Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
?
Solved

Telnet with public IP will not connect

Posted on 2009-05-13
6
Medium Priority
?
534 Views
Last Modified: 2012-06-27
I have a Samsung iDCS phone system with Voice Mail that I can access via Telnet using the network port and the private IP I assigned it. I used a 1-to-1 NAT on my firewall and assigned it a public IP. Using this IP it will not connect.
I tested the Telnet service through the firewall using another server with the same setup and was successful.
Why can I not connect to my phone system this way?
0
Comment
Question by:GMSMRM
  • 4
  • 2
6 Comments
 
LVL 10

Expert Comment

by:lanboyo
ID: 24425566
Most likely your phone system does not have a route back to the internet. Did you give it a static route?
0
 

Author Comment

by:GMSMRM
ID: 24440509
It has the DNS server address.
0
 
LVL 10

Expert Comment

by:lanboyo
ID: 24441697
Right. I don't know how to add routes to this device, but does it have a valid route to the internet? A default gateway? Is the dns server on your network or on the internet?
0
Hire Technology Freelancers with Gigs

Work with freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely, and get projects done right.

 

Author Comment

by:GMSMRM
ID: 24442281
The DNS server is on the network.
0
 
LVL 10

Expert Comment

by:lanboyo
ID: 24442576
What type of configuration interface do you have? is there any place to set a default gateway or add routes?
0
 
LVL 10

Accepted Solution

by:
lanboyo earned 2000 total points
ID: 24447260
As far as I can tell the system has no way to add a default route to it. It has the capability to add a remote VOIP network, which is essentially adding a static route, but it does not seem to have the capability to add a default route. So, most likely, your telnet connection reaches the device, but the device does not know how to get back because it does not have a default route. This seems to be a deliberate security limitation.
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

We all know how boring and exhausting it is to transfer huge web projects developed locally to a webserver simply via FTP. The File Transfer Protocol is a really nice solution if you need to transfer small amounts of files, but if you're plannin…
Secure Shell (SSH) is a network protocol for secure data communication, mainly used to administer remote Unix / Linux servers via command line. But it also allows the user to open a secure tunnel between a client and a server where he can send any k…
Viewers will learn how to properly install and use Secure Shell (SSH) to work on projects or homework remotely. Download Secure Shell: Follow basic installation instructions: Open Secure Shell and use "Quick Connect" to enter credentials includi…
Integration Management Part 2
Suggested Courses

580 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question