i am using mandrake linux for 5 computers.i need to handle the other systems by a single system.
when i gave #rlogin 10.255.230.123
rlogin command not found.

when i have to poweroff other systems by this system,how can i do that?

Do not use rlogin (not even at gunpoint). It has been deprecated a loong time along with telnet.
ssh is the secure replacement for the above (with scp for secure copy).

Install openssh-server on the remote machines and openssh-clients on your local one and you should be good to go.

Another alternative is to install webmin on the remotes. That way you can admin them through a browser.

- Peder

when u have installed open ssh ,

start the deamon sshd

after with another machine

connect , and

sir connect to system by,
#ssh 10.255.240.137
and log on to the system and i started sshd.
when i give shutdown -h now it said...
[root@Simlab-node10 Desktop]# shutdown -h now

Broadcast message from root (pts/0) (Tue Jan 25 14:28:48 2005):

The system is going down for system halt NOW!
[root@Simlab-node10 Desktop]#

after that nothing happens....the system not shutdown....pls help me....

[root@Simlab-node3 staff]# ssh 10.255.240.157
ssh: connect to host 10.255.240.157 port 22: Connection refused


the address is correct but not connecting help me....

Instead of 'shutdown -h now' you could just enter 'halt' or 'reboot' (depending on what you want).
And if it doesn't shutdown, what happens? Does it hang somewhere?

Regarding "Connection refused"; have you started sshd on that server? Do a 'service sshd restart' and 'chkconfig sshd on'
If it's running, make sure you don't have any firewall rules preventing access to port 22 from your client.
Also check if there's any entry in /etc/hosts.deny preventing access.

- Peder

root@Simlab-node3 staff]# ssh 10.255.240.157
ssh: connect to host 10.255.240.157 port 22: Connection refused
[root@Simlab-node3 staff]# servise sshd restart
bash: servise: command not found
[root@Simlab-node3 staff]# service sshd restart
Stopping sshd: [ OK ]
Starting sshd: [ OK ]
[root@Simlab-node3 staff]# ssh 10.255.240.157
ssh: connect to host 10.255.240.157 port 22: Connection refused
[root@Simlab-node3 staff]# chkconfig sshd on
[root@Simlab-node3 staff]# chkconfig sshd on
[root@Simlab-node3 staff]# ssh 10.255.240.157
ssh: connect to host 10.255.240.157 port 22: Connection refused
[root@Simlab-node3 staff]

this is what happened .........

No.
You have to run the 'service....' and 'chkconfig....' commands on the remote server, 10.255.240.157.

What you have done is started sshd on Simlab-node3 (nothing wrong with that but it won't help you connecting to 10.255.240.157).

- Peder