Nuevas características del "ping" en el IPv6 actual de XP.

Desde que se ha incorporado en Windows XP con las últimas actualizaciones la compatibilidad a IPv6, un simple:

ping nombre_de_nuestra_máquina (a la máquina local)

nos devuelve unas direcciones "raras", del tipo:

Pinging mi_máquina [::1] with 32 bytes of data:

Reply from ::1: time<1ms
Reply from ::1: time<1ms
Reply from ::1: time<1ms
Reply from ::1: time<1ms

Ping statistics for ::1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms

Bien, esto es debido a que para los comandos ya nos está respondiendo el stack de Ipv6. Aunque no está documentado en la ayuda del ping, la sintaxis completa os la deja aquí abajo.

Por tanto, para hacer un ping y que nos devuelva correctamente todo, deberíamos hacer:

ping -4 nombre_de_nuestra_máquina

Usage: ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS]
                   [-r count] [-s count] [[-j host-list] | [-k host-list]]
                   [-w timeout] [-R] [-S srcaddr] [-4] [-6] target_name

Options:

-t	Ping the specified host until stopped. To see statistics and continue - type Control-Break; To stop - type Control-C.
-a	Resolve addresses to hostnames.
-n	count Number of echo requests to send.
-l	size Send buffer size.
-f	Set Don't Fragment flag in packet (IPv4-only).
-i	TTL Time To Live.
-v	TOS Type Of Service (IPv4-only).
-r	count Record route for count hops (IPv4-only).
-s	count Timestamp for count hops (IPv4-only).
-j	host-list Loose source route along host-list (IPv4-only).
-k	host-list Strict source route along host-list (IPv4-only).
-w	timeout Timeout in milliseconds to wait for each reply.
-R	Trace round-trip path (IPv6-only).
-S	srcaddr Source address to use (IPv6-only).
-4	Force using IPv4.
-6	Force using IPv6.

--
José Manuel Tella Llop
jmtella@compuserve.com

3 - noviembre - 2003