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This chapter is from the book

Troubleshooting Exercises

  1. Identify the mistake in the configuration in Example 4-33.

    Example 4-33 Configuration for Troubleshooting Exercise 1

    ip nat pool EX1 192.168.1.1 192.168.1.254 netmask 255.255.255.0 type match-host
    ip nat pool EX1A netmask 255.255.255.240
     address 172.21.1.33 172.21.1.38
     address 172.21.1.40 172.21.1.46
    ip nat inside source list 1 pool EX1
    ip nat inside source static 10.18.53.210 192.168.1.1
    ip nat outside source list 2 pool EX1A
    !
    access-list 1 permit 10.0.0.0 0.255.255.255
    access-list 2 permit 192.168.2.0 0.0.0.255
  2. RTR1 in Figure 4-30 connects two internetworks with overlapping addresses.

    Figure 4-30 The Internetwork for Troubleshooting Exercise 2

    NAT is implemented on the router as configured in Example 4-34, but devices cannot communicate across the router. What is wrong?

    Example 4-34 Configuration for Troubleshooting Exercise 2

    interface Ethernet0
     ip address 172.16.10.1 255.255.255.0
     ip nat inside
    !
    interface Ethernet1
     ip address 172.16.255.254 255.255.255.0
     ip nat outside
    !
    router ospf 1
     redistribute static metric 10 metric-type 1 subnets
     network 10.0.0.0 0.255.255.255 area 0
    !
    ip nat translation timeout 500
    ip nat pool NET1 10.1.1.1 10.1.255.254 netmask 255.255.0.0
    ip nat pool NET2 192.168.1.1 192.168.255.254 netmask 255.255.0.0
    ip nat inside source list 1 pool NET1
    ip nat outside source list 1 pool NET2
    !
    ip classless
    !
    ip route 10.1.0.0 255.255.0.0 Ethernet0
    ip route 192.168.0.0 255.255.0.0 Ethernet1
    !
    access-list 1 permit 172.16.0.0 0.0.255.255
  3. Refer to the configurations of Cozumel and Guaymas in Figure 4-21. If the first line of access list 1 in both configurations is removed, what is the result? Can Guaymas and Cozumel still ping each other?

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