Configuration of PAP Verification Method for ccna network series experiments (2)

Based on security considerations, many companies may use the Wide Area Network Technology for Intranet Communication.

 

Lan	Wan
Network cable	Serial Line
Transmission Distance near	Long Transmission Distance
<100 m	> 1000 m
Asynchronous transmission	Synchronous Transmission
Fast transmission speed	Slow transmission speed

 

To achieve synchronous transmission, a clock frequency must be provided by DCE.

① DTE: data communication device, generally on the user end

② DCE: data communication equipment, usually on the operator

 

PPP is widely used for WAN connection.

PPP (Point-to-Point Protocol) supports point-to-point authentication. The authentication methods include pap and chap.

In real life, it is mainly pap. Once authenticated, it can be used directly next time, eliminating the need for bandwidth occupation and traffic waste.

PAP	Chap
Secondary handshake	Three-way handshake
Plaintext Password	Ciphertext Password
Request initiated by the client	Request initiated by the server

 

The following are the configuration cases of PAP:

Network Topology:

PAP client:

R1#ping 10.10.10.2Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 16/40/84 ms

PAP Server Configuration:

R2#enR2#conf tEnter configuration commands, one per line.  End with CNTL/Z.R2(config)#usR2(config)#username  oracle passR2(config)#username  oracle password oracleR2(config)#int s0/0R2(config-if)#enR2(config-if)#encapsulation  pppR2(config-if)#ppp*Mar  1 00:04:14.835: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to downR2(config-if)#ppp authenR2(config-if)#ppp authentication  papR2(config-if)#no shR2(config-if)#end

PAP client Configuration:

R1#ping 10.10.10.2Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2 seconds:...*Mar  1 00:04:43.303: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down..Success rate is 0 percent (0/5)

Ping failed before the PAP client is configured

R1#conf tEnter configuration commands, one per line.  End with CNTL/Z.R1(config)#int s0/0R1(config-if)#encR1(config-if)#encapsulation  pppR1(config-if)#ppp pap seR1(config-if)#ppp pap sent-username  oracle paR1(config-if)#ppp pap sent-username  oracle password  oracleR1(config-if)#no*Mar  1 00:07:20.415: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0 changed state to upR1(config-if)#no shR1(config-if)#endR1#ping*Mar  1 00:07:29.311: %SYS-5-CONFIG_I: Configured from console by consoleR1#ping 10.10.10.2Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 10.10.10.2, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 20/64/132 ms