I protocolli di trasporto e di servizio della famiglia TCP/IP Capitolo 7 I protocolli di trasporto e di servizio della famiglia TCP/IP

Porta numero 2523 4322

Acknowledgement Number Options PAD Checksum Urgent Pointer HLEN Reser. Code Bits Window Acknowledgement Number Sequence Number Source Port Destination Port 32 bit

   130.192.3.29 130.192.5.33 Client Server SYN,SN=18421174 SYN,ACK,SN=1249155681,AN=18421175 SYN,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 Client Server FIN,SN=41635319 4549 Client FIN,ACK,SN=2541997339,AN=41635320 FIN,ACK,SN=41635320,AN=2541997340 FIN,SN=41635319 FIN,SN=2541997339,AN=41635320 Server AN: Acknowledgment Number SN: Sequence Number 110

Byte trasmesso di cui è nota l’avvenuta consegna Byte trasmesso sulla cui consegna non si hanno informazioni Byte non ancora trasmesso Byte non ancora trasmissibile Finestra di trasmissione 3 4 8 11 18 30 Finestra di trasmissione dopo la ricezione di un messaggio con Acknowledgment Number=11

Root edu il it com ucla njit polito cnr eni ac co mi gs cnn kodak bn www netgroup pop ftp mail haifa technion lynx icq

Root tilie.polito.it 132.68.7.8 edu il it com ac co mi gs cnn kodak bn haifa technion lynx icq tilie.polito.it ftp.technion.ac.il? www ftp mail polito cnr eni netgroup pop 2 1 3 4 6 5 7 8 9 10

Ho bisogno di configurazione Ecco il tuo indirizzo, netmask ... DHCP Client DHCP Server Base dati di indirizzi IP Ho bisogno di configurazione Ecco il tuo indirizzo, netmask ...

    DHCPdiscover DHCPoffer DHCPrequest DHCPack 000102-0CF9AA 192.168.10.105 000102-0CF9AA 195.31.235.220 00D0B7-4D9EB3

(routing dinamico su rete magliata) Router Y Router X WAN (routing dinamico su rete magliata) Host 10.1.1.10 Def. GTW 10.1.1.5 Host 10.1.1.24 10.1.1.1 10.1.1.2 Router-X> interface ethernet 0 Router-X> Ip address 10.1.1.1 255.255.255.0 Router-X> standby 24 ip 10.1.1.5 HSRP Group 24 Router-Y> interface ethernet 0 Router-Y> Ip address 10.1.1.2 255.255.255.0 Router-Y> standby 24 ip 10.1.1.5

(routing dinamico su rete magliata) Router Y Standby Router X Active WAN (routing dinamico su rete magliata) Host 10.1.1.10 Def. GTW 10.1.1.5 Host 10.1.1.24 10.1.1.1 10.1.1.5 10.1.1.2 Router-X> interface ethernet 0 Router-X> Ip address 10.1.1.1 255.255.255.0 Router-X> standby 24 preempt Router-X> standby 24 priority 105 Router-X> standby 24 ip 10.1.1.5 HSRP Group 24 Router-Y> interface ethernet 0 Router-Y> Ip address 10.1.1.2 255.255.255.0 Router-Y> standby 24 preempt Router-Y> standby 24 ip 10.1.1.5

Router Y Standby Host 10.1.1.28 Def. GTW 10.1.1.10 Host 10.1.1.24 10.1.1.5 10.1.1.10 10.1.1.6 R-X>interface ethernet 0 R-X-if>Ip address 10.1.1.5 255.255.255.0 R-X-if>standby 1 preempt R-X-if>standby 1 priority 105 R-X-if>standby 1 ip 10.1.1.10 R-X-if>standby 1 track Serial 0 R-X-if>no shutdown R-X-if>exit R-X> interface serial 0 R-X-if>Ip address 10.6.2.5 255.255.255.0 HSRP Group 1 Host 10.1.1.25 Host 10.1.1.31 R-Y>interface ethernet 0 R-Y-if>Ip address 10.1.1.6 255.255.255.0 R-Y-if>standby 1 preempt R-Y-if>standby 1 ip 10.1.1.10 R-Y-if>standby 1 track Serial 0 R-Y-if>no shutdown R-Y-if>exit R-Y> interface serial 0 R-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 X Active

Router Y Active 2 Standby 1 Host 10.1.1.28 Def. GTW 10.1.1.10 Host 10.1.1.24 10.1.1.5 10.1.1.10 10.1.1.6 10.1.1.20 R-X>interface ethernet 0 R-X-if>Ip address 10.1.1.5 255.255.255.0 R-X-if>standby 1 preempt R-X-if>standby 1 ip 10.1.1.10 R-X-if>standby 1 track Serial 0 R-X-if>standby 2 preempt R-X-if>standby 2 ip 10.1.1.20 R-X-if>standby 2 track serial 0 R-X-if>standby 2 priority 95 HSRP Group 1 HSRP Group 2 Host 10.1.1.205 Def. GTW 10.1.1.20 Host 10.1.1.206 R-Y>interface ethernet 0 R-Y-if>Ip address 10.1.1.6 255.255.255.0 R-Y-if>standby 1 preempt R-Y-if>standby 1 ip 10.1.1.10 R-Y-if>standby 1 track Serial 0 R-Y-if>standby 1 priority 95 R-Y-if>standby 2 preempt R-Y-if>standby 2 ip 10.1.1.20 R-Y-if>standby 2 track serial 0 Router Z S0=10.6.2.5 S0=10.6.7.6 Router X Active 1 Standby 2

Version Op Code State Hello-time Hold-time Priority Group Reserved Authentication Data Virtual IP Address HEADER MAC FCS IP UDP Pacchetto HSRP

Authentication Data (1) Authentication Data (2) Vers = 2 Virtual Router ID Priority Count Ip Addrs Auth Type Advers Interval Checksum Authentication Data (1) Authentication Data (2) Virtual IP Address 1 HEADER MAC FCS IP Pacchetto VRRP Type = 1 . Virtual IP Address n

(routing dinamico su rete magliata ) Router Y Backup o Standby Router X Master o Active WAN (routing dinamico su rete magliata )

(routing dinamico su rete magliata ) Router Y Master o Active Router X Init WAN (routing dinamico su rete magliata ) guasto

(routing dinamico su rete magliata ) Router Y Init Router X Master o Active WAN (routing dinamico su rete magliata ) guasto

(routing dinamico su rete magliata ) Router Y Master o Active Router X WAN (routing dinamico su rete magliata ) guasto

(routing dinamico su rete magliata ) Router Y Backup o Standby Router X Master o Active WAN (routing dinamico su rete magliata ) RSTP/STP