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PHN 4:PHN 4: Thit lpThit lp ktkt niniWAN vi PPPWAN vi PPP

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WANWAN

ServiceProvider 

� WANs kt ni nhiu site

� S yêu cu kt ni khác nhau tùy thuc vào yêu cuca khách hàng và chi phi

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Leased Lineng b serial

Telephone

CompanyCircuit-switched

Bt ng b serial,

ISDN L  p 1

Service

Provider Packet-switched

ng b serial

CácCác loiloi ktkt nini WAN:WAN: L  pL  p 11

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K t ni Serial dng im-imK t ni Serial dng im-im

Các kt ni Router 

Các kt ni mng tiCSU/DSU

EIA/TIA-232 EIA/TIA-449 EIA-530V.35 X.21

CSU/DSU

Thit b ucui ca user 

ServiceProvider 

DTE

DCE

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Leased Line

Circuit-switched

PPP, SLIP, HDLC

HDLC, PPP, SLIP

Packet-switched

X.25, Frame Relay, ATM

CácCác giaogiao thcthc óngóng góigói caca WAN:WAN:L  pL  p 22

Telephone

Company

Service

Provider 

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Flag Address Control Data FCS Flag

HDLC

� Cung cp ch mt giao thc môi trng

Flag Address Control Proprietary Data FCS Flag

Cisco HDLC

K hungK hung HDLCHDLC

�

HDLC ca Cisco có mt vùng d liu c trng cung cpnhiu giao thc môi trng

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LnhLnh trongtrong HDLCHDLC

Router(config-if)#encapsulation hdlc

�

Bt tính nng óng gói ca HDLC� HDLC là dng óng gói mc nh trên cng ng b

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óng gói PPPTCP/IP

 Novell IPXAppleTalk 

 Nhiu giao thc óng gói dùng NCPs trong PPP

� PPP có th mang gói tin t mt vài b giao thc dùng Network Control Programs

� PPP iu khin thit lp ca mt s la chn lin kt dùng LCP

Liên kt thit lp và iu khin dùng LCP trong PPP

TngTng quanquan vv PPPPPP

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Synchronous or AsynchronousPhysical Media

Link Control Protocol

Authentication, other options

 Network Control ProtocolPPP

Data Link Layer 

PhysicalLayer 

 Network 

Layer 

IPCP IPXCP Many Others

IP IPX Layer 3 Protocols

ThànhThành phn phn caca PPPPPP

yPPP²Mt liên kt d liu v i dch v ca l  p mng

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Tính nng Cách thc hot ng Giao thc

Xác thc PAP

CHAPThc thi c ch bt tay

òi hi mt mt khu

 Nén Nén d liu ti ngun;gii nén d liu ti ích

Stacker hocPredictor 

K hám phá li

Tránh khung b vòng lp

Quan sát d liu b r  t trên liên kt

Multilink  Cân bng ti trên nhiu liên kt Multilink Protocol (MP)

CuCu hìnhhình PPP LCPPPP LCP

Quality

Magic Number 

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XácXác thcthc PPPPPP

y Hai giao thc xác thc PPP:PAP và CHAP

Xây dng PPP Session1 Giai on xây dng liên kt2 Giai on xác thc (tùy chn)3 Giai on giao thc l  p mng

Dialup or Circuit-Switched

 Network 

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� Mt khu c gi d i dng vn bn

ChnChn lala giaogiao thcthc xácxác thcthc PPPPPP

Remote Router (SantaCruz)

Central-Site Router (HQ)

Hostname: santacruzPassword: boardwalk 

username santacruz password boardwalk 

PAPBt tay 2 b c

 ³santacruz, boardwalk´

Accept/Reject

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ChnChn lala giaogiao thcthc xácxác thcthc PPPPPP

Remote Router (SantaCruz)

Central-Site Router (HQ)

Hostname: santacruzPassword: boardwalk 

username santacruz password boardwalk 

CHAPBt tay 3 b c

Challenge

Response

Accept/Reject

y Dùng ³secret´ c bit ch bi ngi xác thcvà láng ging.

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CuCu hìnhhình PPPPPP vàvà xácxác thcthc

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CuCu hìnhhình PPPPPP vàvà xácxác thcthc

RouterX(config-if)# encapsulation ppp

Bt tính nng óng gói PPP

Rou

terX(co

nfig)# ho

stname name

Gán tên cho router 

RouterX(config)# username name password  password 

Xác nhn tên và mt khu ca router láng ging

RouterX(config-if)# ppp authentication{chap | chap pap | pap chap | pap}

Bt tính nng xác thc PAP hoc CHAP

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VíVí dd vv cucu hìnhhình PPPPPP vàvà CHAPCHAP

hostname RouterXusername RouterY password sameone!int serial 0ip address 10.0.1.1 255.255.255.0encapsulation pppppp authentication chap

hostname RouterYusername RouterX password sameone!int serial 0ip address 10.0.1.2 255.255.255.0encapsulation pppppp authentication chap

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K imK im tratra cucu hìnhhình óngóng góigói PPPPPP

RouterX# show interface s0Serial0 is up, line protocol is upHardware is HD64570Internet address is 10.140.1.2/24MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255Encapsulation PPP, loopback not set, keepalive set (10 sec)LCP Open

Open: IPCP, CDPCPLast input 00:00:05, output 00:00:05, output hang neverLast clearing of "show interface" counters neverQueueing strategy: fif oOutput queue 0/40, 0 drops; input queue 0/75, 0 drops5 minute input rate 0 bits/sec, 0 packets/sec5 minute output rate 0 bits/sec, 0 packets/sec

38021 packets input, 5656110 bytes, 0 no bufferR eceived 23488 broadcasts, 0 runts, 0 giants, 0 throttles0 input errors, 0 CR C, 0 frame, 0 overrun, 0 ignored, 0 abort38097 packets output, 2135697 bytes, 0 underruns0 output errors, 0 collisions, 6045 interface resets0 output buffer failures, 0 output buffers swapped out482 carrier transitionsDCD=up DSR =up DTR =up R TS=up CTS=up

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XácXác minhminh c c chch xácxác thcthc caca PPPPPP

RouterX# debug ppp authentication4d20h: %LINK-3-UPDOWN: Interface Serial0, changed state to up4d20h: Se0 PPP: Treating connection as a dedicated line4d20h: Se0 PPP: Phase is AUTHENTICATING, by both4d20h: Se0 CHAP: O CHALLENGE id 2 len 28 from ´left"4d20h: Se0 CHAP: I CHALLENGE id 3 len 28 from ´right"4d20h: Se0 CHAP: O R ESPONSE id 3 len 28 from ´left"

4d20h: Se0 CHAP: I R ESPONSE id 2 len 28 from ´right"4d20h: Se0 CHAP: O SUCCESS id 2 len 44d20h: Se0 CHAP: I SUCCESS id 3 len 44d20h: %LINEPR OTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to up

Lnh debug ppp authentication cho thy CHAP xác thc thành công

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XácXác minhminh ss thngthng lnglng caca PPPPPP

RouterX# debug ppp negotiationPPP protocol negotiation debugging is onRouterX#*Mar 1 00:06:36.645: %LINK-3-UPDOWN: Interface BR I0:1, changed state to up*Mar 1 00:06:36.661: BR 0:1 PPP: Treating connection as a callin*Mar 1 00:06:36.665: BR 0:1 PPP: Phase is ESTABLISHING, Passive Open

*Mar 1 00:06:36.669: BR 0:1 LCP: State is Listen*Mar 1 00:06:37.034: BR 0:1 LCP: I CONFR EQ [Listen] id 7 len 17*Mar 1 00:06:37.038: BR 0:1 LCP: AuthProto PAP (0x0304C023)*Mar 1 00:06:37.042: BR 0:1 LCP: MagicNumber 0x507A214D (0x0506507A214D)*Mar 1 00:06:37.046: BR 0:1 LCP: Callback 0 (0x0D0300)*Mar 1 00:06:37.054: BR 0:1 LCP: O CONFR EQ [Listen] id 4 len 15*Mar 1 00:06:37.058: BR 0:1 LCP: AuthProto CHAP (0x0305C22305)*Mar 1 00:06:37.062: BR 0:1 LCP: MagicNumber 0x1081E7E1 (0x05061081E7E1)

*Mar 1 00:06:37.066: BR 0:1 LCP: O CONFR EJ [Listen] id 7 len 7*Mar 1 00:06:37.070: BR 0:1 LCP: Callback 0 (0x0D0300)*Mar 1 00:06:37.098: BR 0:1 LCP: I CONFACK [R EQsent] id 4 len 15*Mar 1 00:06:37.102: BR 0:1 LCP: AuthProto CHAP (0x0305C22305)*Mar 1 00:06:37.106: BR 0:1 LCP: MagicNumber 0x1081E7E1 (0x05061081E7E1)*Mar 1 00:06:37.114: BR 0:1 LCP: I CONFR EQ [ACKrcvd] id 8 len 14*Mar 1 00:06:37.117: BR 0:1 LCP: AuthProto PAP (0x0304C023)*Mar 1 00:06:37.121: BR 0:1 LCP: MagicNumber 0x507A214D (0x0506507A214D)

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TngTng ktkt

PPP là mt giao thc l  p 2 ph bin cho mng WAN.PPP gm hai thành phn chính: LCP dùng thnglng s kt ni và NCP dùng óng gói lung dliu.

Có th cu hình PPP dùng PAP hoc CHAP. PAPgi mi th dng vn bn. CHAP dùng mt hàm bmMD5.

Lnh xác minh PPP ph bin gm show interface

xác minh óng gói PPP và debu

g ppp nego

tiatio

n xác minh bt tay LCP.

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