On Sun, 6 Nov 2005, Paul M Foster 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.
>From what I hear, you used to be able to ping the broadcast address and have
every host in that subnet respond, but that must have been before my time.
Something like this might work. (Untested, though its components have been
lightly tested; use at your own risk.)
ping_subnet () {
# Usage: ping_subnet 192.168.1
# Slow, but it should work
for host in `seq 1 254` ; do
ping -c 1 "$1".$host -w 1
done | grep 'bytes from' | cut -f 4 -d ' ' | tr -d :
}
Up to someone else to provide IP addr -> hostname mapping. "host" doesn't
work for me for names in /etc/hosts .
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