配置基于静态路由的GRE隧道

介绍隧道两端采用静态路由方式将流量引导到GRE隧道的配置方法。

组网需求

如​​图​​​所示，FW_A和FW_B通过Internet相连，两者公网路由可达。网络1和网络2是两个私有的IP网络，通过在两台FW之间建立GRE隧道实现两个私有IP网络互联。

数据规划

配置思路

1. 在FW_A和FW_B上分别创建一个Tunnel接口。在Tunnel接口中指定隧道的源IP地址和目的IP等封装参数。
2. 配置静态路由，将出接口指定为本设备的Tunnel接口。该路由的作用是将需要经过GRE隧道传输的流量引入到GRE隧道中。
3. 配置安全策略，允许GRE隧道的建立和流量的转发。
4. 配置FW_A。

1.配置接口的IP地址，并将接口加入安全区域。

<sysname> system-view
[sysname] sysname FW_A
[FW_A] interface GigabitEthernet 1/0/1
[FW_A-GigabitEthernet1/0/1] ip address 1.1.1.1 24
[FW_A-GigabitEthernet1/0/1] quit
[FW_A] interface GigabitEthernet 1/0/0
[FW_A-GigabitEthernet1/0/0] ip address 10.1.1.1 24
[FW_A-GigabitEthernet1/0/0] quit
[FW_A] interface Tunnel 1
[FW_A-Tunnel1] ip address 172.16.2.1 24
[FW_A-Tunnel1] quit
[FW_A] firewall zone untrust
[FW_A-zone-untrust] add interface GigabitEthernet 1/0/1
[FW_A-zone-untrust] quit
[FW_A] firewall zone trust
[FW_A-zone-trust] add interface GigabitEthernet 1/0/0
[FW_A-zone-trust] quit
[FW_A] firewall zone dmz
[FW_A-zone-dmz] add interface tunnel 1
[FW_A-zone-dmz] quit

2.配置路由，将需要经过GRE隧道传输的流量引入到GRE隧道中。

[FW_A] ip route-static 10.1.2.0 24 Tunnel1

3.配置Tunnel接口的封装参数。

[FW_A] interface Tunnel 1
[FW_A-Tunnel1] tunnel-protocol gre
[FW_A-Tunnel1] source 1.1.1.1
[FW_A-Tunnel1] destination 5.5.5.5
[FW_A-Tunnel1] gre key cipher 123456
[FW_A-Tunnel1] quit

4.配置域间安全策略。配置Trust域和DMZ的域间安全策略，允许封装前的报文通过域间安全策略。

[FW_A] security-policy
[FW_A-policy-security] rule name policy1
[FW_A-policy-security-rule-policy1] source-zone trust dmz
[FW_A-policy-security-rule-policy1] destination-zone dmz trust
[FW_A-policy-security-rule-policy1] action permit
[FW_A-policy-security-rule-policy1] quit

配置Local和Untrust的域间安全策略，允许封装后的GRE报文通过域间安全策略。

[FW_A-policy-security] rule name policy2
[FW_A-policy-security-rule-policy2] source-zone local untrust
[FW_A-policy-security-rule-policy2] destination-zone untrust local
[FW_A-policy-security-rule-policy2] service gre
[FW_A-policy-security-rule-policy2] action permit
[FW_A-policy-security-rule-policy2] quit

5.配置FW_B。

1.配置接口的IP地址，并将接口加入安全区域。

<sysname> system-view
[sysname] sysname FW_B
[FW_B] interface GigabitEthernet 1/0/1
[FW_B-GigabitEthernet1/0/1] ip address 5.5.5.5 24
[FW_B-GigabitEthernet1/0/1] quit
[FW_B] interface GigabitEthernet 1/0/0
[FW_B-GigabitEthernet1/0/0] ip address 10.1.2.1 24
[FW_B-GigabitEthernet1/0/0] quit
[FW_B] interface Tunnel 1
[FW_B-Tunnel1] ip address 172.16.2.2 24
[FW_B-Tunnel1] quit
[FW_B] firewall zone untrust
[FW_B-zone-untrust] add interface GigabitEthernet 1/0/1
[FW_B-zone-untrust] quit
[FW_B] firewall zone trust
[FW_B-zone-trust] add interface GigabitEthernet 1/0/0
[FW_B-zone-trust] quit
[FW_B] firewall zone dmz
[FW_B-zone-dmz] add interface tunnel 1
[FW_B-zone-dmz] quit

2.配置路由，将需要经过GRE隧道传输的流量引入到GRE隧道中。

[FW_B] ip route-static 10.1.1.0 24 Tunnel1

3.配置Tunnel接口的封装参数。

[FW_B] interface Tunnel 1
[FW_B-Tunnel1] tunnel-protocol gre
[FW_B-Tunnel1] source 5.5.5.5
[FW_B-Tunnel1] destination 1.1.1.1
[FW_B-Tunnel1] gre key cipher 123456
[FW_B-Tunnel1] quit

4.配置域间安全策略。配置Trust域和DMZ的域间安全策略，允许封装前的报文通过域间安全策略。

[FW_B] security-policy
[FW_B-policy-security] rule name policy1
[FW_B-policy-security-rule-policy1] source-zone trust dmz
[FW_B-policy-security-rule-policy1] destination-zone dmz trust
[FW_B-policy-security-rule-policy1] action permit
[FW_B-policy-security-rule-policy1] quit

配置Local和Untrust的域间安全策略，允许封装后的GRE报文通过域间安全策略。

[FW_B-policy-security] rule name policy2
[FW_B-policy-security-rule-policy2] source-zone local untrust
[FW_B-policy-security-rule-policy2] destination-zone untrust local
[FW_B-policy-security-rule-policy2] service gre
[FW_B-policy-security-rule-policy2] action permit
[FW_B-policy-security-rule-policy2] quit

结果验证

1. 网络1中的PC与网络2中的PC能够相互ping通。
2. 在FW_A使用display ip routing-table命令查看路由表。可以看到目的地址为10.1.2.0/24，出接口为Tunnel1的路由。