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如下图是我课程设计核心层路由器,pc1-pc5仅为测试用,R1-R4为核心层路由器,R5作为防火墙(由于模拟器是Boson NetSim只能用路由器代替防火墙),拓扑图如下: 
 
其中R1、R2和R3配置命令大体相同,配置命令如下: 
interface Serial1/0 
          ip address 10.1.4.1 255.255.255.0 
 no ip directed-broadcast 
! 
interface Serial1/1 
 no ip address 
 no ip directed-broadcast 
 shutdown 
! 
interface Serial1/2 
 ip address 10.1.2.1 255.255.255.0 
 no ip directed-broadcast 
! 
interface Serial1/3 
 ip address 10.1.3.1 255.255.255.0 
 no ip directed-broadcast 
! 
interface FastEthernet0/0 
 ip address 192.168.1.1 255.255.255.0 
 no ip directed-broadcast 
 ip ospf cost 1 
! 
router ospf 1 
 network 10.1.2.0 0.0.0.255 area 0 
 network 10.1.3.0 0.0.0.255 area 0 
          network 10.1.4.0 0.0.0.255 area 0 
 network 192.168.1.0 0.0.0.255 area 0 
R1路由表: 
Gateway of last resort is not set 
     10.0.0.0/24 is subnetted, 7 subnets 
C       10.1.4.0 is directly connected, Serial1/0 
C       10.1.2.0 is directly connected, Serial1/2 
C       10.1.3.0 is directly connected, Serial1/3 
O       10.2.3.0 [110/64] via 10.2.3.1, 00:35:00, Serial1/2 
O       10.2.4.0 [110/64] via 10.2.4.1, 00:35:00, Serial1/2 
O       10.4.5.0 [110/64] via 10.1.4.2, 00:35:00, Serial1/0 
O       10.3.4.0 [110/64] via 10.3.4.2, 00:35:00, Serial1/0 
C    192.168.1.0 is directly connected, FastEthernet0/0 
O    192.168.2.0 [110/64] via 192.168.2.1, 00:35:00, Serial1/2 
O    192.168.4.0 [110/64] via 192.168.4.1, 00:35:00, Serial1/0 
O    192.168.3.0 [110/64] via 192.168.3.1, 00:35:00, Serial1/3 
R1邻居表: 
R1#sho cdp n 
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge 
S -Switch, H - Host, i - IGMP, r - Repeater 
Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID 
R2                  Ser1/2         174          R         4500      Ser 1/1 
R3                  Ser1/3         174          R         4500      Ser 1/1 
R4                  Ser1/0         174          R         4500      Ser 1/1 
R2路由表: 
Gateway of last resort is not set 
     10.0.0.0/24 is subnetted, 7 subnets 
C       10.2.4.0 is directly connected, Serial1/0 
C       10.1.2.0 is directly connected, Serial1/1 
C       10.2.3.0 is directly connected, Serial1/3 
O       10.4.5.0 [110/192] via 10.1.2.1, 00:36:55, Serial1/1 
O       10.1.4.0 [110/192] via 10.1.2.1, 00:36:55, Serial1/1 
O       10.3.4.0 [110/64] via 10.3.4.2, 00:36:55, Serial1/0 
O       10.1.3.0 [110/64] via 10.2.3.2, 00:36:55, Serial1/3 
C    192.168.2.0 is directly connected, FastEthernet0/0 
O    192.168.4.0 [110/64] via 192.168.4.1, 00:36:55, Serial1/0 
O    192.168.3.0 [110/64] via 192.168.3.1, 00:36:55, Serial1/3 
O    192.168.1.0 [110/64] via 192.168.1.1, 00:36:35, Serial1/1 
R2邻居表: 
R2#sho cdp n 
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge 
S -Switch, H - Host, i - IGMP, r - Repeater 
Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID 
R1                  Ser1/1         161          R         4500      Ser 1/2 
R3                  Ser1/3         161          R         4500      Ser 1/2 
R4                  Ser1/0         161          R         4500      Ser 1/2 
R3路由表: 
Gateway of last resort is not set 
     10.0.0.0/24 is subnetted, 7 subnets 
C       10.3.4.0 is directly connected, Serial1/0 
C       10.1.3.0 is directly connected, Serial1/1 
C       10.2.3.0 is directly connected, Serial1/2 
O       10.4.5.0 [110/192] via 10.1.3.1, 00:37:45, Serial1/1 
O       10.1.4.0 [110/192] via 10.1.3.1, 00:37:45, Serial1/1 
O       10.2.4.0 [110/320] via 10.1.3.1, 00:37:45, Serial1/1 
O       10.1.2.0 [110/64] via 10.1.3.1, 00:37:35, Serial1/1 
C    192.168.3.0 is directly connected, FastEthernet0/0 
O    192.168.4.0 [110/64] via 192.168.4.1, 00:37:45, Serial1/0 
O    192.168.1.0 [110/64] via 192.168.1.1, 00:37:35, Serial1/1 
O    192.168.2.0 [110/64] via 192.168.2.1, 00:37:35, Serial1/2 
R3邻居表: 
R3#sho cdp n 
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge 
S -Switch, H - Host, i - IGMP, r - Repeater 
Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID 
R1                  Ser1/1         171          R         4500      Ser 1/3 
R2                  Ser1/2         171          R         4500      Ser 1/3 
R4                  Ser1/0         171          R         4500      Ser 1/3 
R4配置命令: 
interface Serial1/0 
          ip address 10.4.5.1 255.255.255.0 
 no ip directed-broadcast 
! 
interface Serial1/1 
 ip address 10.1.4.2 255.255.255.0 
 no ip directed-broadcast 
! 
interface Serial1/2 
 ip address 10.2.4.2 255.255.255.0 
 no ip directed-broadcast 
! 
interface Serial1/3 
 ip address 10.3.4.2 255.255.255.0 
 no ip directed-broadcast 
! 
interface FastEthernet0/0 
 ip address 192.168.4.1 255.255.255.0 
 no ip directed-broadcast 
 ip ospf cost 1 
! 
router ospf 1 
 network 10.1.4.0 0.0.0.255 area 0 
 network 10.2.4.0 0.0.0.255 area 0 
 network 10.3.4.0 0.0.0.255 area 0 
          network 10.4.5.0 0.0.0.255 area 0 
 network 192.168.4.0 0.0.0.255 area 0 
R4路由表: 
Gateway of last resort is not set 
     10.0.0.0/24 is subnetted, 7 subnets 
C       10.4.5.0 is directly connected, Serial1/0 
C       10.1.4.0 is directly connected, Serial1/1 
C       10.2.4.0 is directly connected, Serial1/2 
C       10.3.4.0 is directly connected, Serial1/3 
O       10.1.2.0 [110/64] via 10.1.2.1, 00:38:28, Serial1/1 
O       10.1.3.0 [110/64] via 10.1.3.1, 00:38:28, Serial1/1 
O       10.2.3.0 [110/64] via 10.2.3.1, 00:38:28, Serial1/2 
C    192.168.4.0 is directly connected, FastEthernet0/0 
O    192.168.5.0 [110/64] via 192.168.5.1, 00:39:38, Serial1/0 
O    192.168.1.0 [110/64] via 192.168.1.1, 00:38:28, Serial1/1 
O    192.168.2.0 [110/64] via 192.168.2.1, 00:38:28, Serial1/2 
O    192.168.3.0 [110/64] via 192.168.3.1, 00:31:07, Serial1/3 
R4邻居: 
R4#sho cdp n 
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge 
S -Switch, H - Host, i - IGMP, r - Repeater 
Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID 
R1                  Ser1/1         169          R         4500      Ser 1/0 
R5                  Ser1/0         169          R         4500      Ser 1/0 
R2                  Ser1/2         169          R         4500      Ser 1/0 
R3                  Ser1/3         169          R         4500      Ser 1/0 
 
 
R5我想作为防火墙 该如何设置呢?采用什么协议 ?我现在是如下配置的 
R5配置命令: 
interface Serial1/0 
          ip address 10.4.5.2 255.255.255.0 
 no ip directed-broadcast 
! 
interface Serial1/1 
 no ip address 
 no ip directed-broadcast 
 shutdown 
! 
interface Serial1/2 
 no ip address 
 no ip directed-broadcast 
 shutdown 
! 
interface Serial1/3 
 no ip address 
 no ip directed-broadcast 
 shutdown 
! 
interface FastEthernet0/0 
 ip address 192.168.5.1 255.255.255.0 
 no ip directed-broadcast 
 ip ospf cost 1 
! 
router ospf 1 
          network 10.4.5.0 0.0.0.255 area 0 
 network 192.168.5.0 0.0.0.255 area 0 
! 
R5路由表: 
Gateway of last resort is not set 
     10.0.0.0/24 is subnetted, 4 subnets 
C       10.4.5.0 is directly connected, Serial1/0 
O       10.1.4.0 [110/64] via 10.1.4.2, 00:41:18, Serial1/0 
O       10.2.4.0 [110/64] via 10.2.4.2, 00:41:18, Serial1/0 
O       10.3.4.0 [110/192] via 10.4.5.1, 00:41:18, Serial1/0 
C    192.168.5.0 is directly connected, FastEthernet0/0 
O    192.168.4.0 [110/64] via 192.168.4.1, 00:41:18, Serial1/0 
R5邻居表: 
R5#sho cdp nei 
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge 
S -Switch, H - Host, i - IGMP, r - Repeater 
Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID 
R4                  Ser1/0         169          R         4500      Ser 1/0 
 
我这么配置发现问题是,192.168.0.0 网段所有pc都不能访问 pc5  192.168.5.2    ,我应该怎么配置防火墙(R5)? 
作为核心层这样配置路由器可以么?麻烦各位啦! 
 
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