Sponsored Content
Operating Systems Linux Ubuntu Connecting to a remote server Post 302279586 by linuxjunkie on Friday 23rd of January 2009 07:11:49 AM
Old 01-23-2009
Easy way to check it to use telnet.

To check if you can communicate with a internal mail server do the following.
from external pc.

telnet (Ip address of public nic on router) 25
eg. telnet 192.168.0.55 25

for a pop3 server connection change 25 to 110 and so on.

If you look at your firewall rules there must be a rule that says something along these lines.

"Allow in coming traffic from anywhere on port 22 to local ip address."

Now i assume that your internet router has a ipaddress on the local nic and one on the ppp+ port. So lets say your internal ip address is 192.168.0.254 and the ppp+ address is 42.253.200.110 (Assigned by your isp). now to allow a connection on port 22 (ssh) from the outside world you need to make a rule in your firewall that says this.

allow tcp traffic from anywhere on port 22 to 42.253.200.110. (Not sure what router you use).

If you have a internal server with ip address 192.168.0.115 that is separate from the router running a vnc service you would do something along these lines.

allow tcp traffic from anywhere on port 5900 to internal server 192.168.0.115

Then always remember to deny everything else from coming in as the last rule.

Hope this helps Smilie
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Connecting to remote servers

Please advise, The previous thread asked about the automated transfer of files between two servers. The question is - is there any way of encrypting the password within the script or is it a matter of setting the permissions settings on the script so that it can only be executed and possibly... (1 Reply)
Discussion started by: rdbooth
1 Replies

2. Shell Programming and Scripting

connecting to remote db from unix script

Hi everybody, My bash script is trying to connect to a remote database using the 'sqlplus' binary.For this i set(export) the variable TWO_TASK to the value of database name excluding the dot extension part. Can anyone explain me what's the significance of this TWO_TASK variable while... (8 Replies)
Discussion started by: DILEEP410
8 Replies

3. Shell Programming and Scripting

Connecting to remote unix server using java?

I need help writing java code that can connect to a remote unix server, and run a script on that server. I have scoured the internet, but I have been unable to find proper documentation on how this can be accomplished. Any help is appreciated thanks. (1 Reply)
Discussion started by: developncode
1 Replies

4. Red Hat

How to know which application is connecting to a remote host

From a host A an application is trying to connect to host B. From firewall side I can see packets dropped coming from host A to host B. I've access to host A: how can I know which "application" is trying to connect to host B? Thanks, Marco (3 Replies)
Discussion started by: marcopb
3 Replies

5. UNIX for Dummies Questions & Answers

SQL block in a Shell Script connecting to a local and remote DB

Hi All, In a Shell scriipt with a SQL block I want to issue a query against a local DB and a remote DB on a remote server. The shell script is running locally. This is how I connect to the local server. But I want the query to reference remote table in the join. Question can I specify a... (1 Reply)
Discussion started by: daveu7
1 Replies

6. Shell Programming and Scripting

Connecting to remote host

Checking crontab job entry in 3 different hosts Hi Gurus, I am trying to connect to remote host from current host to check crontab entries. I have started like this ssh -n -l db2psp 205.191.156.17 ". ~/.profile >/dev/null 2>/dev/null; cd log ;ls | wc -l" I got this error ? ssh:... (1 Reply)
Discussion started by: rocking77
1 Replies

7. Shell Programming and Scripting

Sudo connect to a remote server and execute scripts in remote server

Hello Every one!! I am trying to write a shell script which will connect to a remote server and execute scripts which are at a certain path in the remote server. Before this I am using a sudo command to change the user. The place where I am stuck is, I am able to connect to the... (6 Replies)
Discussion started by: masubram
6 Replies

8. Shell Programming and Scripting

Error when connecting to remote server to find files with timestamp today's day

I am connecting to remote server and try to check if files with timestamp as Today's day are on the directory. Below is my code TARFILE=${NAME}.tar TARGZFILE=${NAME}.tar.gz ssh ${DESTSERVNAME} 'cd /export/home/iciprod/download/let/monthly; Today=`date +%Y%m%d`; if ;then echo "We... (1 Reply)
Discussion started by: digioleg54
1 Replies

9. Shell Programming and Scripting

Script connect to remote server, not find files and exit only from remote server, but not from scrip

I have a script, which connecting to remote server and first checks, if the files are there by timestamp. If not I want the script exit without error. Below is a code TARFILE=${NAME}.tar TARGZFILE=${NAME}.tar.gz ssh ${DESTSERVNAME} 'cd /export/home/iciprod/download/let/monthly;... (3 Replies)
Discussion started by: digioleg54
3 Replies

10. Programming

Connecting remote SSH server which OSS lib to choose ?

Hey i want to be able to write simple SSH client to be able to connect to SSH server and invoke remote SSH command i found libssh and libssh2 and the old openSSh , what is the best and most supported library to choose from ? i need it to be cross platform . Thanks (0 Replies)
Discussion started by: umen
0 Replies
ccr(8)							      System Manager's Manual							    ccr(8)

Name
       ccr - remote console carrier requester

Syntax
       ccr [ options ] node

Description
       The  command  establishes  a logical connection between your ULTRIX system and the console carrier server on a remote system.  enables your
       terminal to act as the console for a remote unattended system.  For example, your terminal can act as the console for  a  Digital  Ethernet
       Communications Server (DECSA) and its resident software.  The node is the name or address of the target node.  A node name consists of from
       one to six alphanumeric characters.  A node address consist of two decimal integers (n.n), where the first  indicates  the  network  number
       (1-63), and the second indicates the node address (1-1023).

       You  can  use  to  force  a  crash if a server node becomes unresponsive.  To determine how to force a crash, see the documentation for the
       respective server product.

       The requirements for using are as follows:

       o   The host node (that is, your local ULTRIX node) and the remote node must be on the same Ethernet.

       o   If your server product is a DECSA, the console carrier server image (plutocc.sys) and its loader file (plutowl.sys) must be located	in
	   on  your  ULTRIX node. The pluocc.sys and plutowl.sys files are not need, nor is any loading done for other servers.  For more details,
	   see the installation guide for the particular server product.

       <CTRL/D> exits from console carrier mode and terminates

Options
       -c   Uses the specified circuit to connect to the target node.

       -h   Uses the specified address (next argument) as the Ethernet address of the target node.

       -n   Uses the next argument as the target node ID.

       -p   Uses the specified service password (next arguments) in accessing the target node.

Examples
       # /etc/ccr -c qna-0 -n dallas <RET>
       ccr: Remote console reserved
	    .
	    .
	    .
       <CTRL/D>
       ccr: Remote console released
       #

Restrictions
       You must have superuser privileges to run

Diagnostics
       The command can return the following diagnostic messages:

       ccr: Remote console reserved
       The command has successfully connected to the remote console server and your terminal is now capable of acting as a console for the  remote
       node.

       ccr: Remote console released
       Your connection with the remote console server has been terminated and you are no longer in console carrier mode.

       ccr: Remote console already in use
       The remote console server that you are attempting to connect to is already reserved by another user.

       ccr: Permission denied
       You do not have the necessary privileges to run (You must be a superuser.)

       ccr: Hardware address required
       The  command  is unable to locate the hardware address of the remote node to which you are attempting to connect.  A remote node's hardware
       address must be defined either in the command line, or in its nodes database entry.  (Nodes database entries are defined with the command.)

       ccr: No node entry in database
       The command does not recognize the remote node to which you are attempting to connect, since the node-id that you specified is not  defined
       in the nodes database.  (Nodes database entries are defined with the command.)

Files
       Console carrier server image

       Console carrier server loader

See Also
       addnode(8), getnode(8), load(8), remnode(8), trigger(8)
       Guide to Local Transport Servers

																	    ccr(8)
All times are GMT -4. The time now is 07:17 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy