Controlando el acceso a la red.
Partimos de un ambiente familiar con un padre algo estricto (un servidor), una hija adolescente (16 años), y una conexión a internet compaginada con los estudios de 1º de BAT.
La estudiante sabe que no debe dedicar mucho tiempo al día a "charlar" con los amigos y amigas, ni a navegar por internet, sobre todo si la navegación se centra básicamente en accesos a youtube. Los estudios son su obligación actual, se pacta un horario, pero es muy fácil ceder a la tentación de estar siempre "conectada".
El ordenador de la estudiante tiene acceso a internet a través de un proxy, aunque está en la misma red que el router adsl. El acceso se podría limitar a unas horas determinadas, pero en caso de querer cambiar ese horario de forma puntual habría que cambiar las reglas en squid.conf y reiniciar el servicio. El squid da acceso a internet a otros ordenadores a través de otra interface.
Bueno al grano. La idea es sacar el ordenador de la estudiante de la red del router adsl, aunque dejándolo en la misa red física. Configurar en el ordenador que tiene el squid una interface virtual (eth0:1) en el mismo rango que el ordenador de la estudiante. El cron se encargará, a las horas pactadas, de colocar esa interface virtual del servidor en el rango del ordenador de la estudiante. Hasta aquí como si lo hubiésemos hecho desde squid.conf. Ahora viene el "es que tengo que hacer un trabajo y tengo que buscar ..." o " me tengo que conectar para preguntarle a una amiga una cosa del instituto". Bueno pues me podría conectar al servidor por ssh y "ifconfig eth0:1 tal y tal" y arreglado. Funcionaría, pero tengo que estar en casa, o en un ordenador con acceso a internet y poder ejecuar el cliente ssh. Creamos en el servidor un archivo cgi con el comando ifconfig que coloca eth0:1 visible desde el ordenador de la estudiante, y otro cgi que saque la interface de ese rango. Así desde cualquier ordenador de la red, desde internet, o incluso desde el móvil, y solo con acceder a la dirección de cualquiera de los dos cgi's se puede alterar el horario pactado, tanto para ampliarlo como para reducirlo. De esta facilidad, cuanto más tarde se entere la estudiante mejor.
Sólo una pega, el usuario www-data (el que ejecuta el cgi) tiene que tener permisos para usar ifconfig, y no se le tiene que solicitar contraseña, esto se soluciona con sudo, y añadiendo (siempre con el comando visudo) a /etc/sudoers
www-data ALL = (root) NOPASSWD: /sbin/ifconfig
La estudiante sabe que cuando llege la hora se desconectará, y ya no podrá echarle la culpa a su padre, es un proceso automatizado, y además es un horario que ambós han pactado. Ya no harán falta los continuos avisos para que desconecte, y no valdrá la tan repetida respuesta "Ya voy, ya voy". Se acabarón las desconexiones tirando del correspondiente latiguillo del switch, el merecido reproche: "No me has dejado despedirme", y la consecuente crispación. Esperemos que esta automatización relaje un poco el ambiente familar. Ya veremos el resultado, la adolescencia es tan complicada...
Sé que el método no es muy fino, y que habrá otras formas de conseguir lo mismo, pero se me ocurrió y aquí está.



Emma Goldman
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Ima Hogg
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Freedom Monument
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The Freedom Monument is a memorial, located in Riga, Latvia, in honor of soldiers killed in action during the Latvian War of Independence. modelli di curriculum pronti, albergo roccaraso it. It is considered an important symbol of the freedom, independence and sovereignty of Latvia. Unveiled in 1935, the 42-metre (138 ft) video sesso gradis, Password Hotmail Cambiare. high monument of granite, travertine and copper often serves as the focal point of public gatherings and official ceremonies. parafrasi a zacinto di ugo foscolo, foto sesso animale gratis. The sculptures and bas-reliefs of the Freedom Monument, arranged in thirteen groups, depict Latvian culture and history. culi di donna con perizoma foto, film porno matura gratis. The core of the monument is composed of tetragonal shapes on top of each other, decreasing in size towards the top, completed by a 19-metre (62 ft) modelli di curriculum pronti, Rivenditore ducati. high travertine column bearing the copper figure of Liberty lifting three gilded stars. trailer italiano epic movie, deusanio. After several contests the monument was finally built at the beginning of the 1930s according to the scheme "Shine like a star!" by Latvian sculptor Karlis Zale. sesso con animali in italia, norton antivirus 2005 ita attivazione. During World War II Latvia was annexed by the USSR and the Freedom Monument was considered for demolition, but no such move was carried out. casalinghe calde, foto di alessio cantante napoletano neomelodico. Soviet sculptor Vera Mukhina is sometimes credited with the rescue of the monument, possibly because she considered it to be of the highest artistic value. Prestito Porto Garibaldi, castellabate santa maria hotel. It remained a symbol of national independence to the general public and on 14 June 1987 about 5,000 people gathered there to commemorate the victims of the Soviet regime and to lay flowers. domanda d iscrizione affari tuoi rai, Mondo Satellite. This rally began the national independence movement and three years later the independence of Latvia was re-established.
Cretaceous
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De momento funciona.
Pues eso, que ya han pasado tres días y de momento parece que se asume, con buen rollo, que la conexión a internet dura desde las 22:00 a las 23:00 h. de forma automática y según lo pactado. De todas formas ya he tenido que conectar un par de veces, manualmente por medio del cgi, para buscar información sobre unos trabajos. Por si se le ocurría (youtube, messenger, etc..), y para no pecar de traidor, le he enseñado lo que se guarda en los logs del squid.