1> Linux to Linux
Shell access : SSH (secure socket) – encrypted way
port no : 22
SSH support both SSL and TLS. In the previous technology it uses protocol telnet
Old technology : telnet and rlogin ( text base) non secure
Kerberos used with telnet for rlogin to secure the authetication.
During remote connection they share public key during first connection attempt then ask for username and password
It store “/etc/ssh/ssh_host_rsa_key.pub” of remote machine to know host file at /root/.ssh/known_hosts
symmetric Key => single key used for encryption and decrytion.
Assymetric kye => public key used for encryption and private key for decryption. Public key pass to other end and share in know_host file. This kind of technology help to prevent man_in_middle attack.
SSH confiugration file
VNC : virtual Network computing
Port no : 5900/5901
Pakage : It require vnc on source machine. It comes with RHEL DVD
System => administration => add/remove S/W => search tiverVNC => install
OPen require software
Application => internet => Tiger VNC viewer => enter remote IP and details
While getting remote access it is mandetory that remote machine should have access allow
System => preferences => Remote desktop
-Here are different option. e.g require password authentication, control etc.
-When remote connectiobn establish it show incomming connection message on remote system. When remote operator will accept it then only autual connection done
-it gives connection with current login user to remote machine.
Disconnect the remote connection :
-it generate icon at top panel when connection establish.
-right click on that icon.
-disconnect server name
2> Linux to windows
RDP ( remote Desktop Protocol)
port : 3389
Package : rdesktop
Linux has “rdesktop” untility. It is a client for remote desktop protocol ( RDP) used in number of microsoft operation system. eg. NP, vista, windows7 etc.
It do not have graphical interface. You need to execute “rdesktop” command.
Add/remove S/w => search for rdesktop => install.
#rdesktop -a 13 192.168.122.248 ———– 13(resolution)
#firstboot => this command give first boot window same comes after installtion complete to set date/time, add root user etc.
3> Windows to Linux
It require some third party application to access linux. Because windows do not have built in s/w for this.
i. Putty : command line access
ii. vncviewer : graphical
windows provide one user login at a time hence when we access windows machine remotely it disconnect remote operator access. ( ie. at destination machine.)