Cisco CCNA / CCNP Home Lab Setup: How To Configure Reverse Telnet

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Occasionally, during your CCNA and CCNP studies, you will run into a term that simply doesn’t quite make sense. (Ok, more than sometimes!) 1 such term is”reverse telnet”. As a Cisco certification candidate, then you know that telnet is a protocol that allows you to remotely link to a networking device such as switch or a router. However, what will be”reverse telnet”, and that’s it so important to some Cisco CCNA / CCNP home lab installation?

Then a reverse telnet session is started while the host apparatus itself reproduces the telnet session where a telnet session is started by a remote user that would like to remotely control a router or switch.

At an CCNA / CCNP home lab , reverse telnet used and is configured on the access server. Such as most of us are utilized to the access server isn’t a box machine; an access server is a Cisco router that permits you to link to multiple routers and switches with a single session without having to transfer a rollover cable from device to device.

Your access server may use an cable to link to another routers and switches in your home lab. The cable has one connector that will connect with this access server, and also eight connectors that will connect to some other home lab devices. Your access server needs an IP Host table in order to carry out reverse telnet.

An IP Host table isn’t hard to put together (and you know how to compose one to pass the CCNA!) . The IP Host table is used for name resolution, taking the place of a DNS server. A access server IP Host table looks like this:

ip host FRS 2007 100.1.1.1

ip host R3 2003 100.1.1.1

ip host R1 2001 100.1.1.1

ip host R2 2002 100.1.1.1

ip host R4 2004 100.1.1.1

ip host R5 2005 100.1.1.1

ip host SW1 2006 100.1.1.1

interface Loopback0

ip address 100.1.1.1 255.255.255.255

no ip directed-broadcast

This configuration will let you use your access server without moving a cable to connect to a frame relay switch, five routers, and a switch. If you type”R1″ in the console lineup, by way of instance, you’re going to be linked to R1 via reverse telnet. If you have a lab, an access server remains an investment and a real timesaver. And you can even connect from locations that are distant!