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Telnet with public IP will not connect

Posted on 2009-05-13
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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?
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Question by:GMSMRM
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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?
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by:GMSMRM
ID: 24440509
It has the DNS server address.
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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?
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by:GMSMRM
ID: 24442281
The DNS server is on the network.
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by:lanboyo
ID: 24442576
What type of configuration interface do you have? is there any place to set a default gateway or add routes?
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lanboyo earned 500 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.
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