DHCP access

[Marty Landman]

At 05:04 PM 2/21/2004, Chuck Swiger wrote:
>Marty Landman wrote:
>
>>looks like arp is unreliable for a canonical list of plugged in ip's. 
>>Curious about what would work.
>
>"nmap -sP 22 192.168.0.0/24" should do it

%nmap -sP 22 192.168.0.0/24

Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
Target host specification is illegal.
QUITTING!
%

I don't understand the man page though so assume it's me, not nmap.

>ping 192.168.0.255

%ping 192.168.0.255
PING 192.168.0.255 (192.168.0.255): 56 data bytes
64 bytes from 192.168.0.3: icmp_seq=0 ttl=255 time=0.964 ms
64 bytes from 192.168.0.160: icmp_seq=0 ttl=64 time=1.359 ms (DUP!)
^C

Hmm, since there are five nodes on my class c network this didn't do the 
trick either.

I wrote a quick perl script that I think works but so slowly that it's 
impractical:

%perl -e 'for(0..255) {$ip = "192.168.0.$_";$ping = `ping -c1 $ip`;print 
"$ip\n" if $ping =~ /64 bytes from/}'
192.168.0.0
192.168.0.1
192.168.0.3

.
.
.




Marty Landman   Face 2 Interface Inc 845-679-9387
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