Trouble-Shooting Scenario
添加时间: 2007-9-3 22:27:52 作者: Cisco认证考试 阅读次数:45 来源: http://www.d9soft.com
Upon return from lunch you notice something strange!
Router_B#telnet Router_A
Trying Router_A (192.13.10.10)... Open
User Access Verification
Password:
Router_B>
Router_B#sh sess
Conn Host Address Byte Idle Conn Name
* 1 router_a 192.13.10.10 0 0 router_a
- What is the problem? - What is the most likely cause of the problem?
- Based on the previous answer, what is the solution to our dilemma?
Explanation:
The problem is that when a telnet session is initiated from Router_B to Router_A, we end up back at Router_B!
The most likely cause is a misconfigured host table.
The solution is to correct the host table. Make sure that the address used to identify Router_A is actually an interface of Router_A.
Review the configurations below and make the necessary changes.
Router_B
Router_B#sh run
Building configuration...
Current configuration:
!
version 11.3
no service password-encryption
hostname Router_B
!
ip host Router_A 192.13.10.10 172.16.10.1
interface Serial0
ip address 192.13.10.10 255.255.255.252
no ip mroute-cache
no fair-queue
clockrate 4000000
!
interface Serial1
no ip address
shutdown
!
interface Serial2
no ip address
shutdown
!
interface Serial3
no ip address
shutdown
!
interface TokenRing0
ip address 20.20.20.1 255.255.255.0 secondary
ip address 172.16.11.1 255.255.255.0
bandwidth 4000000
ring-speed 16
!
interface BRI0
no ip address
shutdown
!
router rip
network 192.13.10.0
network 20.0.0.0
network 192.13.20.0
!
ip classless
!
line con 0
line aux 0
line vty 0 4
password ccna
login
!
end
Router_A
Router_A#sh run
Building configuration...
Current configuration:
!
version 11.2
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname Router_A
!
interface Ethernet0
ip address 172.16.10.1 255.255.255.0
!
interface Ethernet1
no ip address
shutdown
!
interface Serial0
ip address 192.13.10.9 255.255.255.252
no fair-queue
interface Serial1
no ip address
shutdown
!
router rip
network 192.13.10.0
network 172.16.0.0
!
ip classless
ip route 0.0.0.0 255.255.255.255 192.13.10.1
!
line con 0
line aux 0
line vty 0 4
login
!
end
The following configuration line of Router_A
ip host Router_A 192.13.10.10 172.16.10.1
Should be:
ip host Router_A 192.13.10.9 172.16.10.1
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