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Averia ESNIC : incompetencia y tomadura de pelo

Ayer martes 29 hubo una avería que afectaba a todos los dominios .es correspondientes al territorio español. Esnic, la entidad responsable de estos dominios publica una nota aclaratoria en la que achaca la averia a un “fallo de software”. Haciendo un poco de analisis técnico, averiguo cuales son los servidores que dan este servicio y encuentro nada menos que 4 servidores de nombre activos:

ns1.nic.es (194.69.254.1)
ineco.nic.es (194.69.254.2)
ns1.red.es (194.69.254.3)
ns2.red.es (194.69.254.4)

Usando cualquiera de ellos para resolver un .es debería funcionar, de hecho ahora mismo funciona. La cuestión es, cómo han hecho para que no funcione ninguno de los 4? Un fallo de software? El software es el mismo de siempre, no? Si lo han actualizado lo han hecho sin comprobar que funcionaba la actualización? Y 2 horas en restaurar el servicio? Señores, hacen ustedes copias de seguridad?

Ya que estaba decidí investigar un poco más como está montado el esnic. Respuesta: Fatal. Nombres que no tienen resolucion inversa, www.nic.es resuelve a 194.69.254.54 pero esa IP no resuelve a nada. También tienen IPs que resuelven a nombres antiguos, 194.69.254.5 resuelve a ns2.nic.es cuando la dirección de este es 194.69.254.38.

Leyendo en otros foros, todo el mundo se pregunta como es que no hay un sistema de contingencia automático. Yo me pregunto lo mismo ya que para el correo si que lo tienen (el correo de ellos claro) Viendo los registros mx de nic.es nos encontramos:

# host -t mx nic.es
nic.es mail is handled by 10 correo.red.es.
nic.es mail is handled by 20 relay.idatahouse.com.
nic.es mail is handled by 30 relay2.idatahouse.com.
nic.es mail is handled by 40 chico.rediris.es.
4 servidores, anda que se van a quedar sin correo, eso si, si dejan a los .es sin servicio no pasa absolutamente nada. También destacar como divertido lo bien puesto que se ponen a la hora de dar explicaciones técnicas explicando lo que es un dominio, un dns o la caché… de vergüenza…

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Archivado en : Internet
Por jorge
El 30 de Enero de 2006
A las 5:40 pm

Prevenir Hotlinking

Hotlinking, inline linking o leeching es poner el enlace de una página en otra distinta, normalmente una imagen. Esto suelen hacerlo mucho los blogs. www.bestial.org no lo hace, en su lugar el webmaster hace una copia de la imagen y la sube al servidor de bestial de forma que la copia esta en el servidor local en vez de robar ancho de banda al servidor de donde saca la foto. Si tienes un servidor y la gente enlaza directamente a tus imagenes o ficheros y quieres evitarlo aquí te pongo un sencillo truco para ello. Asumimos que usas apache y tienes el modulo mod_rewrite instalado. Creamos un fichero que se llame .htaccess con el siguiente contenido:

RewriteCond %{HTTP_REFERER} !^$RewriteCond %{HTTP_REFERER} !^http://(www.)?midominio.com/.*$ [NC]RewriteRule .(gif|jpg)$ - [F]

Eso hara que cuando hagan hotlink a una imagen de tu servidor la imagen de un error. Si en vez de eso quieres que envíe siempre la misma imagen substituye la línea RewriteRule por esta otra:

RewriteRule .(gif|jpg)$ http://www.midominio.com/imagenfija.jpg [R,L]

Esta iniciativa la he tomado porque hay muchas personas que han cogido la imagen que tenía en un chiste acerca de las personas que estan pidiendote todo el tiempo ayuda con el ordenador. He encontrado miles de accesos a la imagen y luego resulta que la mayoría ni siquiera tiene un enlace a mi web. Asi que ya sabes, si quieres una imagen de mi servidor, cógela, pero no hagas hotlinking porque te puedes llevar una desagradable sorpresa.

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Archivado en : Internet
Por jorge
El 4 de Enero de 2006
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Averia ESNIC : incompetencia y tomadura de pelo

Prevenir Hotlinking

Firefox no es un zorro