IT傻博士 2008-2-16 16:39
实验:浮动静态路由
实验：浮动静态路由
在看np的高级路由的时候书中有一个浮动静态路由的实验，我用远程的台子做了一下这个实验。
拓扑图
(r2)
/
/ ;
/ ;
(r1)--------(r3)
r1 s1/0:1.1.1.1/24 s2/0:10.1.1.1/24
r2 s1/0:2.2.2.2/24 s2/0:1.1.1.2/24
r3 s1/0:10.1.1.3/24 s2/0:2.2.2.3/24
配置如下：
r1
hostname 1
!
interface Serial1/0
ip address 1.1.1.1 255.255.255.0
clockrate 64000
!
interface Serial2/0
ip address 10.1.1.1 255.255.255.0
!
ip route 2.0.0.0 255.0.0.0 10.1.1.3
r2
hostname 2
!
interface Serial1/0
ip address 2.2.2.2 255.255.255.0
clockrate 64000
!
interface Serial2/0
ip address 1.1.1.2 255.255.255.0
!
ip route 10.0.0.0 255.0.0.0 1.1.1.1
ip route 10.0.0.0 255.0.0.0 2.2.2.3 10 /手动添加的一条浮动路由，管理距离为10/
r3
hostname 3
!
interface Serial1/0
ip address 10.1.1.3 255.255.255.0
clockrate 64000
!
interface Serial2/0
ip address 2.2.2.3 255.255.255.0
!
ip classless
ip route 1.0.0.0 255.0.0.0 10.1.1.1
我从r2上ping10.1.1.3,为了更好的看效果我添加了访问控制列表。
r2的路由表:
2#show ip route
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Serial2/0
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Serial1/0
S 10.0.0.0/8 [1/0] via 1.1.1.1
2(config)#access-list 101 permit ip host 1.1.1.2 host 10.1.1.3
2(config)#access-list 101 permit ip any
2#debug ip pac 101
debug输出为:
*Jul 28 06:51:20.367: IP: s=1.1.1.2 (local), d=10.1.1.3 (Serial2/0), len 100, sending
*Jul 28 06:51:20.407: IP: s=10.1.1.3 (Serial2/0), d=1.1.1.2 (Serial2/0), len 100, rcvd 3
*Jul 28 06:51:20.407: ICMP: echo reply rcvd, src 10.1.1.3, dst 1.1.1.2
*Jul 28 06:51:20.435: IP: s=1.1.1.2 (local), d=10.1.1.3 (Serial2/0), len 100, sending
*Jul 28 06:51:20.475: IP: s=10.1.1.3 (Serial2/0), d=1.1.1.2 (Serial2/0), len 100, rcvd 3
*Jul 28 06:51:20.475: ICMP: echo reply rcvd, src 10.1.1.3, dst 1.1.1.2
*Jul 28 06:51:20.487: IP: s=1.1.1.2 (local), d=10.1.1.3 (Serial2/0), len 100, sending
*Jul 28 06:51:20.527: IP: s=10.1.1.3 (Serial2/0), d=1.1.1.2 (Serial2/0), len 100, rcvd 3
*Jul 28 06:51:20.527: ICMP: echo reply rcvd, src 10.1.1.3, dst 1.1.1.2
*Jul 28 06:51:20.547: IP: s=1.1.1.2 (local), d=10.1.1.3 (Serial2/0), len 100, sending
*Jul 28 06:51:20.595: IP: s=10.1.1.3 (Serial2/0), d=1.1.1.2 (Serial2/0), len 100, rcvd 3
*Jul 28 06:51:20.595: ICMP: echo reply rcvd, src 10.1.1.3, dst 1.1.1.2
*Jul 28 06:51:20.615: IP: s=1.1.1.2 (local), d=10.1.1.3 (Serial2/0), len 100, sending
*Jul 28 06:51:20.675: IP: s=10.1.1.3 (Serial2/0), d=1.1.1.2 (Serial2/0), len 100, rcvd 3
*Jul 28 06:51:20.675: ICMP: echo reply rcvd, src 10.1.1.3, dst 1.1.1.2
注意到是从s2/0出去的.
现在我们在r1上把s1/0shutdown掉
r2的路由表:
2#show ip route
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Serial1/0
S 10.0.0.0/8 [10/0] via 2.2.2.3
r2上的访问控制列表为:
2(config)#access-list 102 permit ip host 1.1.1.2 host 10.1.1.3
2(config)#access-list 102 permit ip any
2#debug ip pac 102
debug输出为:
*Jul 28 06:58:22.775: IP: s=2.2.2.2 (local), d=10.1.1.3 (Serial1/0), len 100, sending
*Jul 28 06:58:22.815: IP: s=10.1.1.3 (Serial1/0), d=2.2.2.2 (Serial1/0), len 100, rcvd 3
*Jul 28 06:58:22.815: ICMP: echo reply rcvd, src 10.1.1.3, dst 2.2.2.2
*Jul 28 06:58:22.847: IP: s=2.2.2.2 (local), d=10.1.1.3 (Serial1/0), len 100, sending
*Jul 28 06:58:22.887: IP: s=10.1.1.3 (Serial1/0), d=2.2.2.2 (Serial1/0), len 100, rcvd 3
*Jul 28 06:58:22.887: ICMP: echo reply rcvd, src 10.1.1.3, dst 2.2.2.2
*Jul 28 06:58:22.907: IP: s=2.2.2.2 (local), d=10.1.1.3 (Serial1/0), len 100, sending
*Jul 28 06:58:22.947: IP: s=10.1.1.3 (Serial1/0), d=2.2.2.2 (Serial1/0), len 100, rcvd 3
*Jul 28 06:58:22.947: ICMP: echo reply rcvd, src 10.1.1.3, dst 2.2.2.2
*Jul 28 06:58:22.955: IP: s=2.2.2.2 (local), d=10.1.1.3 (Serial1/0), len 100, sending
*Jul 28 06:58:23.007: IP: s=10.1.1.3 (Serial1/0), d=2.2.2.2 (Serial1/0), len 100, rcvd 3
*Jul 28 06:58:23.007: ICMP: echo reply rcvd, src 10.1.1.3, dst 2.2.2.2
*Jul 28 06:58:23.015: IP: s=2.2.2.2 (local), d=10.1.1.3 (Serial1/0), len 100, sending
*Jul 28 06:58:23.067: IP: s=10.1.1.3 (Serial1/0), d=2.2.2.2 (Serial1/0), len 100, rcvd 3
*Jul 28 06:58:23.067: ICMP: echo reply rcvd, src 10.1.1.3, dst 2.2.2.2
可以看出ping是从s1/0出去的,说明了浮动路由起了作用.
