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IPv6 Training (Cisco): Enabling Telnet on an IPv6 Router and Establishing Telnet Sessions from the Router 

Added: 09/04/2008, Hits: 5,130, Rating: 0, Comments: 0, Votes: 0
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Well, just in case you are new to the word “telnet”; telnet is an Application Layer protocol that can be used to make direct connections (using telnet sessions) to a Cisco router or from a Cisco router. It doesn’t matter whether you’re using the IPv4 protocol or the IPv6 protocol, “telnet” performs in the same manner.

A network administrator can use “telnet” to make the following different types of direct connections (telnet sessions):
  • Host to Router

  • Router to Router

  • Router to Host

In this article, I’m going to show you how to enable “telnet” on a Cisco IPv6 router, so you’ll be able to directly connect to it via telnet sessions and I’m also going to show you how you can initiate a “telnet” session from a Cisco IPv6 Router.

Here are the steps needed to enable “telnet” on a Cisco IPv6 router:

1. Router>enable
2. Router#configure terminal
3. Router(config)#ipv6 host name [port] ipv6-address1 [ipv6-address2...ipv6-address4]
4. Router(config)#line [aux | console | tty | vty] line-number [ending-line-number]
5. Router(config-line)#password password
6. Router(config-line)#login [local | tacacs]
7. Router(config-line)#ipv6 access-class ipv6-access-list-name {in | out}
8. Router(config-line)#end
9. Router#copy run start

And, here are the steps needed to initiate a “telnet” session from a Cisco IPv6 router:

1. Router>enable
2. Router#telnet host [port] [keyword]

First Steps Explained:

Step #1

1. Router>enable

Puts router into Privileged EXEC mode.

Step #2

2. Router#configure terminal

Puts router into Global configuration mode.

Step #3

3. Router(config)#ipv6 host cisco-test 2001:0DB8:20:1::12

Defines a static host name-to-address mapping in the host name cache.

Step #4

4. Router(config)#line vty 0 4

Creates a vty interface and places router into Line configuration mode.

Step #5

5. Router(config-line)#password ittechtips

Creates a (ittechtips) password that enables Telnet.

Step #6

6. Router(config-line)#login tacacs

Informs the router to use the tacacs server for password checking at login.

Step #7

7. Router(config-line)#ipv6 access-class vty-acl in

Adds an IPv6 access list named vty-acl to the line interface, which restricts remote access to telnet sessions that match the access list.

Step #8

8. Router(config-line)#end

Causes router to exit Line configuration mode and re-enters into Privileged EXEC mode.

Step #9

9. Router#copy run start

Saves the contents of the running-config to local Non -Volatile Random Access Memory (NVRAM).

Second Steps Explained:

Step #1

1. Router>enable

Puts router into Privileged EXEC mode.

Step #2

2. Router#telnet cisco-test

Using the “Telnet” command to establish a Telnet session from the router to a remote host; using either the host’s name or the host’s IPv6 address. A Telnet session can be established to a router’s name or to an IPv6 address.

I invite you to visit my website at where you’ll find the latest information regarding Cisco IPv6 Design and Implementation Techniques. And, also learn more about the new "Cisco IPv6 Video Accelerated Training Course" which contains over 3000 videos that will teach you all you need to know about Designing, Building, and Deploying Cisco IPv6 networks. (Guaranteed)

To your success,

Charles Ross
CCNP #CSCO10444244

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