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鍵結層. 靜宜大學資工系 蔡奇偉 2006. 大綱. 乙太網路 (Ethernet) SLIP CSLIP PPP 與 PPPoE Loopback MTU 序列線產能的計算. 乙太網路 (Ethernet). 1982 年由 DEC 、 Intel 及 Xerox 所提出。 匯流排架構 採用 CSMA/CD 的存取方式。 資料傳輸率為 10Mbps, 100Mbps 或 1Gbps 。 採用 48 位元的位址。 定義在 IEEE 802.3 標準。 封裝標準: RFC 894 與 RFC 1042.

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2006


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  • (Ethernet)

  • SLIP

  • CSLIP

  • PPP PPPoE

  • Loopback

  • MTU


Ethernet

(Ethernet)

  • 1982 DECIntel Xerox

  • CSMA/CD

  • 10Mbps, 100Mbps 1Gbps

  • 48

  • IEEE 802.3

  • RFC 894 RFC 1042


Csma cd

CSMA/CD

Carrier Sense Multiple Access with Collision Detection


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  • CSMA/CD

    • 1. ()

    • 2. () ()

    • 3.


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CSMA/CD (collision domain) ()

/

/

520 10 Mbps2500


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  • IEEE 802.3

  • LLC(logical link control, )

  • MAC(media access control, )

    • CSMA/CDMAC LLC


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  • SNAP

    • Sub-network Access Protocol

  • DSAP

    • Destination Service Access Point

  • SSAP

    • Source Service Access Point


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(RFC 894)

6

6

/15181536

46 1500 46 1500

CRC 4 CRC-32


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PC (Network Interface Card, NIC)NIC 48 16 :

07-OI-02-01-2C-4B


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  • (unicast address)

    • 0

  • (multicast address)

    • 1

  • (broadcast address)

    • 48 1

  • () () (LAN )


Slip serial line ip

IP

c0

db

db

dc

db

dd

END

SLIP (Serial Line IP)

  • IP

  • RFC 1055

  • IP END (0xc0)

  • 0xc0 0xdb (SLIP ESC)

    • 0xc0 0xdb 0xdc

    • oxdb 0xdb 0xdd


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SLIP

  • IP IP

  • SLIP

  • SLIP SLIP


Cslip compressed slip

CSLIP (Compressed SLIP)

  • RFC 1144

  • IP 20 IP 20 TCP

  • CSLIP 40 3 5


Ppp point to point protocol

PPP (Point-to-Point Protocol)

  • IP PPP 8

  • (Link Control Protocol, LCP)

  • (Network Control Protocol, NCP) IPOSI DECnet AppleTalk

  • RFC 1548 RFC 1332


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1500

PPP


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0x7E

bit stuffing


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8

7

6

5

4

3

2

1

0 1, 1 0

1. 6

2. ESC 0x7d

3. 0x7e, 0x7d, 0x20 ASCII

0x7e 0x7d, 0x5e

0x7d 0x7d, 0x5d

0x01 0x7d, 0x21


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PPP

  • IP

  • CRC

  • IP (IP)

  • TCP IP CSLIP

3 (implementation)


Loopback interface

(Loopback Interface)

( loopback) TCP/IP A ID 127 127.0.0.1 localhost () IP


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loopback IP

IP IP


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MTU ()

  • Maximum Transmission Unit

  • IP MTU IP (fragmentation )( fragment ) MTU


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MTU

  • MTU

  • MTU MTU (path MTU)

  • MTU (route)

  • MTU A B B A MTU


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9600 / 960 /1024 1066msSLIP FTP 1024 533ms (1066ms ) ( interactive packet)

553ms 100-200ms


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SLIP MTU 256 266ms (133 ms) (64128) () 261 5 CSLIP 256 98.1% 1.9% MTU 256


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