© 2015 The Regents of the University of Michigan Networks: some days are more cloudy than others “Why doesn’t my application work?”
Networks: some days are more cloudy than others
Jul 17, 2015
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copy 2015 The Regents of the University of Michigan
Networks some days
are more cloudy than
othersldquoWhy doesnrsquot my application workrdquo
Networks ndash all about messages
Mary
Fred
BobKati
Ted
Jane
bull Kati wants to send a message to Ted
bull Bob wants to send a note to Mary
bull Fred want to ask Jane a question
bull Jane needs to send Ted a contract
bull Mary owes Kati a proposal
Letrsquos create a message passing system
Networks ndash A switchboard operator
Mary
Fred
BobKati
Ted
Jane
Operator ill no switchboard service
Mary
Fred
BobKati
Ted
Jane
What if we had multiple operators
Mary
Fred
BobKati
Ted
Jane
Imagine several are taking sick days
Mary
Fred
BobKati
Ted
Jane
Can Kati still send a message to Ted
Can Fred ask Jane a question
Can Bob Send a note to Mary
Congrats You understand routers
Mary
Fred
BobKati
Ted
Jane
The Dwight D Eisenhower System of Interstate and Defense
Highways
Internet is similar to Interstate
Questions about the Internet
bull Who owns it
bull Who do you call when it doesnrsquot work
bull What are the alternatives
ldquolocalrdquo Internet
Local network
bull IP Address
ndash IPv4 or IPv6
bull Do you need ldquorealrdquo addresses Do you need IPv4 addresses
ndash To VLAN or not to VLAN (hints found here and here)
bull Subnet masks amp gateway addresses matter
ndash To NAT or not to NAT
bull How many public IP addresses do you require
bull How many local IP addresses do you need
bull Firewalls often require NAT addresses (Security by Obscurity)
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
Networks ndash all about messages
Mary
Fred
BobKati
Ted
Jane
bull Kati wants to send a message to Ted
bull Bob wants to send a note to Mary
bull Fred want to ask Jane a question
bull Jane needs to send Ted a contract
bull Mary owes Kati a proposal
Letrsquos create a message passing system
Networks ndash A switchboard operator
Mary
Fred
BobKati
Ted
Jane
Operator ill no switchboard service
Mary
Fred
BobKati
Ted
Jane
What if we had multiple operators
Mary
Fred
BobKati
Ted
Jane
Imagine several are taking sick days
Mary
Fred
BobKati
Ted
Jane
Can Kati still send a message to Ted
Can Fred ask Jane a question
Can Bob Send a note to Mary
Congrats You understand routers
Mary
Fred
BobKati
Ted
Jane
The Dwight D Eisenhower System of Interstate and Defense
Highways
Internet is similar to Interstate
Questions about the Internet
bull Who owns it
bull Who do you call when it doesnrsquot work
bull What are the alternatives
ldquolocalrdquo Internet
Local network
bull IP Address
ndash IPv4 or IPv6
bull Do you need ldquorealrdquo addresses Do you need IPv4 addresses
ndash To VLAN or not to VLAN (hints found here and here)
bull Subnet masks amp gateway addresses matter
ndash To NAT or not to NAT
bull How many public IP addresses do you require
bull How many local IP addresses do you need
bull Firewalls often require NAT addresses (Security by Obscurity)
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
Networks ndash A switchboard operator
Mary
Fred
BobKati
Ted
Jane
Operator ill no switchboard service
Mary
Fred
BobKati
Ted
Jane
What if we had multiple operators
Mary
Fred
BobKati
Ted
Jane
Imagine several are taking sick days
Mary
Fred
BobKati
Ted
Jane
Can Kati still send a message to Ted
Can Fred ask Jane a question
Can Bob Send a note to Mary
Congrats You understand routers
Mary
Fred
BobKati
Ted
Jane
The Dwight D Eisenhower System of Interstate and Defense
Highways
Internet is similar to Interstate
Questions about the Internet
bull Who owns it
bull Who do you call when it doesnrsquot work
bull What are the alternatives
ldquolocalrdquo Internet
Local network
bull IP Address
ndash IPv4 or IPv6
bull Do you need ldquorealrdquo addresses Do you need IPv4 addresses
ndash To VLAN or not to VLAN (hints found here and here)
bull Subnet masks amp gateway addresses matter
ndash To NAT or not to NAT
bull How many public IP addresses do you require
bull How many local IP addresses do you need
bull Firewalls often require NAT addresses (Security by Obscurity)
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
Operator ill no switchboard service
Mary
Fred
BobKati
Ted
Jane
What if we had multiple operators
Mary
Fred
BobKati
Ted
Jane
Imagine several are taking sick days
Mary
Fred
BobKati
Ted
Jane
Can Kati still send a message to Ted
Can Fred ask Jane a question
Can Bob Send a note to Mary
Congrats You understand routers
Mary
Fred
BobKati
Ted
Jane
The Dwight D Eisenhower System of Interstate and Defense
Highways
Internet is similar to Interstate
Questions about the Internet
bull Who owns it
bull Who do you call when it doesnrsquot work
bull What are the alternatives
ldquolocalrdquo Internet
Local network
bull IP Address
ndash IPv4 or IPv6
bull Do you need ldquorealrdquo addresses Do you need IPv4 addresses
ndash To VLAN or not to VLAN (hints found here and here)
bull Subnet masks amp gateway addresses matter
ndash To NAT or not to NAT
bull How many public IP addresses do you require
bull How many local IP addresses do you need
bull Firewalls often require NAT addresses (Security by Obscurity)
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
What if we had multiple operators
Mary
Fred
BobKati
Ted
Jane
Imagine several are taking sick days
Mary
Fred
BobKati
Ted
Jane
Can Kati still send a message to Ted
Can Fred ask Jane a question
Can Bob Send a note to Mary
Congrats You understand routers
Mary
Fred
BobKati
Ted
Jane
The Dwight D Eisenhower System of Interstate and Defense
Highways
Internet is similar to Interstate
Questions about the Internet
bull Who owns it
bull Who do you call when it doesnrsquot work
bull What are the alternatives
ldquolocalrdquo Internet
Local network
bull IP Address
ndash IPv4 or IPv6
bull Do you need ldquorealrdquo addresses Do you need IPv4 addresses
ndash To VLAN or not to VLAN (hints found here and here)
bull Subnet masks amp gateway addresses matter
ndash To NAT or not to NAT
bull How many public IP addresses do you require
bull How many local IP addresses do you need
bull Firewalls often require NAT addresses (Security by Obscurity)
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
Imagine several are taking sick days
Mary
Fred
BobKati
Ted
Jane
Can Kati still send a message to Ted
Can Fred ask Jane a question
Can Bob Send a note to Mary
Congrats You understand routers
Mary
Fred
BobKati
Ted
Jane
The Dwight D Eisenhower System of Interstate and Defense
Highways
Internet is similar to Interstate
Questions about the Internet
bull Who owns it
bull Who do you call when it doesnrsquot work
bull What are the alternatives
ldquolocalrdquo Internet
Local network
bull IP Address
ndash IPv4 or IPv6
bull Do you need ldquorealrdquo addresses Do you need IPv4 addresses
ndash To VLAN or not to VLAN (hints found here and here)
bull Subnet masks amp gateway addresses matter
ndash To NAT or not to NAT
bull How many public IP addresses do you require
bull How many local IP addresses do you need
bull Firewalls often require NAT addresses (Security by Obscurity)
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
Congrats You understand routers
Mary
Fred
BobKati
Ted
Jane
The Dwight D Eisenhower System of Interstate and Defense
Highways
Internet is similar to Interstate
Questions about the Internet
bull Who owns it
bull Who do you call when it doesnrsquot work
bull What are the alternatives
ldquolocalrdquo Internet
Local network
bull IP Address
ndash IPv4 or IPv6
bull Do you need ldquorealrdquo addresses Do you need IPv4 addresses
ndash To VLAN or not to VLAN (hints found here and here)
bull Subnet masks amp gateway addresses matter
ndash To NAT or not to NAT
bull How many public IP addresses do you require
bull How many local IP addresses do you need
bull Firewalls often require NAT addresses (Security by Obscurity)
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
The Dwight D Eisenhower System of Interstate and Defense
Highways
Internet is similar to Interstate
Questions about the Internet
bull Who owns it
bull Who do you call when it doesnrsquot work
bull What are the alternatives
ldquolocalrdquo Internet
Local network
bull IP Address
ndash IPv4 or IPv6
bull Do you need ldquorealrdquo addresses Do you need IPv4 addresses
ndash To VLAN or not to VLAN (hints found here and here)
bull Subnet masks amp gateway addresses matter
ndash To NAT or not to NAT
bull How many public IP addresses do you require
bull How many local IP addresses do you need
bull Firewalls often require NAT addresses (Security by Obscurity)
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
Internet is similar to Interstate
Questions about the Internet
bull Who owns it
bull Who do you call when it doesnrsquot work
bull What are the alternatives
ldquolocalrdquo Internet
Local network
bull IP Address
ndash IPv4 or IPv6
bull Do you need ldquorealrdquo addresses Do you need IPv4 addresses
ndash To VLAN or not to VLAN (hints found here and here)
bull Subnet masks amp gateway addresses matter
ndash To NAT or not to NAT
bull How many public IP addresses do you require
bull How many local IP addresses do you need
bull Firewalls often require NAT addresses (Security by Obscurity)
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
Questions about the Internet
bull Who owns it
bull Who do you call when it doesnrsquot work
bull What are the alternatives
ldquolocalrdquo Internet
Local network
bull IP Address
ndash IPv4 or IPv6
bull Do you need ldquorealrdquo addresses Do you need IPv4 addresses
ndash To VLAN or not to VLAN (hints found here and here)
bull Subnet masks amp gateway addresses matter
ndash To NAT or not to NAT
bull How many public IP addresses do you require
bull How many local IP addresses do you need
bull Firewalls often require NAT addresses (Security by Obscurity)
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
ldquolocalrdquo Internet
Local network
bull IP Address
ndash IPv4 or IPv6
bull Do you need ldquorealrdquo addresses Do you need IPv4 addresses
ndash To VLAN or not to VLAN (hints found here and here)
bull Subnet masks amp gateway addresses matter
ndash To NAT or not to NAT
bull How many public IP addresses do you require
bull How many local IP addresses do you need
bull Firewalls often require NAT addresses (Security by Obscurity)
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
Local network
bull IP Address
ndash IPv4 or IPv6
bull Do you need ldquorealrdquo addresses Do you need IPv4 addresses
ndash To VLAN or not to VLAN (hints found here and here)
bull Subnet masks amp gateway addresses matter
ndash To NAT or not to NAT
bull How many public IP addresses do you require
bull How many local IP addresses do you need
bull Firewalls often require NAT addresses (Security by Obscurity)
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
Logs Logs and more Logs
bull Windows ndash Administrator Tools Event Log
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
Questions
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
Image Attributions
bull People icons blank US map network technologies
httpopenclipartorg public domain
bull Switchboard operator
httpcommonswikimediaorgwikiFileWAC_Cpl_Alma_Bradley_oper
ates_the_switchboard_at_the_22Little_White_House22_the_resid
ence_of_President_Harry_S_-_NARA_-_198826jpg public domain
bull Interstate Map
httpcommonswikimediaorgwikiFileHighways1955gif public
domain
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
copy 2015 The Regents of the University of Michigan
Thank you
Bob Riddle ndash bdrumichedu - 7343302533
ndash bobriddlegmailcom
wwwmsismedumichedu
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