Re: Couple questions

[Paul Johnson <>]

Nathan Ensz wrote:
> You do realize that I'll probably have lots of questions for time to 
> come, right?  I appreciate you helping me out.  Okay, so question 1 is 
> this.  I figured I'd play around with the ssh stuff a bit to see how 
> that all worked out.  Is it my understanding that it is used to connect 
> to server space I have such as my username at people.ku.edu?  I was able 
> to successfully connect to my server space there and navigate it.  So I 
> guess have 2 questions in regards to this one question.  I have no 
> problems typing in a terminal, but someday someone I talk to may ask if 
> there is a GUI point and click version of ssh?  Or is that simply gFTP?  
> Second question on this is do you know what would be keeping me from 
> logging onto my servers with sunflower?  Do I need to designate places 
> I'm allowed to ssh to?  Here is the message I'm getting...
ssh is a secure shell, basically a safe version of telnet.  Use it to go 
somewhere else and run programs on that other system.

Use ssh to go to your account on a system that has an IP number or a 
registered name.  nathaens_AT_people.cc.ku.edu works because 
"people.cc.ku.edu" is a registered name. If their name was not 
registered, you would need the IP number, which you can get from typing 
"ping people.cc.ku.edu"

ON any server that offers ssh connections, you can try to log on. Once 
you are in there, you can run programs, and if they are GUI programs, 
they MIGHT get "projected back" to your computer.  I say MIGHT because 
your security settings might block you.

I can show you in the lab. You can sit at one machine, log into another, 
and run Emacs and R on that other machine.  My long term vision was that 
people would be able to do that from anywhere in the building and from 
any kind of computer (even windows).  But I think that guy who is going 
to configure the color printer will be handling it.

If you had a computer with a registered name sunflower.com, "ssh 
nathaens_AT_sunflower.com" would work. But you don't. You just have an 
email alias there.  Sunflower's systems, even if you could get their iP 
numbers and the full machine name, it will not let you in.  Their help 
page says they refuse shell access. Only ftp is allowed.

Now, on your own computer, you can find your IP by

/sbin/ifconfig

the output will show your current IP.

And, if you opened up access from your computer, you could ssh into it.
On sunflwer, you have an ip number like 24.124.81.234 and so you could try

ssh nathaens_AT_24.124.81.234

You'd have that if you were directly plugged into the cable modem.  On 
the other hand, if you have a wireless router, the router istself is 
giving out ip numbers, like 192.168.0.100, 192.168.0.101, and so forth.

You'd have to open up the firewall and run sshd service in order for 
that to happen.  system-config-security is a gui firewall configurator, 
and system-config-services can turn on ssh. You'd have to configure a 
router filter so that incoming ssh connections are diverted to the 
machine you want them to come to. If you did this:

ssh nathaens_AT_24.124.81.234

It would be like trying to log into the router, which ordinarily would 
not make sense, but if you have the router's filter set to send ssh 
connections to 192.168.0.101, say, then it would work.

> [nathaens_AT_localhost ~]$ ssh nathaens_AT_sunflower.com
> ssh_exchange_identification: Connection closed by remote host
>
> Second question is as follows, for burning disks I need to get mp3s into 
> a usable format.  Does convert work for shifting mp3s into a wav or do I 
> need some sort of other proggy?  Thanks again, and I'll see you in lab 
> tomorrow.
>
> Nate


--
Paul E. Johnson                       email: pauljohn_AT_ku.edu
Dept. of Political Science            http://lark.cc.ku.edu/~pauljohn
1541 Lilac Lane, Rm 504
University of Kansas                  Office: (785) 864-9086
Lawrence, Kansas 66044-3177           FAX: (785) 864-5700