Remote shutdown?

[Zetoox]

Hello Is there a possible way to shutdown another computer that is connected to my network.I don`t know the IP, is there a way to get the IP address too?Thanks

[Irithori]

Possible, if:
- You have a list of MAC addresses of known machines and/or know which machine is which on arp level.
- And you have a valid account on that "other computer".
Another possibility might be to shutdown the port this "other computer" has on your switch.

Basically you would list the arp cache and see what IP the other computer has.
Another way of finding the IP is to watch for network traffic and try to match it to known PCs.

May I ask, what the motivation is?

[Zetoox]

I know the username,for example its X.

I have 2 laptops and Im just trying to learn some stuff.

Anyways.You said monitoring traffic,can you tell me more

[Irithori]

It depends on your actual network setup, what and how to do.

Do you have control over the gateway and/or switch and/or router?
For now I will assume, that the two laptops are connected over wifi to a soho accesspoint/router.
If so, then I would suggest to login to that router´s admin webinterface and look out for the network overview
or connected wlan devices.

If there are only two active leases on dhcp (yours and the other) then it shouldnt be too hard to guess the other one
Once you have the IP, try to connect.
The method o connecting depends on the capabilities and configuration of the other machine.
Is it a windows/mac/linux?
Is the appropiate daemon/service (ssh/vnc/remoteaccess/etc)
Are remote logins allowed?
Is there maybe a firewall blocking your access?

[Zetoox]

Both linux,should I use ssh?Everything is by default,nothing changed from the install.

[Irithori]

Make sure, the ssh server is installed and started on the other laptop.
The package is called openssh-server.
This should install it:

apt-get install openssh-server

Then ssh into it with
ssh X@IP_Address
With X being the remote user and the IP address of that laptop.

[Zetoox]

Ok I got the IP,whats next?

[Irithori]

see post #6

[Zetoox]

had to refresh the page.I got the mac address the Ip,but is there a way to shutdown the other laptop without openssh server in it?

[Irithori]

Without any remote login method (ssh/vnc/etc): no.

You can maybe grant/revoke the network access this machine has on the router.