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    • Review: Netdiscover, analizando la red.
    Posted on March 27th, 2007 in Linux, Reviews, Seguridad, tutoriales by Miggs

    Anoche saliste de fiesta, la ocasión se lo merecía, habías construido tu primer USB-KeyLogger. Desgraciadamente, se te fue un poco la mano con el alcohol y hoy te levantas en un lugar en el que nunca antes habías estado… Seguramente, lo primero que harás una vez levantado es mirar a tu alrededor y observar el entorno. Buscar elementos que te resulten familiares que te sirvan para hacerte una idea de donde estas y contra que es lo que te enfrentas.

    No!, no me he vuelto loco. Sin embargo la situación es similar a cuando conectas tu ordenador a una red desconocida (ya sea por cable o Wireless). Inicialmente, si tienes suerte, habrá un servidor de DHCP que te proveerá de la mínima información necesaria para poder hacer uso de la red; una ip, una mascara de red y una puerta de enlace. Sin embargo nosotros queremos saber un poco mas sobre los aquello que nos rodea. Porque?, imagínate por ejemplo que alguien esta haciendo un mitm (man in the middle attack) con ettercap…

    Pues bien, hoy os presento netdiscover. Haciendo uso del ARP (Address resolution protocol), Netdiscover localizará todos los equipos de la red devolviéndonos una relación entra la ip local y la MAC de cada equipo.

    Los que creyeseis (yo mismo hace una semana) que con broadcast un ping (ICMP echo request) es suficiente estáis equivocados. En muchas ocasiones os encontrareis que la función ping esta deshabilitada (por motivos de seguridad).

    Esta es la pagina oficial de netdiscover. También es posible que os podáis hacer con el a través de alguno de los repositorios de tu distro.

    Una vez instalado es bueno leerse el manual (man netdiscover). A groso modo estas son algunas de las opciones disponibles

    Opciones Principales:

    -i dispositivo: interfaz de red que quieres usar; eth0, eth1, wlan.

    -r rango: rango que de deseas escanear. Ex: 192.168.1.0/24 escaneara todas las ips entre 192.168.1.0 y 192.168.1.255.

    -p: modo pasivo. No infectará nada, solo escucha las peticiones ARP que lleguen a nuestro equipo (eficaz pero mas lento).

    -s time: tiempo en milisegundos entre peticiones ARP. Útil si no quieres saturar la red o no quieres ser detectado por algún IDS.

    -f: fast mode.

    Ejemplos de Uso:

    • Búsqueda de direcciones comunes en eth0

    # netdiscover -i eth0

    • Búsqueda en modo rápido de direcciones comunes en eth0 (solo la puerta de enlace)

    # netdiscover -i eth0 -f

    • Ejemplo de análisis de algunos rangos

    # netdiscover -i eth0 172.26.0.0/24
    # netdiscover -i eth0 192.168.0.0/16
    # netdiscover -i eth0 10.0.0.0/8

    • Idem que el primer ejemplo pero con un intervalo de 0.5ms (1ms por defecto)

    # netdiscover -i eth0 -s 0.5

    • Búsqueda pasiva. Solo analiza el trafico entrante. No infectará nada a la red.

    # netdiscover -i eth0 -p

    Conclusion:

    Personalmente estoy encantado con esta sencilla aplicacion. Obviamente netdiscover no tiene la potencia de otras aplicaciones como nmap, pero sin embargo “lo que hace lo hace bien” de una manera rápida y sencilla. Puede resultar muy útil en las primeras etapas del análisis de una red.

    48 Comments

    48 Responses to 'Review: Netdiscover, analizando la red.'

    1. jorge said, on December 4th, 2007 at 12:51 pm

      hola agradesco alos que an echo este tutor muy bueno y tengo una consulta y descargado netdiscover en el sistema operativo indows xp i no encuenro ninun intalador y los archivos que ay soy de texto podrian ayudarme a pogramar por favor gracias

    2. Miggs said, on December 12th, 2007 at 1:41 am

      Hola Jorge,

      Por ahora desconozco (creo que a dia de hoy no) si los creadores de netdiscover han creado una versión para windows.

      Sin embargo estoy seguro de que debe de haber alguna herramienta equivalente para Windows, y si no es hora de que alguien la haga. En principio no no es un proceso demasiado complejo.

      Suerte!

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