Router Virtualization With GNS3

Router Virtualization with GNS3
(graphical network simulator)

Steven Glogger <steven.glogger@swisscom.com>

Topic
2

14.08.2009
• Introduction / What is GNS3?
– What is GNS3, History, Features

GNS3 (Steven Glogger, steven.glogger@swisscom.com)
– Preview / Demo
• Installation
• Conﬁguration
• Some Words about…
– IOS upgrades
– Switching
• First Steps
• Sni ng
• Q&A

Introduction (1/5)
3

14.08.2009
• What is GNS3?
– „GNS3 is a graphical network simulator and an excellent

complementary tool to real labs for administrators of Cisco networks
or people wanting to pass their CCNA, CCNP, CCIP or CCIE
certiﬁcations„
– Just use GNS3 to simulate, test, train… whatever you want
• Technical dependencies / Wording:
– GNS3 = GUI
– Dynamips = Emulator for IOS
– Dynagen = Frontend for Dynamips
– Pemu = Cisco PIX ﬁrewall emulator based on Qemu
– (Win)Pcap = Packet Capture Library (Driver for Sni er)
– Wireshark (old name: ethereal) = Network Sni er

Introduction (2/5)
4

14.08.2009
• History
– Christophe Fillot started in august 2005 a project to simulate Cisco

7200 on PC‘s.
– Now supports Cisco 3600 series (3620, 3640 and 3660), 3700 series
(3725, 3745) and 2600 series (2610 to 2650XM, 2691)
– Performance: 1kpps (vs 100kpps on NPE-100)

Introduction (3/5)
5

14.08.2009
• Features
– Design of high quality and complex network topologies.

– Emulation of many Cisco router platforms and PIX ﬁrewalls.
– Simulation of simple Ethernet, ATM and Frame Relay switches.
– Connection of the simulated network to the real world!
– Packet capture using Wireshark
• Supported OS:
– Windows
– Unix / Linux / FreeBSD
– Mac OS X
• Supported Devices:
– Cisco 1700, 2600, 3600, 3700, and 7200 series + WIC‘s
– Switching: Sorry, not possible. Simple switch is available. For
complex stu NM-16ESW module in a touter

Introduction (4/5) – Supported Cards
6

14.08.2009
THIS LIST IS INCOMPLETE ,-)
• The following Cisco 7200 Port Adapters (PA) are currently supported:
– FastEthernet cards "C7200-IO-FE" and "PA-FE-TX" based on DEC21140 chip
– FastEthernet cards "C7200-IO-2FE" and "PA-2FE-TX" based on Intel i8254x chips

– GigabitEthernet cards "C7200-IO-GE-E" and "PA-GE" based on Intel i8254x chips
– Ethernet cards "PA-4E" and "PA-8E" based on AMD Am79c97x chips
– ATM card "PA-A1" based on Texas Instruments Tneta1570 chip
– Serial cards "PA-4T+" and "PA-8T"
– POS (Packet over Sonet) card "PA-POS-OC3" (experimental, only works with recent IOS images)
• The following Cisco 3600 (3620,3640,3660) Network Modules (NM) are currently supported:
– Ethernet cards: "NM-1E", "NM-4E" and "NM-1FE-TX", all based on AMD Am79c97x chips
– Ethernet switching module: "NM-16ESW"
– Serial card "NM-4T"
• The following Cisco 2691/3725/3745 Network Modules (NM) are currently supported:
– FastEthernet cards: "NM-1FE-TX"
– Serial card "NM-4T"
– Serial Cards: WIC-1T, WIC-2T
• The following Cisco 2600 Network Modules (NM) are currently supported:
– Ethernet cards: "NM-1E", "NM-4E" and "NM-1FE-TX"
– Serial Cards: WIC-1T, WIC-2T
• The following Cisco 1700 Network Modules (NM) are currently supported:
– Serial Cards: WIC-1T, WIC-2T and WIC-1ENET

Introduction (5/5) – Some Screenshots
7

GNS3 (Steven Glogger, steven.glogger@swisscom.com) 14.08.2009

Demo: How to work with it
8


Installation (1/2) – GNS3
9

14.08.2009
• Use the distributed CD‘s to install.
• Bad News = Administrator Priviledges are required (dynamips depends

on pcap)

Installation (2/2) - Wireshark
10

14.08.2009
• Use the distributed CD‘s to install.
• Bad News = Administrator Priviledges are required (again pcap)


• Click on „1“
• Start GNS3 ,-)
First Run (1/3)
11


First Run (2/3)
12

14.08.2009
• Open Explorer: Copy IOS from CD somewhere on disk
• Click on „2“ Choose ‚uncompressed‘

c7200-adventerprisek9-mz.124-22.T1.bin.unpacked

First Run (3/3)
13


• Problem: CPU=100%
First Run – CPU (idle_pc) (1/3)
14


15

14.08.2009
• Solution:
– Put a single router in Topology

– Start it
– Wait until it has booted Login
– GNS3: Right mouse click Idle PC
– Choose value with *

16

14.08.2009
• Another must:
– If the router logs you out CPU = 100%

Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#line con 0
Router(config-line)#no exec-timeout

First Run – Words about…
17

14.08.2009
• Switching:
– Cannot be simulated. Simple Switch. Or: NM-16ESW

• Always start with „New Project“

• IOS Upgrade: edit .net ﬁle and restart.
copy tftp whatever is not working.

Demo: How to work with it
18


Sni ng

• Easy! Click on a Link
Capture
19


Building a simple Topology
20


Building some Complex Topology
21


Further Links
22

14.08.2009
• GNS3: http://www.gns3.net
– Documentation & Tutorials: http://www.gns3.net/documentation
– GNS3 LiveCD: http://www.gns3-labs.com

• Dynagen: http://dynagen.org/

• Dynamips: http://www.ipﬂow.utc.fr/blog/
– Wiki: http://www.ipﬂow.utc.fr/index.php/Cisco_7200_Simulator
– Forum: http://7200emu.hacki.at/

• WinPcap: http://www.winpcap.org/

• Wireshark: http://www.wireshark.org/

• Virtual PC Simulator: http://wiki.freecode.com.cn/doku.php?id=wiki:vpcs
– http://7200emu.hacki.at/viewtopic.php?t=4201&sid=59ef9b9cc664d8e26445ce368f560901
– http://7200emu.hacki.at/viewtopic.php?t=5982&highlight=vpcs

Questions?
23


Router Virtualization With GNS3

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