Ce Este Ping-ul ?

Comanda de ping (start -> run -> ping ...) este defapt un instrument de retea folosit pentru a verifica daca un anumit host poate fi accesat prin intermediul unei retele de tip IP. Ping trimte mesaje ICMP "echo request" (in romaneste solicitare de raspuns) prin pachete adresate host-ul vizat si asteapta raspunsul la aceste mesaje venite sub forma de raspunsuri ICMP "echo response" de la hostul destinatie. Transmitand periodic astfel de pachete si calculand intarzierea cu care ajung raspunsurile, ping estimeaza timpul de round-trip, precum si rata de pierdere a pachetelor dintre host-uri.

Mai jos aveti un exemplu de ping:

Quote
ping www.google.com
PING www.l.google.com (64.233.183.103) 56(84) bytes of data.
64 bytes from 64.233.183.103: icmp_seq=1 ttl=246 time=22.2 ms
64 bytes from 64.233.183.103: icmp_seq=2 ttl=245 time=25.3 ms
64 bytes from 64.233.183.103: icmp_seq=3 ttl=245 time=22.7 ms
64 bytes from 64.233.183.103: icmp_seq=4 ttl=246 time=25.6 ms
64 bytes from 64.233.183.103: icmp_seq=5 ttl=246 time=25.3 ms
64 bytes from 64.233.183.103: icmp_seq=6 ttl=245 time=25.4 ms
64 bytes from 64.233.183.103: icmp_seq=7 ttl=245 time=25.4 ms
64 bytes from 64.233.183.103: icmp_seq=8 ttl=245 time=21.8 ms
64 bytes from 64.233.183.103: icmp_seq=9 ttl=245 time=25.7 ms
64 bytes from 64.233.183.103: icmp_seq=10 ttl=246 time=21.9 ms

--- www.l.google.com ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9008ms
rtt min/avg/max/mdev = 21.896/24.187/25.718/1.619 ms