Cisco Packet Tracer 8.x tutorials
Introduction
Cisco Packet Tracer 8.2 is a powerful simulation software for CCNA and CCNP certification exam training. The video tutorials provided in this sections will help you to understand the basics of Packet Tracer 8.2 operations (tutorial 1) and how the simulation mode works to get a deep analysis of packet flow between network devices (tutorial 2).
Video tutorial 3 provides an advanced network configuration example using Packet Tracer 8.2 in a VOIP lab scenario.
Tutorial 1 - Basic network configuration
This first video demonstrates basic use of Packet Tracer 8.2. It will show you how to configure IP services on a Cisco ISR router and a workstation in the CiscoTM Packet Tracer 8.2 network simulation software :
- IP address configuration
- Connection to a router using a crossover cable
- Initial configuration of the router and the workstation
You can configure the workstation's global and interface settings on the Config tab.
The Desktop tab provides additional tools to configure workstation dial-up settings, IP settings, use a terminal window, open a host command line interface, open a web browser, configure LinksysTM wireless settings, establish a VPN connection, generate network frames, and issue SNMP requests to network devices.
Tutorial 2 -Following packets
This second video tutorial shows how Packet Tracer can capture and display the content of packet as they go through the network (simulation mode). Features are similar to an advanced network tracking software and allows monitoring of frames as they go through and are processed by network devices. The network monitoring tools are available in Packet Tracer simulation mode.
Tutorial 3 - Configure Cisco Call Manager Express (CME)
This advanced Packet Tracer 8.2 video tutorial explains the different options available in Cisco Packet Tracer for Call Manager Express (CME) configuration on a Cisco 2811 ISR router.
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Introduction - IPSEC VPN on ISR routers
Cisco Packet Tracer allows IPSEC VPN configuration between routers. The example below presents a basic VPN configuration over a Frame Relay between Paris and New-York using Cisco 2811 routers.
IPSEC Tunneling allows network adminisrators to use the Internet to create secure connections between networks (teleworkers, remote sites, ...). Cisco 2811 routers use the ISAKMP and IPsec tunneling standards to crete and manage tunnels. IPsec provides authentication (AH) and encryption (ESP) services to prevent unauthorized data access or modification. ISAKMP is the negotiation protocol that makes peers negociate on how to build the IPsec security association.
A major problem with IPSec sessions is that they do not support multicast or broadcast traffic. Enabling dynamic routing protocols such as OSPF or EIGRP requires multicast or brodcast support to allow hellos and updates traffic between routers.
Solution : Build another generic tunnel over IPSEC. Three options available in Cisco routers :
- Virtual Tunnel Interface (VTI)
- Generic Routing Encapsulation (GRE)
- DMVPN and GET VPN
GRE over IPSEC has been working in Cisco Packet Tracer since at least version 6.0.1 . This tunnel design allows OSPF dynamic routing over the tunnel
Access point overview
The Cisco 819 ISR supports built-in enterprise class WLAN capability with an embedded Cisco 3500 Access Point featuring 802.11a/b/g/n and 2X3 MIMO antenna diversity (2 transmitting antennas and 3 receiving antennas). With the dual 802.11 radio capability, the integrated AP can serve both as an access point and as a client to another wireless network for backbone/internet connectivity. This provides another source for WAN diversity along with Gigabit Ethernet, serial, and 3G/4G capabilities.
The Cisco 819 ISR router wireless access-point is a service module connected to the router with the following interfaces :
- wlan-ap0 for access point management
- Wlan-GigabitEthernet0 for production traffic between the router and the AP. This interface can be configured as a trunk to allow the AP to link multiple SSID to different vlans
Router#show ip interface brief Interface IP-Address OK? Method Status Protocol GigabitEthernet0 unassigned YES NVRAM administratively down down FastEthernet0 unassigned YES unset up down FastEthernet1 unassigned YES unset up down FastEthernet2 unassigned YES unset up down FastEthernet3 unassigned YES unset up down Serial0 unassigned YES NVRAM administratively down down Wlan-GigabitEthernet0 unassigned YES unset up up wlan-ap0 10.10.10.1 YES TFTP up up Cellular0 unassigned YES unset administratively down down Vlan1 10.10.10.1 YES NVRAM up up
What is Netflow?
Netflow is a network analysis protocol that was initially created by Cisco to give the ability to collect detailled informations about network traffic as it flows through a router interface.
The data processed by Netflow collectors provides the network administrator with detailled traffic informations such as the source and destination of the traffic, class of service, .... Netflow version 9 was standardized in 2008 as IPFIX by the IETF organization. This feature is used by network operators for billing network users.
NetFlow records are exported to a Netflow collector using User Datagram Protocol (UDP). The IP address and the destination UDP port of the NetFlow collector have to be configured on the sending device (router or l3 switch). The standard value is UDP port 2055, but other values like 9555 or 9995 can also be used.