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This is a strange setup.<br />
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Does the router have a route to the 178.168.x.x network?
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This is a strange setup.

Does the router have a route to the 178.168.x.x network?

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This is just test the setup, PC would be replaced by another device later. Router has 178.168.0.0 network definedfor EIRGP. csu is ext.
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This is just test the setup, PC would be replaced by another device later. Router has 178.168.0.0 network definedfor EIRGP. csu is ext.

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Thanks, we were just trying to prove that connected devices would work. 
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Thanks, we were just trying to prove that connected devices would work.

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<div class="content wysiwyg-content">
We have a PC with 178.168.x.x address and subnet connected to an ext CSU. The CSU is hooked to Router via T1 serial connection. Router &amp;&nbsp;CSU can ping each others IP address (12.31.100.1 &amp;&nbsp;12.31.100.2). PC can Ping CSU ip address. The question is that PC can't seem ping any of the inside EIGRP ip addresses. What Can be done so that PC can ping the network?<br />
<br />
PC --&gt; CSU --&gt; Router ---&gt;EIGRP Network
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We have a PC with 178.168.x.x address and subnet connected to an ext CSU. The CSU is hooked to Router via T1 serial connection. Router & CSU can ping each others IP address (12.31.100.1 & 12.31.100.2). PC can Ping CSU ip address. The question is that PC can't seem ping any of the inside EIGRP ip addresses. What Can be done so that PC can ping the network?

PC --> CSU --> Router --->EIGRP Network

PC not able to ping rest of network

The Internet Protocol (IP) is the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries, organized in abstraction layers, traditionally called "Link," "Internet," "Transport" and "Application”. Its routing function enables internetworking, and essentially establishes the Internet. IP defines packet structures that encapsulate the data to be delivered. It also defines addressing methods that are used to label the datagram with source and destination information.

Internet Protocols

Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.

Network Architecture

Network Operations includes asset management, help-desk supervision, security and user policies, infrastructure administration and anything else that affects the operation of your network. Discussions will include those of best practices in platforms, configurations, performance, security and accounting.