines. Blank lines are

ignored. Lines that begin without white space are the start of a machine entry. The first thing on the line is the name of the machine that is being connected to. The rest of the line, and successive lines that begin with white space are assumed to be tteellnneett commands and are processed as if they had been typed in manually to the tteellnneett command prompt. qquuiitt Close any open TELNET session and exit tteellnneett. An end of file (in command mode) will also close a session and exit. sseenndd arguments Sends one or more special character sequences to the remote host. The following are the arguments which may be specified (more than one argument may be specified at a time): aabboorrtt Sends the TELNET ABORT (Abort processes) sequence. aaoo Sends the TELNET AO (Abort Output) sequence, which should cause the remote system to flush all output from the remote system to the user's terminal. aayytt Sends the TELNET AYT (Are You There) sequence, to which the remote system may or may not choose to respond. bbrrkk Sends the TELNET BRK (Break) sequence, which may have significance to the remote system. eecc Sends the TELNET EC (Erase Character) sequence, which

should cause the remote system to erase the last char-

acter entered. eell Sends the TELNET EL (Erase Line) sequence, which

should cause the remote system to erase the line cur-

rently being entered. eeooff Sends the TELNET EOF (End Of File) sequence. eeoorr Sends the TELNET EOR (End of Record) sequence. eessccaappee Sends the current tteellnneett escape character (initially ``^''). ggaa Sends the TELNET GA (Go Ahead) sequence, which likely has no significance to the remote system. ggeettssttaattuuss If the remote side supports the TELNET STATUS command, ggeettssttaattuuss will send the subnegotiation to request that the server send its current option status. iipp Sends the TELNET IP (Interrupt Process) sequence,

which should cause the remote system to abort the cur-

rently running process. nnoopp Sends the TELNET NOP (No OPeration) sequence. ssuusspp Sends the TELNET SUSP (SUSPend process) sequence. ssyynncchh Sends the TELNET SYNCH sequence. This sequence causes the remote system to discard all previously typed (but not yet read) input. This sequence is sent as TCP urgent data (and may not work if the remote system is

a 4.2BSD system - if it doesn't work, a lower case

``r'' may be echoed on the terminal). ddoo cmd ddoonntt cmd wwiillll cmd wwoonntt cmd Sends the TELNET DO cmd sequence. Cmd can be either a decimal number between 0 and 255, or a symbolic name for a specific TELNET command. Cmd can also be either hheellpp or ?? to print out help information, including a list of known symbolic names. ?? Prints out help information for the sseenndd command. sseett argument value uunnsseett argument value

The sseett command will set any one of a number of tteellnneett vari-

ables to a specific value or to TRUE. The special value ooffff turns off the function associated with the variable, this is equivalent to using the uunnsseett command. The uunnsseett command will disable or set to FALSE any of the specified functions. The

values of variables may be interrogated with the ddiissppllaayy com-

mand. The variables which may be set or unset, but not tog-

gled, are listed here. In addition, any of the variables for the ttooggggllee command may be explicitly set or unset using the sseett and uunnsseett commands. aayytt If TELNET is in localchars mode, or LINEMODE is enabled, and the status character is typed, a TELNET AYT sequence (see sseenndd aayytt preceding) is sent to the remote host. The initial value for the ``Are You There'' character is the terminal's status character. eecchhoo This is the value (initially ``^E'') which, when in ``line by line'' mode, toggles between doing local echoing of entered characters (for normal processing), and suppressing echoing of entered characters (for entering, say, a password). eeooff If tteellnneett is operating in LINEMODE or ``old line by line'' mode, entering this character as the first character on a line will cause this character to be sent to the remote system. The initial value of the

eof character is taken to be the terminal's eeooff char-

acter. eerraassee If tteellnneett is in llooccaallcchhaarrss mode (see ttooggggllee llooccaallcchhaarrss below), aanndd if tteellnneett is operating in ``character at a time'' mode, then when this character is typed, a TELNET EC sequence (see sseenndd eecc above) is sent to the

remote system. The initial value for the erase char-

acter is taken to be the terminal's eerraassee character. eessccaappee This is the tteellnneett escape character (initially ``^['')

which causes entry into tteellnneett command mode (when con-

nected to a remote system). fflluusshhoouuttppuutt If tteellnneett is in llooccaallcchhaarrss mode (see ttooggggllee llooccaallcchhaarrss below) and the fflluusshhoouuttppuutt character is typed, a TELNET AO sequence (see sseenndd aaoo above) is sent to the

remote host. The initial value for the flush charac-

ter is taken to be the terminal's fflluusshh character. ffoorrww11 ffoorrww22 If tteellnneett is operating in LINEMODE, these are the characters that, when typed, cause partial lines to be forwarded to the remote system. The initial value for

the forwarding characters are taken from the termi-

nal's eol and eol2 characters. iinntteerrrruupptt If tteellnneett is in llooccaallcchhaarrss mode (see ttooggggllee llooccaallcchhaarrss below) and the iinntteerrrruupptt character is typed, a TELNET IP sequence (see sseenndd iipp above) is sent to the remote host. The initial value for the interrupt character is taken to be the terminal's iinnttrr character. kkiillll If tteellnneett is in llooccaallcchhaarrss mode (see ttooggggllee llooccaallcchhaarrss below), aanndd if tteellnneett is operating in ``character at a time'' mode, then when this character is typed, a TELNET EL sequence (see sseenndd eell above) is sent to the

remote system. The initial value for the kill charac-

ter is taken to be the terminal's kkiillll character. llnneexxtt If tteellnneett is operating in LINEMODE or ``old line by line'' mode, then this character is taken to be the terminal's llnneexxtt character. The initial value for the lnext character is taken to be the terminal's llnneexxtt character. qquuiitt If tteellnneett is in llooccaallcchhaarrss mode (see ttooggggllee llooccaallcchhaarrss below) and the qquuiitt character is typed, a TELNET BRK sequence (see sseenndd bbrrkk above) is sent to the remote host. The initial value for the quit character is taken to be the terminal's qquuiitt character. rreepprriinntt If tteellnneett is operating in LINEMODE or ``old line by line'' mode, then this character is taken to be the terminal's rreepprriinntt character. The initial value for the reprint character is taken to be the terminal's rreepprriinntt character.

rrllooggiinn This is the rlogin escape character. If set, the nor-

mal tteellnneett escape character is ignored unless it is preceded by this character at the beginning of a line. This character, at the beginning of a line followed by a "." closes the connection; when followed by a ^Z it suspends the tteellnneett command. The initial state is to disable the rrllooggiinn escape character.

ssttaarrtt If the TELNET TOGGLE-FLOW-CONTROL option has been

enabled, then this character is taken to be the termi-

nal's ssttaarrtt character. The initial value for the start character is taken to be the terminal's ssttaarrtt character.

ssttoopp If the TELNET TOGGLE-FLOW-CONTROL option has been

enabled, then this character is taken to be the termi-

nal's ssttoopp character. The initial value for the stop

character is taken to be the terminal's ssttoopp charac-

ter. ssuusspp If tteellnneett is in llooccaallcchhaarrss mode, or LINEMODE is enabled, and the ssuussppeenndd character is typed, a TELNET SUSP sequence (see sseenndd ssuusspp above) is sent to the

remote host. The initial value for the suspend char-

acter is taken to be the terminal's ssuussppeenndd character. ttrraacceeffiillee This is the file to which the output, caused by nneettddaattaa or ooppttiioonn tracing being TRUE, will be written.

If it is set to ``-'', then tracing information will

be written to standard output (the default). wwoorrddeerraassee If tteellnneett is operating in LINEMODE or ``old line by line'' mode, then this character is taken to be the terminal's wwoorrddeerraassee character. The initial value for the worderase character is taken to be the terminal's wwoorrddeerraassee character. ?? Displays the legal sseett (uunnsseett) commands. ooppiiee sequence challenge The ooppiiee command computes a response to the OPIE challenge. ssllcc state The ssllcc command (Set Local Characters) is used to set or change the state of the special characters when the TELNET LINEMODE option has been enabled. Special characters are characters that get mapped to TELNET commands sequences (like iipp or qquuiitt) or line editing characters (like eerraassee and kkiillll). By default, the local special characters are exported.

cchheecckk Verify the current settings for the current spe-

cial characters. The remote side is requested to send all the current special character settings, and if there are any discrepancies with the local side, the local side will switch to the remote value.

eexxppoorrtt Switch to the local defaults for the special char-

acters. The local default characters are those of the local terminal at the time when tteellnneett was started. iimmppoorrtt Switch to the remote defaults for the special characters. The remote default characters are those of the remote system at the time when the TELNET connection was established. ?? Prints out help information for the ssllcc command. ssttaattuuss Show the current status of tteellnneett. This includes the peer one is connected to, as well as the current mode. ttooggggllee arguments ... Toggle (between TRUE and FALSE) various flags that control how tteellnneett responds to events. These flags may be set explicitly to TRUE or FALSE using the sseett and uunnsseett commands listed above. More than one argument may be specified. The state of these flags may be interrogated with the ddiissppllaayy command. Valid arguments are:

aauutthhddeebbuugg Turns on debugging information for the authenti-

cation code. aauuttoofflluusshh If aauuttoofflluusshh and llooccaallcchhaarrss are both TRUE, then when the aaoo, or qquuiitt characters are recognized (and transformed into TELNET sequences; see sseett above for details), tteellnneett refuses to display any data on the user's terminal until the remote system acknowledges (via a TELNET TIMING MARK option) that it has processed those TELNET sequences. The initial value for this toggle is TRUE if the terminal user had not done an "stty noflsh", otherwise FALSE (see stty(1)). aauuttooddeeccrryypptt When the TELNET ENCRYPT option is negotiated, by default the actual encryption (decryption) of the data stream does not start automatically. The autoencrypt (autodecrypt) command states that encryption of the output (input) stream should be enabled as soon as possible. aauuttoollooggiinn If the remote side supports the TELNET AUTHENTICATION option tteellnneett attempts to use it to perform automatic authentication. If the AUTHENTICATION option is not supported, the user's login name are propagated through the TELNET ENVIRON option. This command is the same

as specifying -aa option on the ooppeenn command.

aauuttoossyynncchh If aauuttoossyynncchh and llooccaallcchhaarrss are both TRUE, then when either the iinnttrr or qquuiitt characters is typed (see sseett above for descriptions of the iinnttrr and qquuiitt characters), the resulting TELNET sequence sent is followed by the TELNET SYNCH sequence. This procedure sshhoouulldd cause the remote system to begin throwing away all previously typed input until both of the TELNET sequences have been read and acted upon. The initial value of this toggle is FALSE. bbiinnaarryy Enable or disable the TELNET BINARY option on both input and output. iinnbbiinnaarryy Enable or disable the TELNET BINARY option on input. oouuttbbiinnaarryy Enable or disable the TELNET BINARY option on output. ccrrllff If this is TRUE, then carriage returns will be

sent as . If this is FALSE, then car-

riage returns will be send as . The initial value for this toggle is FALSE. ccrrmmoodd Toggle carriage return mode. When this mode is enabled, most carriage return characters received from the remote host will be mapped into a carriage return followed by a line feed. This mode does not affect those characters typed by the user, only those received from the remote host. This mode is not very useful unless the remote host only sends carriage return, but never line feed. The initial value for this toggle is FALSE. ddeebbuugg Toggles socket level debugging (useful only to the ssuuppeerr uusseerr). The initial value for this toggle is FALSE.

eennccddeebbuugg Turns on debugging information for the encryp-

tion code. llooccaallcchhaarrss If this is TRUE, then the fflluusshh, iinntteerrrruupptt, qquuiitt, eerraassee, and kkiillll characters (see sseett above) are recognized locally, and transformed into (hopefully) appropriate TELNET control sequences (respectively aaoo, iipp, bbrrkk, eecc, and eell; see sseenndd above). The initial value for this toggle is TRUE in ``old line by line'' mode, and FALSE in ``character at a time'' mode. When the LINEMODE option is enabled, the value of llooccaallcchhaarrss is ignored, and assumed to always be TRUE. If LINEMODE has ever been enabled, then qquuiitt is sent as aabboorrtt, and eeooff and ssuussppeenndd are sent as eeooff and ssuusspp (see sseenndd above). nneettddaattaa Toggles the display of all network data (in hexadecimal format). The initial value for this toggle is FALSE.

ooppttiioonnss Toggles the display of some internal tteellnneett pro-

tocol processing (having to do with TELNET options). The initial value for this toggle is FALSE. pprreettttyydduummpp When the nneettddaattaa toggle is enabled, if pprreettttyydduummpp is enabled the output from the nneettddaattaa command will be formatted in a more user readable format. Spaces are put between each character in the output, and the beginning of any tteellnneett escape sequence is preceded by a '*' to aid in locating them. sskkiipprrcc When the skiprc toggle is TRUE, tteellnneett skips the

reading of the .telnetrc file in the users home

directory when connections are opened. The ini-

tial value for this toggle is FALSE. tteerrmmddaattaa Toggles the display of all terminal data (in hexadecimal format). The initial value for this toggle is FALSE. vveerrbboosseeeennccrryypptt When the vveerrbboosseeeennccrryypptt toggle is TRUE, tteellnneett prints out a message each time encryption is enabled or disabled. The initial value for this toggle is FALSE. ?? Displays the legal ttooggggllee commands. zz Suspend tteellnneett. This command only works when the user is using the csh(1). !! [command] Execute a single command in a subshell on the local system. If command is omitted, then an interactive subshell is invoked. ?? [command] Get help. With no arguments, tteellnneett prints a help summary.

If command is specified, tteellnneett will print the help informa-

tion for just that command. ENVIRONMENT

tteellnneett uses at least the HOME, SHELL, DISPLAY, and TERM environment vari-

ables. Other environment variables may be propagated to the other side via the TELNET ENVIRON option.

rlogin(1), rsh(1), hosts(5), nologin(5), telnetd(8)

FILES

~/.telnetrc user customized telnet startup values

HISTORY The tteellnneett command appeared in 4.2BSD. IPv6 support was added by WIDE/KAME project. NNOOTTEESS On some remote systems, echo has to be turned off manually when in ``old line by line'' mode. In ``old line by line'' mode or LINEMODE the terminal's eeooff character is only recognized (and sent to the remote system) when it is the first character on a line. BSD January 27, 2000 BSD