Buen día estimados lectores,
Muchos de ustedes llegan a mí planteando cuestiones inherentes a este tema: la propagación de los DNS…
Cuando se adquiere un nombre de dominio, por ejemplo «midominio.com», automáticamente se crea un registro en los servidores DNS dónde compraste el dominio.
Si al comprar el dominio no estableciste los dns de tu web hosting, el registrador configurará sus propios DNS como «authority DNS server», y así este sirva de referencia en todo el mundo.
Si cambias los DNS de tu dominio, luego de haberlo comprado (una vez que el registrador ha establecido sus propios DNS), este cambio puede tardar de 24 a 72hrs, así como cuando transfieres un dominio o cambias de hosting.
Es en este punto, en el que, varios – al principio, cuando no entendemos de qué se trata esto – nos sentimos frustrados al respecto.
Pasaré a explicarles, cómo funcionan los Servidores de Nombre de Dominio (DNS):
Si alguien quiere encontrar tu sitio web, desde cualquier navegador web, al enviar la petición http, se revisa cuál es el Authority DNS server y así averigüar cuál es la IP del servidor, para que así el navegador redirija correctamente del nombre de dominio a la IP real del servidor donde está alojado. Este es el principio básico de cómo se opera para servir esa web, pero … ¿Por qué se tarda tanto, cuando se realiza un cambio en la web o los DNS?
Los Servidores de nombre – para agilizar el tráfico web – hacen uso de una caché que se actualiza o refresca, en una media de 2 a 3 días, es algo que no está estandarizado.
De allí a que los cambios de DNS cuando se transfiere un dominio o se establecen los DNS en un dominio por primera vez, luego de registrarlo, incluso: cuando se crea un subdominio luego de tener las DNS registradas, tarde en actualizarse.
Les presento algunos sitios donde pueden consultar la propagacion de sus nuevos DNS:
1. Site24x7 – Verifica 43 ubicaciones en todo el mundo – se puede elegir para consultar todos o sólo algunos de ellos.
2. WhatsMyDNS – Consultas de 20 servidores en todo el mundo.
3. ViewDNS – Revisa 19 servidores en todo el mundo.
4. Ceipam – Verifica 18 servidores en todo el mundo, con opciones para comprobar una costumbre IP, y su propio servidor DNS local.
5. DNSMap – Comprueba un número de servidores en todo el mundo.
6. Preshweb – Ofrece una serie de opciones para el control de los registros DNS. Un poco fiable; algunos servidores devuelven ninguna información.
7. Mob – Verifica 26 servidores en todo el mundo
8. Nexcess – Mira a tu DNS en 22 lugares del mundo.
9. Just-Ping – Comprueba 50 ubicaciones en todo el mundo.
10. DNSUnlimited – Comprueba 13 servidores en todo el mundo.
11. PropagatedYet – siga los pasos de su dominio y la nueva IP y voy a dar un «sí» o «no» como respuesta a la pregunta: «¿Se propaga todavía?»
12. Global DNS – Verifica 50 ubicaciones en todo el mundo.
13. DNS CHecK – Verifica en 9 hubicaciones en todo el mundo
14. Global DNS Propagation checker – Verifica en 21 hubicaciones en todo el mundo
Hasta una próxima entrega.
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