debug_networking

# (C) 2013-01-06 Svetlana Tkachenko GPLv2 or later
#    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
#    This is free software, and you are welcome to redistribute it
#    under certain conditions; type `show c' for details.
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
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#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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For debugging, to make a unix OS user lose internet connection, run

# iptables -A OUTPUT -o eth0 -m owner --uid-owner 1002 -j DROP

To reset,

# iptables --flush