cisco路由器基本实验之二 默认路由的配置（Boson NetSim） 
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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：
 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：
 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！
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