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Date: Thu, 26 Feb 2004 15:43:19 -0500
To: Olaf Hoyer <ohoyer@gaff.hhhr.ision.net>
From: Marty Landman <MLandman@face2interface.com>
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cc: FreeBSD Questions <questions@freebsd.org>
Subject: Re: DHCP access
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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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