HP-UX Reference (11i v1 00/12) - 1M System Administration Commands N-Z (vol 4)

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telnetd(1M) telnetd(1M)

If bannerﬁle is not speciﬁed, telnetd does not print a login banner.

-s This options allows users to set the BUFFERSIZE value. This options, when set,

informs telnetd the number of user bytes to concatenate before sending to TCP.

This option is set with integer values. There is no speciﬁed default.

-t Enable the TAC User ID option. The system administrator can enable the TAC User

ID option on servers designated as participating hosts by having inetd start tel-

netd

with the -t option in /etc/inetd.conf:

telnet stream tcp nowait root /usr/lbin/telnetd telnetd -t

In order for the TAC User ID option to work as speciﬁed, the system administrator

must assign to all authorized users of the option the same login name and unique user

ID (UUID) on every participating system to which they are allowed TAC User ID

access. These same UUIDs should not be assigned to non-authorized users.

Users cannot use the feature on systems where their local and remote UUIDs differ,

but they can always use the normal telnet login sequence. Also, there may be a

potential security breach where a user with one UUID may be able to gain entry to

participating systems and accounts where that UUID is assigned to someone else,

unless the above restrictions are followed.

A typical conﬁguration may consist of one or more secure front-end systems and a net-

work of participating hosts. Users who have successfully logged onto the front-end

system may telnet directly to any participating system without being prompted for

another login.

-z This option allows users to set the BUFFERTIMEOUT value. This option, when set,

informs telnetd how long it should wait before timing out and ﬂushing the con-

catenated user data to TCP. Note that the TIMEOUT value is measured in clock ticks

(10ms) and not in seconds. This option is set with integer values. There is no speciﬁed

default.

-TCP_DELAY This option allows the users to disable the TCP_NODELAY socket option. When

telnetd is invoked with this option, small writes over telnetd may concatenate

at the tcp level so that larger tcp packets are sent to the client at less frequent inter-

vals.

To conﬁgure telnetd to have a BUFFERSIZE of 100 bytes and a BUFFERTIMEOUT

of 100 ticks and the

TCP_DELAY ON, the entry in /etc/inetd.conf

would be:

telnet stream tcp nowait root /usr/lbin/telnetd telnetd -s100 \

-z100 -TCP_DELAY

DIAGNOSTICS

If any error is encountered by telnetd in establishing the connection, an error message is returned

through the connection, after which the connection is closed and the server exits. Any errors generated by

the login process or its descendents are passed through as ordinary data.

The following diagnostic messages are displayed by telnetd:

unable to allocate Telnet device

The server was unable to obtain a Telnet pseudo-terminal for use with the login process. Either

all Telnet pseudo-terminals were in use or the

telm driver has not been properly set up (see

tels(7)).

Next step: Check the Telnet pseudo driver conﬁguration of the host where

telnetd is execut-

ing.

fork: No more processes

telnetd

was unable to fork a process to handle the incoming connection.

Next step: Wait a period of time and try again. If this message persists, the server’s host may

have runaway processes that are using all the entries in the process table.

/usr/bin/login: ...

The login program could not be started via

exec*() for the reason indicated (see exec(2)).

Section 1M−−960 − 2 − HP-UX Release 11i: December 2000

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