Transcript Add/Drop Multiplexor

Lab
How to Use WANem
Last Update 2011.08.01
1.1.0
Copyright 2011 Kenneth M. Chipps Ph.D.
www.chipps.com
1
What is WANem
• WANem is a tool used to test how well an
application will perform on a network
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
2
WANem Installation
• There is no WANem installation as it runs
from a Live CD
• Just download the ios file and burn it to a
disc
• Then boot the computer that will run the
WANem program
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
3
WANem Setup
• Here are the steps to setup WANem as
described in the manual
– Boot the CD
– A Knoppix screen with a prompt in the bottom
left called boot appears
• Press Enter
– After Knoppix boots up it asks if you want to
configure all the network interfaces of the PC
using DHCP
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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WANem Setup
– If there is a DHCP server on the network
• Enter y
– If not, you will be automatically taken to a
network setup screen
– Set up the IP address for the Ethernet
interface, which is usually eth0
– Call this wanemip
– Select this interface and set up the IP
address, network mask, and default gateway
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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WANem Setup
– WANem will prompt you to enter the
password for user perc
– It will also prompt you to re-enter the
password
– Using this userid and password will allow you
to remote login to the WANem PC with
programs like putty or ssh
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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WANem Setup
– Next setup the routes between the two end
hosts so that their packets are routed via the
WANem PC when the two communicate with
each other
– From another PC on the network open a web
browser
– Enter this URL
• http://wanemip/WANem
– Now, WANem is ready for use
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Network Setup
• WANem runs on the middle of three
workstations as seen in this diagram
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Network Setup
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Network Setup Tool
• Once the network is created as shown
above one or more problems are
introduced into the network while the
application is being accessed by the end
user
• The impact of this can then be seen at
both the end user and server ends
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
10
WANem Operation
• There are two modes in WANem that can
be used to introduce the problems
– Basic
– Advanced
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Basic Mode
• In basic mode only one set of network
characteristics can be applied for each
network interface
• Each such set is called a rule set
• In the basic mode each rule set will allow
the user to specify only the following
network characteristics
– Bandwidth
– Latency
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Basic Mode
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Advanced Mode
• To use the advanced mode select the
correct network interface in advanced
mode and click the Start button
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Advanced Mode
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Advanced Mode
• The above screen shows the form for one
rule set
• All fields barring the ones in the last row
represent various network characteristics
• So a rule set identifies a set of network
characteristics
• Fill in the relevant network characteristics
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Advanced Mode
• The last row in the form starting with IP
source add determines the packets to
which the rules apply
• There are three possibilities
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Advanced Mode
– You want the same rule set to apply to any
packet that passes via WANem
• In this case you can leave this row as it is
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Advanced Mode
– You want the rule set to apply to all traffic
between the two end hosts regardless of
whether they are client or server
• Fill in the specific IP addresses of the two hosts
• Set the subnets to 32
• Leave the Application port to any
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Advanced Mode
– You want the rule set to apply to all traffic
between two end hosts which are client and
server for a given application
• Fill in the specific IP addresses of the client in IP
source addr and the address of the server in IP
destination addr
• Set the subnets to 32
• Set the Application port to the server port
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Advanced Mode
• Click Apply Settings to start WANem
• Click Refresh Settings immediately to
ensure that the settings have taken effect
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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WANem Example
• Let’s look at a basic example of how to
use WANem
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Setup the Hardware
• Connect three workstations to a single
switch
• Configure the IP addresses on the client
and server workstations as called for by
the operating system they are using with
these addresses
– Client 192.168.140.12
– Server 192.168.140.14
• Be sure all three can ping each other
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
23
WANem Installation
• Boot the computer that will run the
WANem program
– A Knoppix screen with a prompt in the bottom
left called boot appears
• Press Enter
– After Knoppix boots up it asks if you want to
configure all the network interfaces of the PC
using DHCP
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
24
WANem Setup
– Say no
– You will be automatically taken to a network
setup screen
– Set up the IP address for the Ethernet
interface, which is usually eth0 using
• 192.168.140.20
• 255.255.255.0
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
25
WANem Setup
– From another PC on the network open a web
browser
– Enter this URL
• http://192.168.140.20/WANem
– The WANem GUI screen will appear
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Change the Routing
• The routing table on the workstations must
be changed so the traffic will go through
the WANem machine instead of directly
between the client and server
• Run this command all on one line from the
client’s command line
– route add 192.168.140.14 mask
255.255.255.255 192.168.140.20
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Change the Routing
• Run this command all on one line from the
server’s command line
– route add 192.168.140.12 mask
255.255.255.255 192.168.140.20
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Check the Route
• To check the route run trace route
• Check the response time using ping
– Record this time
• Now introduce problems into the network
and record their impact as directed on the
next two slides
• Turn these two pages in
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Lab Answer Sheet
• Name __________________
• When a Delay of 500ms is introduced,
what did this do to the ping times?
• __________________________________
• When the Delay was changed to 100ms,
what did this do to the ping times?
• __________________________________
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Lab Answer Sheet
• When the Delay was removed, what did
this do to the ping times?
• __________________________________
• Now reduce the bandwidth to say a
64kbps DS0, what did this do to the ping
times?
• __________________________________
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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Source
• This is adapted from the WANem manual
Copyright 2011 Kenneth M. Chipps Ph.D. www.chipps.com
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