Table of Contents for
Packet Tracer Network Simulator

Version ebook / Retour

Cover image for bash Cookbook, 2nd Edition Packet Tracer Network Simulator by Jesin A Published by Packt Publishing, 2014
  1. Cover
  2. Table of Contents
  3. Packet Tracer Network Simulator
  4. Packet Tracer Network Simulator
  5. Credits
  6. About the Author
  7. About the Reviewers
  8. www.PacktPub.com
  9. Preface
  10. Who this book is for
  11. Conventions
  12. Reader feedback
  13. Customer support
  14. 1. Getting Started with Packet Tracer
  15. Installing Packet Tracer
  16. Interface overview
  17. Creating a simple topology
  18. Summary
  19. 2. Network Devices
  20. Customizing devices with modules
  21. Emulating WAN
  22. Accessing the CLI
  23. Summary
  24. 3. Generic IP End Devices
  25. Servers
  26. Other end devices
  27. Configuring end devices
  28. Summary
  29. 4. Creating a Network Topology
  30. Testing connectivity with PDUs
  31. Using the simulation mode
  32. Clustering a topology
  33. Summary
  34. 5. Navigating and Modifying the Physical Workspace
  35. Moving devices physically
  36. Managing cables and distances
  37. Customizing icons and backgrounds
  38. Summary
  39. 6. Configuring Routing with the CLI
  40. Dynamic routing protocols
  41. The Routing table
  42. Load sharing
  43. Summary
  44. 7. Border Gateway Protocol (BGP)
  45. BGP versus dynamic routing protocols
  46. Configuring BGP in Packet Tracer
  47. Summary
  48. 8. IPv6 on Packet Tracer
  49. IPv6 static and dynamic routing
  50. Using both IPv4 and IPv6
  51. Summary
  52. 9. Setting Up a Wireless Network
  53. Wireless networks and physical workspaces
  54. Summary
  55. 10. Configuring VLANs and Trunks
  56. InterVLAN routing with routers and layer 3 switches
  57. Switch-to-switch trunk links
  58. Analyzing broadcasts in the simulation mode
  59. Summary
  60. 11. Creating Packet Tracer Assessments
  61. The initial network
  62. The answer network
  63. Testing the activity
  64. Summary
  65. Index

Chapter 6. Configuring Routing with the CLI

We have finally reached the important part of networking—routing. Routing allows communication between multiple logical networks. When configuring routing on the command line of Packet Tracer—similar to configuring on physical hardware—you'll find that Packet Tracer offers a GUI to configure static and RIP routing protocols. In addition to this, we'll also see how load balancing works using the simulation mode, which will help you understand things better.

Static routing

Static routing is the no-brainer method for configuring routing even though it requires more work. With Packet Tracer, static routing can be configured using the GUI alone. In this method, we configure a router with a destination and a gateway to reach it. So, each router in a topology should know the means to reach all destinations in the network, which requires manual work. Similarly, if a router is added or removed from the topology, all routers must be manually updated to reflect this.

Static routing with GUI

Even if you do not know Cisco commands, this feature of Packet Tracer comes in handy. For this exercise, we will be using the topology shown in the following screenshot:.

Static routing with GUI

This network has four routers in a ring topology, with no PCs or loopback interfaces. Because we will be using only the GUI here, configuration will be kept to a minimum. The topology can be configured by performing the following steps:

  1. Click on a router icon, go to the Config tab, select an interface, and configure the IP address. Make sure that you select the On checkbox in this section to bring the port state up. For this example, we'll be using the following IP addresses:

    Router

    Interface

    IP Address

    R1

    FastEthernet0/0

    192.168.10.1

     

    FastEthernet0/1

    192.168.20.1

    R2

    FastEthernet0/0

    192.168.10.2

     

    FastEthernet0/1

    192.168.30.1

    R3

    FastEthernet0/0

    192.168.20.2

     

    FastEthernet0/1

    192.168.40.1

    R4

    FastEthernet0/0

    192.168.30.2

     

    FastEthernet0/1

    192.168.40.2

  2. Under the ROUTING section, click on Static. The following screenshot is displayed:
    Static routing with GUI
  3. The following settings will be used for configuring static routing using the GUI. The concept here is to enter all routes that are not directly connected to a router and a gateway IP that belongs to a network that is directly connected.

    Device

    Network/Mask

    Next Hop

    R1

    192.168.30.0 / 255.255.255.0

    192.168.10.2

     

    192.168.40.0 / 255.255.255.0

    192.168.20.2

    R2

    192.168.20.0 / 255.255.255.0

    192.168.10.1

     

    192.168.40.0 / 255.255.255.0

    192.168.30.2

    R3

    192.168.10.0 / 255.255.255.0

    192.168.20.1

     

    192.168.30.0 / 255.255.255.0

    192.168.40.2

    R4

    192.168.10.0 / 255.255.255.0

    192.168.30.1

     

    192.168.20.0 / 255.255.255.0

    192.168.40.1

  4. Now use simple PDU and test the connectivity between all of the routers. Then use the simulation mode to find the route taken by the packets.
  5. How about taking a look at the routing table? For this, too, the GUI has an option; click on the inspect icon or press I and select a router. A table containing four routes will appear for each router, as shown in the following screenshot:
    Static routing with GUI

But we configured only two routes, so why four? The extra two routes are the subnets of the directly-connected links.

In this topology, even though there is an alternate route to each network, only one route is used because this is how we have configured it. We'll learn more about having more than one route in the Load Sharing section.

Static routing with the CLI

The configuration and the topology will be same in this section. We'll only see the commands required for one device. The topology can be configured by performing the following steps:

  1. Assign IP addresses to the interfaces on each router using the following commands:
    R1(config)#interface FastEthernet0/0
R1(config-if)#ip address 192.168.10.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#exit
R1(config)#interface FastEthernet0/1
R1(config-if)#ip address 192.168.20.1 255.255.255.0
R1(config-if)#no shutdown
R1(config-if)#exit
  2. Configure static routing with the ip route command, using the following syntax:
    R1(config)#ip route <Destination Prefix> <Destination prefix mask> <Gateway IP>
  3. For router R1, the following commands are used:
    R1(config)#ip route 192.168.30.0 255.255.255.0 192.168.10.2
R1(config)#ip route 192.168.40.0 255.255.255.0 192.168.20.2

Use simple PDU to test the connectivity. If you get message indicating a failure, switch to simulation mode and see which router is incorrectly configured.