Re: Mapping a netwok

[Marty Landman <MLandman@face2interface.com>]

At 09:14 AM 12/24/2004, naim abu darwish wrote:

> Consider you have a network that you know nothing about. if you have
> traceroute results to and from many hosts, theoretically and map could
> be drawn to visuallise the network using common intersections.

Naim, this may or may not be helpful but I wrote this bash script a while 
ago to establish which ip's were active on my class C network:

The code is:

#!/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

++++++++++++++++++++++++++++++++++++++++++++++++

The output looks like this:

$ ./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
$

hth,

Marty


Marty Landman, Face 2 Interface Inc. 845-679-9387
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