A maioria dos PCs deve responder ao ping
$ ping -c 5 black
PING black.example.com (10.0.0.8) from 10.0.0.9 : 56(84) bytes of data.
64 bytes from black.example.com (10.0.0.8): icmp_seq=1 ttl=128 time=0.231 ms
64 bytes from black.example.com (10.0.0.8): icmp_seq=2 ttl=128 time=0.209 ms
64 bytes from black.example.com (10.0.0.8): icmp_seq=3 ttl=128 time=0.210 ms
64 bytes from black.example.com (10.0.0.8): icmp_seq=4 ttl=128 time=0.211 ms
64 bytes from black.example.com (10.0.0.8): icmp_seq=5 ttl=128 time=0.210 ms
--- black.example.com ping statistics ---
5 packets transmitted, 5 received, 0% loss, time 3999ms
rtt min/avg/max/mdev = 0.209/0.214/0.231/0.012 ms
Se eles não responderem, eu verificaria qualquer configuração de "firewall" no PC de destino.
Firewall, avançado, ICMP, "permitir solicitação icmp de entrada"
ou linha de comando
netsh firewall set icmpsetting 8 enable
(Assumindo que o PC alvo esteja executando o Windows (especificamente XP)).