IPSec&GRE

手工方式建立IPSec隧道组网

实验拓扑

配置步骤

第一步配置IP地址

RouterA

sysname RouterA
#
interface GigabitEthernet0/0/0
 ip address 12.1.1.1 255.255.255.0 
 ipsec policy map1
#
interface GigabitEthernet0/0/1            
 ip address 10.1.1.1 255.255.255.0 
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Internet

sysname Internet
#
interface GigabitEthernet0/0/0
 ip address 12.1.1.2 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 23.1.1.2 255.255.255.0 
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RouterB

sysname RouterB
#
interface GigabitEthernet0/0/0
 ip address 23.1.1.3 255.255.255.0 
#
interface GigabitEthernet0/0/1            
 ip address 10.1.2.1 255.255.255.0 
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第二步配置静态路由

RouterA

ip route-static 10.1.2.0 255.255.255.0 12.1.1.2   //配置一条目的地址是总部内网的静态路由
ip route-static 23.1.1.0 255.255.255.0 12.1.1.2  //配置一条目的地址是总部外网出口的静态路由
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RouterB

ip route-static 10.1.1.0 255.255.255.0 23.1.1.2  //配置一条目的地址是分支内网的静态路由
ip route-static 12.1.1.0 255.255.255.0 23.1.1.2 //配置一条目的地址是分支外网出口的静态路由
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第三步配置IPSec

RouterA

acl number 3101   //配置ACL 3101，匹配从分支子网到总部子网的流量
 rule 5 permit ip source 10.1.1.0 0.0.0.255 destination 10.1.2.0 0.0.0.255 
#
ipsec proposal tran1  //配置IPSec安全提议
 esp authentication-algorithm sha2-256 
 esp encryption-algorithm aes-128
#
ipsec policy map1 10 manual   //配置手动方式安全策略
 security acl 3101
 proposal tran1                           
 tunnel local 12.1.1.1
 tunnel remote 23.1.1.3
 sa spi inbound esp 54321
 sa string-key inbound esp cipher wml
 sa spi outbound esp 12345
 sa string-key outbound esp cipher wml
#
interface GigabitEthernet0/0/0
 ipsec policy map1
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RouterB

acl number 3101   //配置ACL 3101，匹配从总部子网到分支子网的流量
 rule 5 permit ip source 10.1.2.0 0.0.0.255 destination 10.1.1.0 0.0.0.255 
#
ipsec proposal tran1  //配置IPSec安全提议
 esp authentication-algorithm sha2-256 
 esp encryption-algorithm aes-128
#
ipsec policy use1 10 manual  //配置手动方式安全策略
 security acl 3101
 proposal tran1                           
 tunnel local 23.1.1.3
 tunnel remote 12.1.1.1
 sa spi inbound esp 12345
 sa string-key inbound esp cipher wml
 sa spi outbound esp 54321
 sa string-key outbound esp cipher wml
#
interface GigabitEthernet0/0/0
 ipsec policy use1
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• 在Router上执行命令display ike sa，可以看到SA建立成功。

抓包测试

GRE Over IPSec功能的配置组网

实验拓扑

配置命令

RouterA

sysname RouterA
//在RouterA上配置IPSec安全提议。
ipsec proposal tran1
 esp authentication-algorithm sha2-256 
 esp encryption-algorith#m aes-128
//在RouterA上配置IKE安全提议
ike proposal 5
 encryption-algorithm aes-cbc-128
 dh group14
//在RouterA上配置IKE对等体。
ike peer spub v1
 pre-shared-key cipher wml
 ike-proposal 5
//在RouterA上配置安全框架。
ipsec profile profile1
 ike-peer spub
 proposal tran1
#
interface GigabitEthernet0/0/0
 ip address 14.1.1.1 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 10.1.1.1 255.255.255.0 
#                                         
interface Tunnel0/0/0
 ip address 192.168.1.1 255.255.255.0 
 tunnel-protocol gre
 source 14.1.1.1
 destination 24.1.1.2
 ipsec profile profile1 //在RouterA的接口上引用安全框架。
#
ip route-static 10.1.2.0 255.255.255.0 Tunnel0/0/0
ip route-static 24.1.1.0 255.255.255.0 14.1.1.4
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RouterB

sysname RouterB
#
ipsec proposal tran1
 esp authentication-algorithm sha2-256 
 esp encryption-algorithm aes-128
#
ike proposal 5
 encryption-algorithm aes-cbc-128
 dh group14
#
ike peer spua v1
 pre-shared-key cipher wml
 ike-proposal 5
#
ipsec profile profile1
 ike-peer spua
 proposal tran1
#
interface GigabitEthernet0/0/0
 ip address 10.1.2.1 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 24.1.1.2 255.255.255.0 
#
interface Tunnel0/0/0
 ip address 192.168.1.2 255.255.255.0 
 tunnel-protocol gre
 source 24.1.1.2
 destination 14.1.1.1
 ipsec profile profile1
#
ip route-static 10.1.1.0 255.255.255.0 Tunnel0/0/0
ip route-static 14.1.1.0 255.255.255.0 24.1.1.4
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R4

//只需要正常配置两个接口得IP地址即可
interface GigabitEthernet0/0/0
 ip address 14.1.1.4 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 24.1.1.4 255.255.255.0
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配置GRE使用静态路由组网图

实验拓扑

配置步骤

1.配置RouterA

sysname RouterA
#
interface GigabitEthernet1/0/0  //配置公网出接口
 ip address 20.1.1.1 255.255.255.0
#
interface GigabitEthernet2/0/0  //配置私网出接口
 ip address 10.1.1.2 255.255.255.0
#
interface Tunnel0/0/1  //配置Tunnel接口，Tunnel的源地址是发出报文的实际接口IP地址，目的地址是接收报文的实际接口IP地址
 ip address 10.3.1.1 255.255.255.0
 tunnel-protocol gre
 source 20.1.1.1
 destination 30.1.1.2
#
ospf 1  //配置公网路由
 area 0.0.0.0
  network 20.1.1.0 0.0.0.255
#
ip route-static 10.2.1.0 255.255.255.0 Tunnel0/0/1  //配置私网静态路由，下一条接口为Tunnel接口
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2.配置RouterB

sysname RouterB
#
interface GigabitEthernet1/0/0
ip address 20.1.1.2 255.255.255.0
#
interface GigabitEthernet2/0/0
ip address 30.1.1.1 255.255.255.0
#
ospf 1  //配置公网路由
 area 0.0.0.0
  network 20.1.1.0 0.0.0.255
  network 30.1.1.0 0.0.0.255
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3.配置RouterC

sysname RouterC
#
interface GigabitEthernet1/0/0  //配置公网出接口
ip address 30.1.1.2 255.255.255.0
#
interface GigabitEthernet2/0/0  //配置私网出接口
 ip address 10.2.1.2 255.255.255.0
#
interface Tunnel0/0/1  //配置Tunnel接口，Tunnel的源地址是发出报文的实际接口IP地址，目的地址是接收报文的实际接口IP地址
 ip address 10.3.1.2 255.255.255.0
 tunnel-protocol gre
 source 30.1.1.2
 destination 20.1.1.1
#
ospf 1  //配置公网路由
 area 0.0.0.0
  network 30.1.1.0 0.0.0.255
#
ip route-static 10.1.1.0 255.255.255.0 Tunnel0/0/1  //配置私网静态路由，下一条接口为Tunnel接口
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4.验证配置结果

• 在RouterA和RouterC上执行display ip routing-table命令，可以看到去往对端目的地址的出接口为Tunnel接口。
• PC1和PC2能互相Ping通。