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Practical Exercise 3-2 Solution

Configure the async interface corresponding to the AUX port. Use the show line command to determine which async interface corresponds to the AUX port. Make sure the IP addresses on the AUX ports of both routers are in the same subnet. Specify PPP as the encapsulation for the async interface with the encapsulation ppp command. Allow routing protocols on the link with the async dynamic routing command. The encapsulation ppp and async dynamic routing commands are described in greater detail in Chapter 5, "Configuring Point-to-Point Protocol and Controlling Network Access."

Configure the default route to point to the Async1 (AUX port) interface. Configure the line for the AUX port. Allow all protocols to use the line. Set the RX speed (identical to the other router's TX speed). Set the TX speed (identical to the other router's RX speed). The routers' configuration is shown in Example 3-13.

Example 3-13. Routers' Configuration

R1#show running-config
 hostname R1
 !
!
 interface Async1
  ip address 192.168.10.1 255.255.255.0
  encapsulation ppp
  async mode dedicated
 !
 no ip classless
 ip route 0.0.0.0 0.0.0.0 Async1
 logging buffered
 !
 line con 0
  exec-timeout 0 0
 line aux 0
  modem InOut
  transport input all
  speed 38400
  flowcontrol hardware
 line vty 0 4
 !
 end
________________________________________________________________
R2#show running-config
 hostname Router2
 !
 interface Ethernet0
  ip address 10.1.1.1 255.255.255.0
 !

 interface Async1
  ip address 192.168.10.2 255.255.255.0
  encapsulation ppp
  async mode dedicated
 !
 no ip classless
 ip route 0.0.0.0 0.0.0.0 Ethernet0
 logging buffered
 !
 line con 0
  exec-timeout 0 0
 line aux 0
  modem InOut
  transport input all
  speed 38400
  flowcontrol hardware
 line vty 0 4

 !
 end

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