DHCP access
Marty Landman
MLandman at face2interface.com
Thu Feb 26 12:43:30 PST 2004
At 02:08 PM 2/22/2004, Olaf Hoyer wrote:
>On Sun, 22 Feb 2004, Marty Landman wrote:
>
> > So the arp cache doesn't have nodes on it which it hasn't had activity from
> > for a time?
>
>Yes.
I struck out with upgrading nmap to 3.50 as well, and wanting to learn a
little about shell scripting wrote this [doubtless poor example but I am a
newbie to unix shells] which does work on my lan - taking about 15 seconds
wall time to complete.
$ ./findIps
preparing pings
start pinging
1 is on the network
3 is on the network
7 is on the network
160 is on the network
240 is on the network
End of story
$ more findIps
#!/bin/bash
pingEm()
{
echo "preparing pings"
for((i=1;i<255;i++))
do
echo "ping -c1 192.168.0.$i > $$/$i &" >> pingEmAll.$$
done
echo "start pinging"
chmod +x pingEmAll.$$ && `./pingEmAll.$$`
}
findEm()
{
for((i=1;i<255;i++))
do
awk '/64 bytes from /' $$/$i > ans
awk '{ print length($0) }' ans > len
if [ `more len` ]
then
echo "$i is on the network"
fi
done
}
mkdir $$ && pingEm
findEm
rm -r $$ & rm pingEmAll.$$ ans len
echo End of story
$
Marty Landman Face 2 Interface Inc. 845-679-9387
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