how do I check my network users on ubuntu?

Question

We are using the same network, how can I check the network users group? How can I access their machine with local ip address?

Answer 1

You have two questions.

how can I check the network users?

1. Ask your router. Usually the router's address is 192.168.0.1. You can find out yours by issuing ip route. You can normally access a webpage by typing that address in your browser. Look for DHCP or Computers there. It'll probably ask you for user and password, which depends on the router's make, but is usually admin/admin.

2. (Easier!) Probe the local ip range and display results. A tool to do that (and much more) is nmap. To list all clients on the local network you can issue nmap -F 192.168.*.*, although nmap -F 192.168.0.* is usually enough for home networks and much, much, faster. If you want to see the operating system of each computer listed, use nmap -O -F 192.168.0.* - you'll need root privileges for that.

How can I access their machine with local ip address?

As root, initiate ssh in both computers: service ssh start. Then, from your computer, issue ssh user@ip. You now have full access to that user account on that computer. You can use scp or rsync to copy files between computers, or use software like samba to share printers and much more.

Note: In order for a computer to be accessible via ssh from outside the local network, you'll need to forward port 22 on the router to that computer, and if you have a firewall enabled, add an exception as appropriate.