Dynamips:

Dynamips is a Cisco router emulator written by Christophe Fillot. It emulates 1700, 2600, 3600, 3700, and 7200 hardware platforms, and runs standard IOS p_w_picpaths. ( This discription is taken from

http://dynagen.org/tutorial.htm#_Toc193247991

)



Dynagen:

Dynagen is a front-end for use with the Dynamips Cisco router emulator. It uses an INI-like configuration file to provision Dynamips emulator networks. It takes care of specifying the right port adapters, generating and matching up those pesky NIO descriptors, specifying bridges, frame-relay, ATM switches, etc. It also provides a management CLI for listing devices, suspending and reloading instances, determining and managing idle-pc values, performing packet captures, etc. ( This discription is taken from

http://dynagen.org/

)



This tutorial helps you to run cisco IOS p_w_picpaths using Dynamips-Dynagen emulators in ubuntu. Will be much useful to those whose are preparing for cisco certifications.



This tutorial doesnot explains extended network configuration of Dynamips. This guide simply provides you on howto install Dynamips-Dynagen in ubuntu and run a cisco router IOS p_w_picpath in ubuntu.



Following softwares/libs are required to run Dynamips-Dynagen



1) libpcap v0.9.x


2) python v2.5.x



Use synaptic package manager to install the above softwares



1) Go to Start>System>Administration>synaptic package manager


2) Search libpcap & python


3) Mark the above mentioned versions and press apply to install.



Install Dynamips & Dynagen:

1) Create a new directory for dynamips



Code:
sudo mkdir /opt/dynamips

2) Change to dynamips directory



Code:
cd /opt/dynamips

3) Download latest dynagen software using wget



Code:
sudo wget http://downloads.sourceforge.net/dyna-gen/dynagen-0.11.0.tar.gz?modtime=1208688475&big_mirror=0

4) Extract the tarball



Code:
sudo tar -xvzf dynagen-0.11.0.tar.gz

5) Change to /opt/dynamips/dynagen-x.x.x directory



Code:
cd /opt/dynamips/dynagen-0.11.0

6) Look at the README.txt file to see which version of Dynamips is required for this version of Dynagen



Code:
less README.txt

At the time of this tutorial, at least dynamips version 0.2.8-RC1 is required.



7) Change to /opt/dynamips directory



Code:
cd /opt/dynamips

8 ) Download Dynamips from Dynamips blog



Code:
sudo wget http://www.ipflow.utc.fr/dynamips/dynamips-0.2.8-RC2-amd64.bin

Since my arch is AMD64bit i downloaded 64bit version, You can visit

http://www.ipflow.utc.fr/blog/

to download latest and for different arch versions.



9) Use chmod to change permission



Code:
sudo chmod 755 dynamips-0.2.8-RC2-amd64.bin

10) Navigate to /usr/bin to create symbolic links for dynagen & dynamips



Code:
cd /usr/bin
Code:
sudo ln -s /opt/dynamips/dynamips-0.2.8-RC2-amd64.bin dynamips
Code:
sudo ln -s /opt/dynamips/dynagen-0.11.0/dynagen dynagen

11) Updatedb



Code:
sudo updatedb

12) Create a directory for cisco routers p_w_picpaths



Code:
sudo mkdir /opt/dynamips/p_w_picpaths
Run the simulator:

1) Download the cisco router IOS p_w_picpaths from

www.cisco.com
Note:

You must have cisco login to download the IOS p_w_picpath. Normally cisco customer & CCIE will have a login.



2) Put the downloaded cisco IOS p_w_picpath in /opt/dynamips/p_w_picpaths folder.



Code:
sudo mv c7200-jk9o3s-mz.123.12e.bin /opt/dynamips/p_w_picpaths

3) Update the configuration file with correct p_w_picpath path and RAM size required. The dynagen comes with some sample configuration file. I used it for this tutorial.



Code:
sudo vi /opt/dynamips/dynagen-0.11.0/sample_labs/simple1/simple1.net

# Simple lab



[localhost]



    `7200`

    # p_w_picpath = \Program Files\Dynamips\p_w_picpaths\c7200-jk9o3s-mz.124-7a.p_w_picpath <<--Comment out this windows path 

    # On Linux / Unix use forward slashes:

    p_w_picpath = /opt/dynamips/p_w_picpaths/c7200-jk9o3s-mz.124-7a.bin <<-- Uncomment and update this line with correct path

    npe = npe-400

    ram = 160 <<-- Update this value with required RAM size

        

    `ROUTER R1`

    s1/0 = R2 s1/0

    

    `router R2`

    # No need to specify an adapter here, it is taken care of

    # by the interface specification under Router R1

Finally save and exit. You can also specify more configuration details in this file if you know more about dynagen config parameters.



4) Start the dynamips process



Code:
sudo dynamips -H 7200 &

5) Use the dynagen command to process the .net configuration file and start the virtual network.



Code:
sudo dynagen simple1.net

You will placed inside the dynagen console



6) Use list command to list the network equipments and port details for console access.



Code:
=>list
Name    Type     State     Server           Console
R1      7200     Running   localhost:7200   2001
R2      7200     Running   localhost:7200   2002

7) Finally telnet to the router console



Code:
=> telnet R1
Note:

You can also use utilities like putty to telnet to router console.