Connect from Outside

Question

Hi,
I'm to connect to one 11g DB that run in SUSE. Here is the name of the DB
SQL> select name from v$database;
NAME
ORCL
SQL>
select instance_name from v$instance ;
INSTANCE_NAME
orcl
But when I login as root in the SUSE machine I've got this (the reason of that I used ssh, is due to that telnet is not available in SUSE)
[root@webserver oracle]# ssh -p 1521 orcl
ssh: Could not resolve hostname orcl: Name or service not known
Any advice for this message above?

Answer 1

HuaMin Chen wrote:
Many thanks Edstevens. Then how can I achieve that I want to be able to connect to it from outside. I know that "ssh/telnet" is one pre-condition for that, isn't it?Not necessarily. As I said before, you can install the oracle client on your desktop/laptop and use the tools from there. No need for ssh at all.
>
Another thing is:
I've just added 1521 port to the router
http://www.4shared.com/photo/SdPj4_y1/fig100.html
Do I need to reboot the router? Does anyone know if there's a "reboot" option for this model "TL-WR740N "?Don't know. I'm not a router guy.
>
Within the machine, I can ssh to 22 port without any problem:That's because port 22 is the standard port for the ssh communications protocol
>
[root@webserver ~]# ssh -p 22 3masters.dyndns.info
[email protected]'s password:
Last login: Fri May 13 23:30:13 2011 from 014198214097.ctinets.comFine, you can connect to the server.
As I said before, don't do this as root. Don't do anything as root that doesn't absolutely require the very powerful privileges of root.
[root@webserver ~]# exit
logout
But I do have problem to ssh to 1521 port below:
[root@webserver ~]# ssh -p 1521 3masters.dyndns.info
ssh_exchange_identification: Connection closed by remote host
One more time: port 1521 is used by the oracle listener to to listen for connection requests to the oracle database. SSH is not making such a request and is NOT the tool for connecting to the database. The listener has no idea what is being asked of it when ssh sends it a packet, so the listener refuses to deal with it. You DO NOT connect to port 1521 with ssh. You connect to port 1521 with an Oracle compliant, OCI aware, program such as sqlplus.
Any ideas?
Think of SSH as being unix's equivielent to Windows cmd.exe. You don't connect to the database with cmd, though you may open cmd and then, from there, execute sqlplus.
What do you imagine yourself doing once you 'connect from the outside'? What commands are you expecting to give? What are you expecting to see?
Best regards
Edited by: HuaMin Chen on May 13, 2011 11:51 PM