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1) I believe Fedora Core has a built-in firewall (which is probably like a frontend to IPtables or something) which is probably good enough for most needs. If you want a highly-tuned or completely customized one, you may want to look into running IPtables from a command-line interface.
2) If you make a regular user account (one that cannot become root without a proper password) then that should be good for your needs. A regular user gets his/her own directory located at /home/username, and he/she usually only has access to that directory (though they may evidently create as many subdirectories as they wish) unless you explicitly change that situation (by chmodding certain folders to less restrictive permission settings-- you should generally NOT do that) -- otherwise that person will not be able to access most system files without a password, and hence will not be able to install software, except to local folders, and even then, they won't have access to the RPM database making it a real hassle to do so.
I believe you can create a user in Fedora by using 'redhat-config-users' which can probably be accessed from your menu (otherwise type 'redhat-config-users' in a terminal).
Is there a way I can make it so to download something, the user has to enter a password. The problem I'm having is that I need to make another acount, but everybody that goes on it downloads games and stuff without my permission.
I own this computer. My brother wants to use it. Every time he uses it, a whole bunch of programs, games, etc. get dowloaded onto my computer. I don't really want to kick him off and not let him on because of that (though I will if I have no other choice). So, I need a way that he can go on, but he can't do anything that will harm the system without a password that I make.
Yes, I tried asking him not to, but he didn't listen (he has problems with listening to people...), and I don't want to be mean and not let him use it. I am dual booting, and I have been making him use windows, but he messed up windows so bad, I can't do anything on it. He jammed it up with all sorts of stuff. If I even try to go on the internet, to go to google, I have to type 'g' then wait 10 seconds, then type 'o' then wait more, then type 'o' and wait more, then type 'g' then wait more, and so on............. I don't know what to do..... I don't know how to fix the windows one, and I was planning on just deleting it and having just fedora, but I am afraid he will do the same thing. If I have to, I will just not let him go on at all, unless I'm sitting there watching him. As you can probably already tell, he is not too smart, and not letting him on would probably make him feel bad. He doesnt really have the brain capacity to understand what he is doing, so I want to make an account where he can't do on fedora what he did on windows.
Simple: don't give him the root password, and give him a regular user account. He won't be able to do squat outside his home directory. And if he begs for it, too bad. Even if he did get it, he probably wouldn't be able to figure out how to load programs onto it anyway. Since you're using Fedora (ugh) most `games' and `junk' that he would want to put on would require dependencies. So... yeah, just don't give him the root password if you're still worried, but generally, a Fedora machine wouldn't be easy for him to mess with.
He'll still be able to waste your bandwidth though. You could put quota limits on his home directory I guess... but don't ask me how, I've never done it myself. Requires kernel reconfiguration and userland software as well.