On Sun, 6 Nov 2005, Kwan Lowe wrote:
> > Anyone know of a command that will cause other machines on a subnet to
> > echo back their IPs and names? Obviously, this wouldn't work if you had
> > to know the names of the machines first. So it would have to be like a
> > broadcast command that used ICMP or something to cause others to answer.
> > Anyone know of such a beast? Seems like I should know this, but I don't.
>
> You can do a broadcast ping.
>
> For a /24 network:
> ping -b 192.168.8.255
>
> Or /16, etc..
> ping -b 192.168.255.255
Not on all versions of ping, it seems:
,--
| [eben@pc eben]$ ping -b 192.168.1.255
| WARNING: pinging broadcast address
| PING 192.168.1.255 (192.168.1.255) from 192.168.1.11 : 56(84) bytes of data.
| 64 bytes from 192.168.1.11: icmp_seq=1 ttl=64 time=0.039 ms
| 64 bytes from 192.168.1.11: icmp_seq=2 ttl=64 time=0.046 ms
| 64 bytes from 192.168.1.11: icmp_seq=3 ttl=64 time=0.035 ms
| 64 bytes from 192.168.1.11: icmp_seq=4 ttl=64 time=0.045 ms
| 64 bytes from 192.168.1.11: icmp_seq=5 ttl=64 time=0.043 ms
(until I killed it)
| --- 192.168.1.255 ping statistics ---
| 5 packets transmitted, 5 received, 0% loss, time 3997ms
| rtt min/avg/max/mdev = 0.035/0.041/0.046/0.008 ms
'--
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