Chapter 8 TCP/IP. Chapter Figures

Transcription

1 Chapter 8 TCP/IP Chapter Figures

2 Application Application TCP UDP ICMP IP ARP RARP Network interface Figure 8.

3 HTTP Request Header contains source & destination port numbers TCP header Header contains source and destination IP addresses; transport protocol type IP header Header contains source & destination physical addresses; network protocol type Ethernet header FCS Figure 8.

4 Machine A Application layer Transport layer Internet layer Network interface layer Router/gateway Internet layer Network interface layer Machine B Application layer Transport layer Internet layer Network interface layer Network Network Figure 8.

5 Version IHL Type of service Identification Flags Total length Fragment offset Time to live Protocol Header checksum Source IP address Destination IP address Options Padding Figure 8.4

6 Figure 8.5

7 Bit position: Class A Net ID Host ID Class B 0 Net ID Host ID Class C 0 Net ID Host ID Class D 0 Multicast address Class E Reserved for experiments Figure 8.6

8 Original address 0 Net ID Host ID Subnetted address 0 Net ID Subnet ID Host ID Figure 8.7

9 H H To the rest of the Internet R H H R H Figure 8.8

10 H H H H ARP request (what is the MAC address of ?) H H H H4 ARP response (my MAC address is 08:00:5a:b:94) Figure 8.9

11 Figure 8.0

12 Source Router Destination IP IP Network Network Figure 8.

13 0 8 6 Type Code Checksum Unused IP header and 64 bits of original datagram Figure 8.

14 0 8 6 Type Code Checksum Identifier Sequence number Data Figure 8.

15 Figure 8.4

16 Figure 8.5

17 Version Traffic class Flow label Payload length Next header Hop limit Source address Destination address Figure 8.6

18 Figure 8.7

19 n bits m bits o bits p bits (5-m-n-o-p) bits 00 Registry ID Provider ID Subscriber ID Subnet ID Interface ID Figure 8.8

20 Basic header Next header = TCP TCP segment Basic header Next header = routing Routing header Next header = fragment Fragment header Next header = authentication Authentication header Next header = TCP TCP segment Figure 8.9

21 Next header 0 94 Opt len = 4 Jumbo payload length Figure 8.0

22 Next header Reserved Fragment offset Res M Identification Figure 8.

23 Next header Header length Routing type = 0 Segment left Reserved Strict/loose bit mask Address Address... Address 4 Figure 8.

24 Source Tunnel head-end Tunnel tail-end Destination Tunnel (a) IPv6 network IPv6 header IPv4 network IPv4 header IPv6 network Source Destination Link (b) IPv6 network IPv6 network Figure 8.

25 0 6 Source Port Destination Port UDP Length UDP Checksum Data Figure 8.4

26 0 8 6 Source IP address Destination IP address Protocol = 7 UDP length Figure 8.5

27 Application byte stream Application byte stream Segments Transmitter Receiver Send buffer Receive buffer ACKs Figure 8.6

28 Source port Destination port Sequence number Acknowledgment number Header length Reserved U R G A C K P S H R S T S Y N F I N Window size Checksum Urgent pointer Options Padding Data Figure 8.7

29 0 8 6 Source IP address Destination IP address Protocol = 6 TCP segment length Figure 8.8

30 Host A Host B SYN, Seq_no = x SYN, Seq_no = y, ACK, Ack_no = x+ Seq_no = x+, ACK, Ack_no = y+ Figure 8.9

31 Host A Host B SYN, Seq_no = n SYN, Seq_no = n, ACK, Ack_no = n+ Seq_no = n+, ACK, Ack_no = n+ Delayed segment with Seq_no = n+ will be accepted Figure 8.0

32 Figure 8.

33 socket connect (blocks) connect returns Host A (client) t t t SYN, Seq_no = x SYN, Seq_no = y, ACK, Ack_no = x+ Seq_no = x+, ACK, Ack_no = y+ Host B (server) socket bind listen accept (blocks) write read (blocks) t 5 Request message t 4 accept returns read (blocks) t 6 read returns read returns Reply message write read (blocks) Figure 8.

34 Host A Host B t 0 Seq_no =, Ack_no = 000, Win = 048, No Data t Seq_no = 000, Ack_no =, Win = 04, Data = Seq_no = 04, Ack_no =, Win = 04, Data = t t Seq_no =, Ack_no = 4048, Win = 5, Data = -8 Seq_no = 4048, Ack_no = 9, Win = 04, Data = t 4 Figure 8.

35 Data Header contains source and destination port numbers TCP Header Header contains: source and dest. IP addresses; transport protocol type IP Header Figure 8.4

36 Host A Host B FIN, seq = 5086 Ack = 5087 Data, seq. = 0, Ack=5087 Deliver 50 bytes Ack = 45 FIN, seq. =45, Ack = 5087 Ack = 454 Figure 8.5

37 receive ACK receive ACK receive ACK SYN_RCVD CLOSED active open, create TCB send SYN FIN_WAIT_ FIN_WAIT_ passive open, create TCB LISTEN receive SYN, send SYN, ACK receive RST send SYN ESTABLISHED CLOSING TIME_WAIT SYN_SENT receive SYN, ACK, send ACK receive ACK receive FIN, send ACK application close, send FIN application close, send FIN Application close receive SYN, send ACK application close or timeout, delete TCB CLOSE_WAIT application close send FIN receive FIN send ACK LAST_ACK MSL timeout delete TCB receive FIN send ACK receive FIN, ACK send ACK Figure 8.6

38 0 Congestion avoidance Time-out Congestion window Threshold Slow start 0 Round-trip times Figure 8.7

39 0 8 6 Command Version Zero Address family identifier Zero IP address Zero Zero Metric... Figure 8.8

40 To another AS N R N5 N R R6 N4 R7 R R4 R5 N6 N Area R8 Area Area N7 Area R = router N = network Figure 8.9

41 0 8 6 Version Type Packet length Router ID Area ID Checksum Authentication type OSPF common header Authentication Authentication Data OSPF packet body Figure 8.40

42 0 6 4 Network mask Hello interval Options Priority Dead interval Designated router Backup designated router Neighbor... Neighbor n Figure 8.4

43 Interface MTU Options Zero I M M S Database description sequence number LSA header Figure 8.4

44 0 6 4 Link-state age Options Link-state type Link-state ID Advertising router Link-state sequence number Link-state checksum Length Figure 8.4

45 0 Link-state type Link-state ID Advertising router... Figure 8.44

46 0 Number of LSAs LSA... LSA n Figure 8.45

47 Figure 8.46

48 R R AS AS R R4 AS N Figure 8.47

49 AS AS AS6 AS AS5 AS4 AS7 Figure 8.48

50 R ebgp ebgp R R ibgp R ibgp ibgp ibgp ibgp R ibgp R R ebgp ebgp R Figure 8.49

51 0 6 4 Marker Length Type Figure 8.50

52 Marker Length Type: OPEN Version My autonomous system Hold time BGP identifier Optional parameters length Optional parameters Figure 8.5

53 0 6 4 Marker Length Type: KEEPALIVE Figure 8.5

54 Marker Length Type: NOTIFICATION Error code Error subcode Data Figure 8.5

55 Unfeasible routes length (two octets) Withdrawn routes (variable) Total path attribute length (two octets) Path attributes (variable) Network layer reachability information (variable) Figure 8.54

56 Attribute type Attribute length Attribute value Figure 8.55

57 O T P E 0 Attribute type code Figure 8.56

58 0...0/ R4 AS /4 ibgp R ibgp ebgp R ibgp R AS - Reach 0...0/4 via next hop Reach /4 via next hop Reach 0...0/4 via next hop Reach /4 via next hop Figure 8.57

59 0...0/4 with MED=00 R R AS 0...0/4 with MED=00 R AS Figure 8.58

60 Figure 8.59

61 S G G G G G G G 4 Figure 8.60

62 S G G G G G G G 4 Figure 8.6

63 S G G G G G G G 4 Figure 8.6

64 S G G G G G G G 4 Figure 8.6

65 Version Type Unused Checksum Group address (Class D IP address) Figure 8.64

66 S G G G G G G G 4 Graft message Figure 8.65

67 Foreign network Home network Foreign agent Mobile host Home agent Internet Correspondent host Figure 8.66

68 Outer IP header IP header IP header IP payload IP payload Figure 8.67

69 Foreign network Home network Foreign agent Mobile host Home agent a Internet b 4 Correspondent host Figure 8.68

70 L, R L4, L6,4 R5 L9, R L,4 R4 L7,5 R7 L, L5, R6 L0, R L8,4 Figure for Problem 8.54

71 AS R7 R6 AS R4 R R AS R5 AS6 R9 R8 AS5 R AS4 Figure for Problem 8.6