shell permission

[kirthi]

I am using Ubuntu 10.04 lucid lynx. Is it possible for others to access my system's login through the shell if they know the host of my system? If yes, I want to know how. And should I give permissions for them to access my system.
Thanks in Advance.

[yota]

SSH is the swiss army knife for remote login to a machine.

Start from here.

[karlson]

I am using Ubuntu 10.04 lucid lynx. Is it possible for others to access my system's login through the shell if they know the host of my system? If yes, I want to know how. And should I give permissions for them to access my system.
Thanks in Advance.

I think you should start from the top. Do you want for people to access your system?

[CharlesA]

I think you should start from the top. Do you want for people to access your system?

This ^. Also, note that installing SSH while having a weak password is one of the best ways to get your box cracked.

[dozycat]

I will add are you inside a network behind a nat with ip public?

[conradin]

I take it you want to prevent poeple from getting in.
first step would be to configure the firewall, and my yourself invisible,
by dropping packets unsolicited.
https://help.ubuntu.com/10.04/server.../firewall.html

[kirthi]

I want to know if linux can give the permission for others to access my system if they know my host through any commands in terminal.

[CharlesA]

I want to know if linux can give the permission for others to access my system if they know my host through any commands in terminal.

They'd need to know your username and password to get in.

[karlson]

I want to know if linux can give the permission for others to access my system if they know my host through any commands in terminal.

They'd need to know your username and password to get in.

Depends on what is configured and how it is configured and what type of access you want to prevent.

For remote access most commonly used now is:

SSH

You also have:

RSH
RLOGIN
TELNET

There are some more obscure that I won't mention, but again you need to specify what is it that you want to let the users do or prevent them from doing.

Any computer connected to the network is at risk. Can this be minimized? Absolutely.

[kirthi]

I want to know if something can be done to access my system by others.
Using ssh by knowing my host can they access my system. If they can do that will they be able to handle my system without my permission.