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So, you can successfully telnet to the loopback address and login?<br />
<br />
Can you ping the interface's IP address?
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Yes, I can SSH into the loopback interface, but I can't SSH or Telnet to the physical interface?
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Can you ping the physical interface?<br />
<br />
If not, then that's an indication of a routing issue. If you can not ping, then I would try a traceroute (tracert on Windows PCs) and see how far it will get.<br />
<br />
If you can ping successfully, then please post a scrubbed portion of the running-config showing the &quot;line vty&quot; sections.
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naderz, <br />
<br />
Sorry for the late reply, I been busy on another project, I'll check into this as soon as I can.<br />
<br />
Thank you
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I noticed on a couple devices (Cisco) on our network, that I can't remote access through a physical interface address (secure CRT), but I can through a loopback interface, I'm wondering why that is? <br />
<br />
Thank you,<br />
Dave
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I noticed on a couple devices (Cisco) on our network, that I can't remote access through a physical interface address (secure CRT), but I can through a loopback interface, I'm wondering why that is? 

Thank you,
Dave

So, you can successfully telnet to the loopback address and login?

Can you ping the interface&#39;s IP address?

Yes, I can SSH into the loopback interface, but I can&#39;t SSH or Telnet to the physical interface?

Can you ping the physical interface?

If not, then that&#39;s an indication of a routing issue. If you can not ping, then I would try a traceroute (tracert on Windows PCs) and see how far it will get.

If you can ping successfully, then please post a scrubbed portion of the running-config showing the &quot;line vty&quot; sections.

naderz, 

Sorry for the late reply, I been busy on another project, I&#39;ll check into this as soon as I can.

Thank you

Cisco interface access through a loopback interface, but not through the Serial or Ethernet interface

I noticed on a couple devices (Cisco) on our network, that I can&#39;t remote access through a physical interface address (secure CRT), but I can through a loopback interface, I&#39;m wondering why that is? 

Thank you,
Dave

Network analysis is the process of identifying and remediating the processes and systems within a network, including performance, connectivity and security. The process is performed through the use of tools developed for monitoring and analyzing network activity. Network problems that involve finding an optimal way of doing something are studied under the name combinatorial optimization. Examples include network flow, shortest path problem, transport problem, transshipment problem, location problem, matching problem, assignment problem, packing problem, routing problem, Critical Path Analysis and PERT (Program Evaluation & Review Technique).

Network Analysis

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.