How to find IPs of all machines in a lan

Hi,

How to find out the IPs of all the m/cs in a lan ?

Thanks,
Subramanya M

On 2006-05-10, (E-Mail Removed) <(E-Mail Removed)> wrote:
> Hi,
>
> How to find out the IPs of all the m/cs in a lan ?

keywords:

nmap (-sP)
arp


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On 10 May 2006 04:41:03 -0700, (E-Mail Removed)
<(E-Mail Removed)> wrote:
> Hi,
>
> How to find out the IPs of all the m/cs in a lan ?
>
Ping the broadcast address.


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On Wed, 10 May 2006 08:41:55 -0400, Bill Marcum wrote:
> On 10 May 2006 04:41:03 -0700, (E-Mail Removed)
> <(E-Mail Removed)> wrote:
>>
>> How to find out the IPs of all the m/cs in a lan ?
>>
> Ping the broadcast address.

Experience here -- and anecdotal comments seem to confirm -- Win XP
does _not_ reply to broadcast pings.

Jonesy
--
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38.24N 104.55W | @ config.com | Jonesy | OS/2
*** Killfiling google posts: <http//jonz.net/ng.htm>

On 10 May 2006, in the Usenet newsgroup comp.os.linux.networking, in article
<(E-Mail Removed) .com>, (E-Mail Removed)
wrote:

> How to find out the IPs of all the m/cs in a lan ?

]Organization: http://groups.google.com

Sigh...

1. Ask google. A search for "find IP addresses on LAN" turns up about
12,200,000 hits in less than a fifth of a second.
2. Ask the network administrator.
3. Try pinging the broadcast address (but some O/S ignore broadcast pings,
and some systems run firewalls that block ping).
4. Run a sniffer like 'tcpdump', 'sniffit', 'ethereal', etc, looking at ARP
packets - though this only finds systems that are talking.
5. Use a scanner like nmap to scan the network.
6. Write a dumb three line shell script to attempt a connection to some
port on each host address on the LAN. This only finds hosts that are
turned on.
7. Use a DNS query tool to ask the name server(s) for all hosts.
8. Review your course material and see what the instructor recommended.

Old guy

> 6. Write a dumb three line shell script to attempt a connection to
some
> port on each host address on the LAN. This only finds hosts that are
> turned on.

<snip>

It works great most of the time - along with nmap.




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Bangladesh