how would i know the ip addresses of the computers that are connected to the network?

i just want to know the ip addresses of the computers that are connected to LAN. I want to do net send. what is the MSdos command to do that?

A nice handy tool called nmap (I'm sure you've heard of it) can do pretty much everything you want it to do.
To scan from 192.168.0.0 to 192.168.0.255 simply say 'nmap 192.168.0.*'.
However I'm not to sure I under stand the second part of your question. You want to do a net send in MS-DOS? Whats wrong with simply saying 'net send [host]' in the consol window?

You could use nmap to scan an IP range...

I would be all cool about it. I would run a ARP -a at hte command promt. If your already on a LAN with these guys, their Ips should be listed in your Arp table. At that point you have the IP, then you might need their Netbios Computer name. You can get this by typing nbtstat -A 192.168.1.3(or what ever the IP is). That will return the Netbios name. At this point, if both you and the target computer have messaging service enabled. You can send a net send message. Go to the command promt, type NET SEND COMPUTERNAME MESSAGE. This reminds me of when we first networked my house. My roomate wouldnt secure his box at all. So I wrote a batch file that flooded him with NET SEND Messages telling him to secure his box. It was fun...

if you are on a M$ sys, then you won't be using Dos, just the command line, non GUI interface ?

IPCONFIG to get a summary, or:
IPCONFIG /ALL for all TCP IP details, at the command line.
Win 95 uses WINIPCFG that is similar to IPCONFIG.

Or there is ARP (address resolution protocol)
this is before the host can send anything it needs to get the physical address (mac) of the of the destination host or router first. it gets info by broadcasting it's requirements on the LAN this carries on and each piece of info is stored in the ARP cache.
To view and modify the ARP cache:
> arp -a

so, every time that you telnet, ftp or ping another host, it's mac address, if it is local, or the routers mac if it is remote, is entered into the ARP cache.

arp -a or arp -g display the ARP cache
arp -d IP_addrs delete the specified entry
arp -s IP_addrs hw_addrs adds a static entry to the cache


have fun.

edit Dr toker got there first !!!! I type to damn slow, and I missed out the net send fun part !!

People

im not sure if your trying to flame me or belittle me in some vauge way. But I was just teaching my roomate how computers can be vulnerable to the simplest things. But mainly i did it because I have a LAN share folder on my network. And I have my firewall set to accept NETBIOS connections from 192.168.1.X. So if he were to become compromised, that means I could be next.

The purpose of this was purly educational. I have no maliciouse intent on my roomate.(If i did i would kick his ass) I'm really a bit unclear on the point you were trying to get across, Specialist. I dont know if your trying to insult me or not.

No if I was then you and everyone else here would know.

its not necessary to have the ip addys to do a net send. you can use the computer name which can easily be acquired by just entering 'net view' to get them all. then just copy the name without the '\\' and do 'net send comp_name whatever you want to say'.

if you MUST have the ips you can get them using arp as toker said but you must have had communication with them or:

ip.bat
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@echo off
net view >name
for /F "tokens=1 delims=\\" %XX in (name) do ping -n 1 %XX >>ip
start notepad ip
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