Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl...

“Switched LAN” - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl

Capitolo 7

I protocolli di trasporto e di servizio della famiglia TCP/IP


Porta numero 2523

Porta numero 4322


Options PAD

Checksum Urgent Pointer

HLEN Reser. CodeBits Window

Acknowledgement Number

Sequence Number

Source Port Destination Port

32 bit


Server

SYN,SN=18421174SYN,SN=18421174

SYN,ACK,SN=1249155681,AN=18421175SYN,ACK,SN=1249155681,AN=18421175

SYN,ACK,SN=18421175,AN=1249155682SYN,ACK,SN=18421175,AN=1249155682

130.192.5.33

2351

130.192.3.29

80

AN: Acknowledgment Number

SN: Sequence Number

Client


130.192.2.53

130.192.5.33

4549

Client

FIN,ACK,SN=2541997339,AN=41635320FIN,ACK,SN=2541997339,AN=41635320

FIN,ACK,SN=41635320,AN=2541997340FIN,ACK,SN=41635320,AN=2541997340

FIN,SN=41635319FIN,SN=41635319

FIN,SN=2541997339,AN=41635320FIN,SN=2541997339,AN=41635320

ServerAN: Acknowledgment Number

SN: Sequence Number

110


Byte trasmesso di cui è nota l’avvenuta consegnaByte trasmesso sulla cui consegna non si hanno informazioniByte non ancora trasmessoByte non ancora trasmissibile

Finestra di trasmissione3 4 8 11 18 30

Finestra di trasmissione dopo la ricezione di un messaggio con Acknowledgment Number=11

3 4 8 11 18 30


Root

eduilitcom

edu

uclanjit

it

politocnreni

il

accomi

com

gscnnkodakbn

polito

wwwnetgrouppop

eni

wwwftpmail

ac

haifatechnion

co

lynxicq


132.

68.7

.8

Root

eduilitcom

il

accomi

com

gscnnkodakbn

ac

haifatechnion

co

lynxicq

tilie.polito.it

ftp.te

chnion.ac.il

?

technion

wwwftpmail

ftp

.tec

hn

ion

.ac.

il?

ftp.technion.ac.il?

ftp.te

chni

on.a

c.il?

ftp.technion.ac.il?

it

politocnreni

polito

wwwnetgrouppop

eni

wwwftpmail

132.68.7.8 132.68.7.8

132.

68.7

.8

132.68.7.8

2

1

3

4

6

5

7

8

9

10


DHCP Client

DHCP Server

Base dati diindirizzi IP

Ho bisogno di configurazione

Ecco il tuo indirizzo,

netmask ...


DHCPofferDHCPoffer

DHCPdiscoverDHCPdiscover

DHCPackDHCPack

DHCPrequestDHCPrequest

192.168.10.105

000102-0CF9AA195.31.235.220

00D0B7-4D9EB3


Router YRouter X

WAN(routing dinamico su rete magliata)

Host 10.1.1.10Def. GTW 10.1.1.5

Host 10.1.1.24Def. GTW 10.1.1.5

10.1.1.1 10.1.1.2

Router-X> interface ethernet 0Router-X> Ip address 10.1.1.1 255.255.255.0Router-X> standby 24 ip 10.1.1.5

HSRP Group 24

Router-Y> interface ethernet 0Router-Y> Ip address 10.1.1.2 255.255.255.0Router-Y> standby 24 ip 10.1.1.5


Router YStandby

Router XActive

WAN(routing dinamico su rete magliata)

Host 10.1.1.10Def. GTW 10.1.1.5

Host 10.1.1.24Def. GTW 10.1.1.5

10.1.1.110.1.1.5

10.1.1.2

Router-X> interface ethernet 0Router-X> Ip address 10.1.1.1 255.255.255.0Router-X> standby 24 preemptRouter-X> standby 24 priority 105Router-X> standby 24 ip 10.1.1.5

HSRP Group 24

Router-Y> interface ethernet 0Router-Y> Ip address 10.1.1.2 255.255.255.0Router-Y> standby 24 preemptRouter-Y> standby 24 ip 10.1.1.5


Router YStandby

Host 10.1.1.28Def. GTW 10.1.1.10

Host 10.1.1.24Def. GTW 10.1.1.10

10.1.1.510.1.1.10 10.1.1.6

R-X>interface ethernet 0R-X-if>Ip address 10.1.1.5 255.255.255.0R-X-if>standby 1 preemptR-X-if>standby 1 priority 105R-X-if>standby 1 ip 10.1.1.10R-X-if>standby 1 track Serial 0R-X-if>no shutdownR-X-if>exitR-X> interface serial 0R-X-if>Ip address 10.6.2.5 255.255.255.0

HSRP Group 1

Host 10.1.1.25Def. GTW 10.1.1.10

Host 10.1.1.31Def. GTW 10.1.1.10

R-Y>interface ethernet 0R-Y-if>Ip address 10.1.1.6 255.255.255.0R-Y-if>standby 1 preemptR-Y-if>standby 1 ip 10.1.1.10R-Y-if>standby 1 track Serial 0R-Y-if>no shutdownR-Y-if>exitR-Y> interface serial 0R-Y-if>Ip address 10.6.7.6 255.255.255.0

Router Z

S0=10.6.2.5 S0=10.6.7.6

Router XActive


Router YActive 2

Standby 1

Host 10.1.1.28Def. GTW 10.1.1.10

Host 10.1.1.24Def. GTW 10.1.1.10

10.1.1.510.1.1.10

10.1.1.610.1.1.20

R-X>interface ethernet 0R-X-if>Ip address 10.1.1.5 255.255.255.0R-X-if>standby 1 preemptR-X-if>standby 1 ip 10.1.1.10R-X-if>standby 1 track Serial 0R-X-if>standby 2 preemptR-X-if>standby 2 ip 10.1.1.20R-X-if>standby 2 track serial 0R-X-if>standby 2 priority 95

HSRP Group 1HSRP Group 2

Host 10.1.1.205Def. GTW 10.1.1.20

Host 10.1.1.206Def. GTW 10.1.1.20

R-Y>interface ethernet 0R-Y-if>Ip address 10.1.1.6 255.255.255.0R-Y-if>standby 1 preemptR-Y-if>standby 1 ip 10.1.1.10R-Y-if>standby 1 track Serial 0R-Y-if>standby 1 priority 95R-Y-if>standby 2 preemptR-Y-if>standby 2 ip 10.1.1.20R-Y-if>standby 2 track serial 0

Router Z

S0=10.6.2.5 S0=10.6.7.6

Router XActive 1

Standby 2


Version Op Code State Hello-time

Hold-time Priority Group Reserved

Authentication Data

Authentication Data

Virtual IP Address

HEADERMAC

FCSHEADER

IPHEADER

UDPPacchetto HSRP


Vers = 2 Virtual Router ID Priority Count Ip Addrs

Auth Type Advers Interval Checksum

Authentication Data (1)

Authentication Data (2)

Virtual IP Address 1

HEADERMAC

FCSHEADER

IPPacchetto VRRP

Type = 1

...Virtual IP Address n


Router YBackup oStandby

Router XMaster o

Active

WAN(routing dinamico su rete magliata )


Router YMaster o

Active

Router XInit


guasto


Router YInit

Router XMaster o

Active


guasto


Router YMaster o

Active

Router XMaster o

Active


guasto


Router YBackup oStandby

Router XMaster o

Active


RSTP/STP

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Switched LAN - Mario Baldi, Pietro Nicoletti Copyright © 2002 - The McGraw-Hill Companies srl...

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