06-24-2010
how to prevent a user from downloading on lan
hi all,
i want to prevent users downloading files in the office as bandwidth becomes very low
and affects work.
one of my friend tried to close the connection using ethercap but this does not work.
i have a debian desktop while other users use MS W!ndows.
Please provide any help. Thanks
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CHFN(1) User Commands CHFN(1)
NAME
chfn - change real user name and information
SYNOPSIS
chfn [options] [LOGIN]
DESCRIPTION
The chfn command changes user fullname, office room number, office phone number, and home phone number information for a user's account.
This information is typically printed by finger(1) and similar programs. A normal user may only change the fields for her own account,
subject to the restrictions in /etc/login.defs. (The default configuration is to prevent users from changing their fullname.) The superuser
may change any field for any account. Additionally, only the superuser may use the -o option to change the undefined portions of the GECOS
field.
These fields must not contain any colons. Except for the other field, they should not contain any comma or equal sign. It is also
recommended to avoid non-US-ASCII characters, but this is only enforced for the phone numbers. The other field is used to store accounting
information used by other applications.
OPTIONS
The options which apply to the chfn command are:
-f, --full-name FULL_NAME
Change the user's full name.
-h, --home-phone HOME_PHONE
Change the user's home phone number.
-o, --other OTHER
Change the user's other GECOS information. This field is used to store accounting information used by other applications, and can be
changed only by a superuser.
-r, --room ROOM_NUMBER
Change the user's room number.
-R, --root CHROOT_DIR
Apply changes in the CHROOT_DIR directory and use the configuration files from the CHROOT_DIR directory.
-u, --help
Display help message and exit.
-w, --work-phone WORK_PHONE
Change the user's office phone number.
If none of the options are selected, chfn operates in an interactive fashion, prompting the user with the current values for all of the
fields. Enter the new value to change the field, or leave the line blank to use the current value. The current value is displayed between a
pair of [ ] marks. Without options, chfn prompts for the current user account.
CONFIGURATION
The following configuration variables in /etc/login.defs change the behavior of this tool:
CHFN_RESTRICT (string)
This parameter specifies which values in the gecos field of the /etc/passwd file may be changed by regular users using the chfn
program. It can be any combination of letters f, r, w, h, for Full name, Room number, Work phone, and Home phone, respectively. For
backward compatibility, yes is equivalent to rwh and no is equivalent to frwh. If not specified, only the superuser can make any
changes. The most restrictive setting is better achieved by not installing chfn SUID.
FILES
/etc/login.defs
Shadow password suite configuration.
/etc/passwd
User account information.
SEE ALSO
chsh(1), login.defs(5), passwd(5).
shadow-utils 4.5 01/25/2018 CHFN(1)