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Telnet from a 2nd or 3rd IP address from 1 NIC

Posted on 2015-01-12
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Last Modified: 2015-01-23
I am needing to test for open ports on specific IP addresses. I have one physical NIC with 4 IP's. One internal IP and 3 external facing IP's (Lync Edge 2013).

I need to be able to telnet to specific ports from specified IP addresses. How do I accomplish this? Please be detailed and specific please. I can view my routing table but Im not sure 100% at what I am looking at or perhaps need to change.
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Question by:Group_007
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Expert Comment

by:Steven Sheeley
ID: 40545512
Are you looking to test to see if ports are open on your external IP addresses?  From an external machine merely open a command windows and type

telnet [IP Address] [Port]

If the connection times out or is refused then you have a blocked port, if the window clears and you are left with a blinking cursor in the upper left corner then the machine in question has accepted the connection, the port is open.
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by:Group_007
ID: 40545527
Yes, I have three external IP's and these IP's are should be setup to allow certain ports. Some ports are bidirectional whereas other are not.
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by:Group_007
ID: 40545538
Let me clear this up a bit, my mistake. When I say external IP's I really meant IP's that are in our DMZ. These IP are then NAT's to public IP's. The IP;s that I need to verify the the external facing DMZ IP's. The public IP's I can verify...
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Steven Sheeley earned 500 total points
ID: 40545600
If they are NAT'd then you should pass through the public IP's into the DMZ IP's, Your traffic should flow as any normal traffic would flow in the case of traffic to and from the edge.

If everything is working, and I have done this myself, if you telnet to the public IP on the specified port, if everything is working you'll get a connection.
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