7 Interconnecting Networks with TCPIP.ppt

1、Interconnecting Networks with TCPIP,Early protocol suite Universal,Introduction to TCP/IP,Host,Internet,TCP/IP,Host,TCP/IP Protocol Stack,Application,Presentation,Session,Transport,Network,Data Link,Physical,Application,Transport,Internet,Data Link,Physical,Application Layer Overview,*Used by the ro

2、uter,Application,Transport,Internet,Data Link,Physical,File Transfer - TFTP * - FTP * - NFS E-Mail - SMTP Remote Login - Telnet * - rlogin * Network Management - SNMP * Name Management - DNS*,Transport Layer Overview,Transmission Control Protocol (TCP) User Datagram Protocol (UDP),Application,Transp

3、ort,Internet,Data Link,Physical,Connection-OrientedConnectionless,TCP Segment Format,Source port (16),Destination port (16),Sequence number (32),Headerlength (4),Acknowledgement number (32),Reserved (6),Code bits (6),Window (16),Checksum (16),Urgent (16),Options (0 or 32 if any),Data (varies),20Byte

4、s,Bit 0,Bit 15,Bit 16,Bit 31,Port Numbers,TCP,Port Numbers,FTP,TransportLayer,TELNET,DNS,SNMP,TFTP,SMTP,UDP,ApplicationLayer,21,23,25,53,69,161,RIP,520,TCP Port Numbers,Source Port,Dest. Port,Host A,1028,23,SP,DP,Host Z,Telnet Z,Dest. port = 23.Send packet to my Telnet application.,Send SYN (seq=100

5、 ctl=SYN),SYN received,Host A,Host B,TCP Three Way Handshake/Open Connection,Send SYN (seq=100 ctl=SYN),SYN received,Send SYN, ACK (seq=300 ack=101 ctl=syn,ack),Host A,Host B,SYN received,TCP Three Way Handshake/Open Connection,Send SYN (seq=100 ctl=SYN),SYN received,Send SYN, ACK (seq=300 ack=101 c

6、tl=syn,ack),Established (seq=101 ack=301 ctl=ack),Host A,Host B,SYN received,TCP Three Way Handshake/Open Connection,TCP Simple Acknowledgment,Window size = 1,Sender,Receiver,TCP Simple Acknowledgment,Window size = 1,Sender,Receiver,Send 1,Receive 1,TCP Simple Acknowledgment,Window size = 1,Sender,R

7、eceiver,Send 1,Receive 1,Receive ACK 2,Send ACK 2,TCP Simple Acknowledgment,Window size = 1,Sender,Receiver,Send 1,Receive 1,Receive ACK 2,Send ACK 2,Send 2,Receive 2,TCP Simple Acknowledgment,Window size = 1,Sender,Receiver,Send 1,Receive 1,Receive ACK 2,Send ACK 2,Send 2,Receive 2,Receive ACK 3,Se

8、nd ACK 3,TCP Simple Acknowledgment,Window size = 1,Sender,Receiver,Send 1,Receive 1,Receive ACK 2,Send ACK 2,Send 2,Receive 2,Receive ACK 3,Send ACK 3,Send 3,Receive 3,Window size = 1,Sender,Receiver,Send 1,Receive 1,Receive ACK 2,Send ACK 2,Send 2,Receive 2,Receive ACK 3,Send ACK 3,Send 3,Receive 3

9、,Receive ACK 4,Send ACK 4,TCP Simple Acknowledgment,TCP Sequence and Acknowledgment Numbers,Source Port,Dest. Port,Sequence #,Acknowledgement #,Source,Dest.,Seq.,Ack.,1028,23,10,1,I just sent #10.,TCP Sequence and Acknowledgment Numbers,I just got #10, now I need #11.,Source Port,Dest. Port,Sequence

10、 #,Acknowledgement #,1028,23,Source,Dest.,10,Seq.,1,Ack.,1028,23,Source,Dest.,11,Seq.,1,Ack.,I just sent #10.,TCP Sequence and Acknowledgment Numbers,Source Port,Dest. Port,Sequence #,Acknowledgement #,1028,23,Source,Dest.,11,Seq.,2,Ack.,1028,23,Source,Dest.,10,Seq.,1,Ack.,1028,23,Source,Dest.,11,Se

11、q.,1,Ack.,I just got #10, now I need #11.,I just sent #11.,TCP Sequence and Acknowledgment Numbers,Source Port,Dest. Port,Sequence #,Acknowledgement #,1028,23,Source,Dest.,11,Seq.,2,Ack.,1028,23,Source,Dest.,10,Seq.,1,Ack.,1028,23,Source,Dest.,11,Seq.,1,Ack.,1028,23,Source,Dest.,12,Seq.,2,Ack.,I jus

12、t got #11, now I need #12.,I just sent #11.,TCP Windowing,Sender,Receiver,TCP Windowing,Window size = 3 Send 2,Sender,Receiver,Window size = 3 Send 1,Window size = 3 Send 3,Window size = 3 Send 2,TCP Windowing,Sender,Window size = 3 Send 1,Window size = 3 Send 3,ACK 3 Window size = 2,Packet 3 isDrop

13、ped,Receiver,Window size = 3 Send 2,TCP Windowing,Sender,Window size = 3 Send 1,Window size = 3 Send 3,ACK 3 Window size = 2,Packet 3 isDropped,Window size = 3 Send 4,Window size = 3 Send 3,Receiver,Window size = 3 Send 2,TCP Windowing,Sender,Window size = 3 Send 1,Window size = 3 Send 3,ACK 3 Windo

14、w size = 2,Packet 3 isDropped,Window size = 3 Send 4,Window size = 3 Send 3,ACK 5 Window size = 2,Receiver,No sequence or acknowledgment fields,UDP Segment Format,Source port (16),Destination port (16),Length (16),Data (if any),1,Bit 0,Bit 15,Bit 16,Bit 31,Checksum (16),8Bytes,Internet Layer Overvie

15、w,OSI network layer corresponds to the TCP/IP internet layer,Internet Protocol (IP) Internet Control Message Protocol (ICMP) Address Resolution Protocol (ARP) Reverse Address Resolution Protocol (RARP),Application,Transport,Internet,Data Link,Physical,IP Datagram,Version(4),Destination IP Address (3

16、2),Options (0 or 32 if any),Data (varies if any),1,Bit 0,Bit 15,Bit 16,Bit 31,HeaderLength (4),Priority & Type of Service (8),Total Length (16),Identification (16),Flags(3),Fragment offset (13),Time to live (8),Protocol (8),Header checksum (16),Source IP Address (32),20Bytes,Determines destination u

17、pper-layer protocol,Protocol Field,TransportLayer,InternetLayer,TCP,UDP,ProtocolNumbers,IP,17,6,Internet Control Message Protocol,Application,Transport,Internet,Data Link,Physical,Destination Unreachable Echo (Ping) Other,ICMP,1,Address Resolution Protocol,,,IP: = ?,I

18、need the Ethernet address of .,Address Resolution Protocol,,,IP: = ?,Address Resolution Protocol,,IP: Ethernet: 0800.0020.1111,,IP: = ?,Address Resolution Protocol,Map IP Ethernet Local ARP,,IP: Ethernet: 0800.0020.1111,,IP: = ?,Reverse ARP,Ethernet: 0800.0020.1111 IP = ?,What is my IP address?,R