昨天做的是静态路由的配置，按照Boson NetSim上面写的实验计划，后面还有一系列的实验，如下图所示：cisco路由器基本实验之二 默认路由的配置（Boson NetSim）昨天做的就是Laber4 静态路由的配置，今天则是Laber5，默认路由的配置，还是和昨天一样，我把关键语句的意思即理解写在了这些语句的后面，下面是我的配置情况：

   拓扑图还是昨天那幅图：
cisco路由器基本实验之二 默认路由的配置（Boson NetSim）
具体配置如下：
r1的配置：
 
Press Enter to Start

Router>
Router>en
Router#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#hostname router1
router1(config)#interface e0
router1(config-if)#ip address 192.168.1.2 255.255.255.0
router1(config-if)#no shut
%LINK-3-UPDOWN: Interface Ethernet0, changed state to up
router1(config-if)#interface s0
router1(config-if)#ip address 192.168.2.1 255.255.255.0
router1(config-if)#clock rate 6400
router1(config-if)#no shut
%LINK-3-UPDOWN: Interface Serial0, changed state to up
router1(config-if)#exit
%LINK-3-UPDOWN: Interface Serial0, changed state to down
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to down
router1(config)#ip route 0.0.0.0 0.0.0.0 192.168.2.1
router1(config)#ip classless
                    ^
% Invalid input detected at '^' marker.            //可能是路由器型号太低或者是模拟软件的bug，ip classless无效
router1(config-if)#exit
router1(config)#exit
router1#copy running startup
Destination filename [startup-config]?
Building configuration...
[OK]
%LINK-3-UPDOWN: Interface Serial0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0, changed state to up
 
r2 的配置：
 
Press Enter to Start

Router>en
Router#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#interface s0
Router(config-if)#ip address 192.168.2.2 255.255.255.0
Router(config-if)#no shut
%LINK-3-UPDOWN: Interface Serial0, changed state to up
Router(config-if)#interface e0
Router(config-if)#ip address 192.168.3.1 255.255.255.0
Router(config-if)#no shut
%LINK-3-UPDOWN: Interface Ethernet0, changed state to up
Router(config-if)#exit
Router(config)#ip route 0.0.0.0 0.0.0.0 192.168.2.2
Router(config)#exit
Router#copy running startup
Destination filename [startup-config]?
Building configuration...
[OK]
Router#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#hostname router2                   //不好意思，刚开始忘了设主机名了
router2(config)#exit
router2#ping 192.168.1.2                          //先试ping下路由，显示成功
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
 
pc1的配置：
 
Boson BOSS 5.0
Copyright 1998-2003 Boson Software, Inc.
Use the command help to get started
Press Enter to begin
C:>ipconfig /ip 192.168.1.1 255.255.255.0
C:>ipconfig /dg 192.168.1.2
C:>ping 192.168.3.2                             //开始测试，显示完全成功
Pinging 192.168.3.2 with 32 bytes of data:
Reply from 192.168.3.2: bytes=32 time=60ms TTL=241
Reply from 192.168.3.2: bytes=32 time=60ms TTL=241
Reply from 192.168.3.2: bytes=32 time=60ms TTL=241
Reply from 192.168.3.2: bytes=32 time=60ms TTL=241
Reply from 192.168.3.2: bytes=32 time=60ms TTL=241
Ping statistics for 192.168.3.2:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 50ms, Maximum =  60ms, Average =  55ms
C:>ping 192.168.3.1
Pinging 192.168.3.1 with 32 bytes of data:
Reply from 192.168.3.1: bytes=32 time=60ms TTL=241
Reply from 192.168.3.1: bytes=32 time=60ms TTL=241
Reply from 192.168.3.1: bytes=32 time=60ms TTL=241
Reply from 192.168.3.1: bytes=32 time=60ms TTL=241
Reply from 192.168.3.1: bytes=32 time=60ms TTL=241
Ping statistics for 192.168.3.1:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 50ms, Maximum =  60ms, Average =  55ms
C:>ping 192.168.2.2
Pinging 192.168.2.2 with 32 bytes of data:
Reply from 192.168.2.2: bytes=32 time=60ms TTL=241
Reply from 192.168.2.2: bytes=32 time=60ms TTL=241
Reply from 192.168.2.2: bytes=32 time=60ms TTL=241
Reply from 192.168.2.2: bytes=32 time=60ms TTL=241
Reply from 192.168.2.2: bytes=32 time=60ms TTL=241
Ping statistics for 192.168.2.2:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 50ms, Maximum =  60ms, Average =  55ms
C:>ping 192.168.2.1
Pinging 192.168.2.1 with 32 bytes of data:
Reply from 192.168.2.1: bytes=32 time=60ms TTL=241
Reply from 192.168.2.1: bytes=32 time=60ms TTL=241
Reply from 192.168.2.1: bytes=32 time=60ms TTL=241
Reply from 192.168.2.1: bytes=32 time=60ms TTL=241
Reply from 192.168.2.1: bytes=32 time=60ms TTL=241
Ping statistics for 192.168.2.1:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 50ms, Maximum =  60ms, Average =  55ms
C:>ping 192.168.1.2
Pinging 192.168.1.2 with 32 bytes of data:
Reply from 192.168.1.2: bytes=32 time=60ms TTL=241
Reply from 192.168.1.2: bytes=32 time=60ms TTL=241
Reply from 192.168.1.2: bytes=32 time=60ms TTL=241
Reply from 192.168.1.2: bytes=32 time=60ms TTL=241
Reply from 192.168.1.2: bytes=32 time=60ms TTL=241
Ping statistics for 192.168.1.2:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 50ms, Maximum =  60ms, Average =  55ms
C:>ping 192.168.1.1
Pinging 192.168.1.1 with 32 bytes of data:
Reply from 192.168.1.1: bytes=32 time=60ms TTL=241
Reply from 192.168.1.1: bytes=32 time=60ms TTL=241
Reply from 192.168.1.1: bytes=32 time=60ms TTL=241
Reply from 192.168.1.1: bytes=32 time=60ms TTL=241
Reply from 192.168.1.1: bytes=32 time=60ms TTL=241
Ping statistics for 192.168.1.1:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 50ms, Maximum =  60ms, Average =  55ms
pc2的配置：
 
Boson BOSS 5.0
Copyright 1998-2003 Boson Software, Inc.
Use the command help to get started
Press Enter to begin
C:>ipconfig /ip 192.168.3.2 255.255.255.0
C:>ipconfig /dg 192.168.3.1
C:>ping 192.168.1.1                          //正式开始检测，显示实验完全成功
Pinging 192.168.1.1 with 32 bytes of data:
Reply from 192.168.1.1: bytes=32 time=60ms TTL=241
Reply from 192.168.1.1: bytes=32 time=60ms TTL=241
Reply from 192.168.1.1: bytes=32 time=60ms TTL=241
Reply from 192.168.1.1: bytes=32 time=60ms TTL=241
Reply from 192.168.1.1: bytes=32 time=60ms TTL=241
Ping statistics for 192.168.1.1:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 50ms, Maximum =  60ms, Average =  55ms
C:>ping 192.168.1.2
Pinging 192.168.1.2 with 32 bytes of data:
Reply from 192.168.1.2: bytes=32 time=60ms TTL=241
Reply from 192.168.1.2: bytes=32 time=60ms TTL=241
Reply from 192.168.1.2: bytes=32 time=60ms TTL=241
Reply from 192.168.1.2: bytes=32 time=60ms TTL=241
Reply from 192.168.1.2: bytes=32 time=60ms TTL=241
Ping statistics for 192.168.1.2:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 50ms, Maximum =  60ms, Average =  55ms
C:>ping 192.168.2.1
Pinging 192.168.2.1 with 32 bytes of data:
Reply from 192.168.2.1: bytes=32 time=60ms TTL=241
Reply from 192.168.2.1: bytes=32 time=60ms TTL=241
Reply from 192.168.2.1: bytes=32 time=60ms TTL=241
Reply from 192.168.2.1: bytes=32 time=60ms TTL=241
Reply from 192.168.2.1: bytes=32 time=60ms TTL=241
Ping statistics for 192.168.2.1:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 50ms, Maximum =  60ms, Average =  55ms
C:>ping 192.168.2.2
Pinging 192.168.2.2 with 32 bytes of data:
Reply from 192.168.2.2: bytes=32 time=60ms TTL=241
Reply from 192.168.2.2: bytes=32 time=60ms TTL=241
Reply from 192.168.2.2: bytes=32 time=60ms TTL=241
Reply from 192.168.2.2: bytes=32 time=60ms TTL=241
Reply from 192.168.2.2: bytes=32 time=60ms TTL=241
Ping statistics for 192.168.2.2:     Packets: Sent = 5, Received = 5, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 50ms, Maximum =  60ms, Average =  55ms
C:>
  默认路由的配置就到此成功了，总结一下，关键语句是：
ip route 0.0.0.0 0.0.0.0 下一跳IP地址，希望大家都能实验成功！