My ip is suppose 10.23.200.11,and my network mask is 255.255.240.0.Then my Network prefix is

10.23.200.11
255.255.240.0
-----------------(bitwise and)
10.23.192.0

Is ,This is correct .Then can you tell me by giving this IP (10.23.192.0) am I able to get all the device connected to my network by using nmap as follows.

Is the above command correct,to scan all the device attach to my network under the same router,if not can you tell me how find the network address and use that to find all the device attached by nmap. I have doubt ,I got 10.23.192.1 as my default gateway(router) then I am confused what is the address I have to use to find all the device connected to the network.

I have following doubts also,kindly tell some answer to clear my fundamental networking concepts...

we are 4 friends staying in a room and have a connection from a network provider.

They given us a wireless device which get connected to a switch and from that switch we are having 4 connections.

so now when I am connected to the internet ,I have one private IP (10.23.200.11) ,my other friends also having ip like :10.23.202.12, 10.23.198.25.

But when I am searching in google what is my IP it shows 13.193.112.91.

my doubt is how this all happening and also my dhcp server IP is
something different like 13.193.12.16

what is this all, can any one kindly tell me some thing about these concepts.

What is happening from the ISP to my PC what are the stages and how the IPs are given to us.

where is the DHCP present and where is the router

what is that wireless device ,they given to us by which we are getting connection.

Thanks

Either your wireless AP device or your switch (or both) are performing NAT for you and your peers.

http://en.wikipedia.org/wiki/Network...ss_translation

You're on private (RFC 1918) IP space, and the NAT device is allowing all of you to masquerade as the publicly-routable IP 13.193.112.91.

http://en.wikipedia.org/wiki/Private_network

In effect, you can reach hosts out on the 'net through your NAT device, but they cannot reach you (except through TCP/UDP conversations you've initiated, and/or except where you've set up port forwarding explicitly).

Please read the Wikipedia articles.

As for your nmap(1) questions, please read its documentation (online or its manpages).

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hi anomie,thanks for your valuable information.

ok,Now I am using nmap with the network address to discover all the node but it showing some error as follows

1.I am trying to get all the device details of in the network as above calculation,and using nmap to do it but getting some error at a perticular IP and when I am trying to ping it ,it showing some error but when I am trying to ping my Ip it is working fine.

127.0.0.1 is not "your IP" in that sense, it is localhost. The complete 127.0.0.0/8 IP space is reserved for that and will never ever be routed by any machine. It's always the machine itself that will answer.

"nexthost: failed to determine route to 10.0.3.254" means that your network does not know any route to the specified network. You're probably trying to get somewhere completely outside your local network range.

I still fail to see the purpose behind doing all this. Could you explain what you want to do and supply some more details and basic configuration of your machines/router.

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