ensp防火墙NAT配置、通过VRRP实现双机热备

实验拓扑

防火墙NAT配置 

域间双转

当外网需要访问内网服务器时,可应用域间双向NAT

也就是 client2 访问 server1

安全策略:

 NAT策略:

 测试:

 抓包:

域内双转

当同一安全域内不同网段间互相访问,可通过防火墙进行访问,也就是域内的NAT

NAT策略:

### 详细配置步骤:ENSP双机热备实验 #### 安全区域划分 在防火墙设备FW1和FW2上,需要定义安全区域。通常将内部网络划分为Trust区域,外部网络划分为Untrust区域。以下是具体配置命令: ```bash # 在FW1上 [FW1] firewall zone trust [FW1-zone-trust] add interface GigabitEthernet 0/0/1 # 将内网接口加入Trust区域 [FW1-zone-trust] quit [FW1] firewall zone untrust [FW1-zone-untrust] add interface GigabitEthernet 0/0/2 # 将外网接口加入Untrust区域 [FW1-zone-untrust] quit # 在FW2上 [FW2] firewall zone trust [FW2-zone-trust] add interface GigabitEthernet 0/0/1 [FW2-zone-trust] quit [FW2] firewall zone untrust [FW2-zone-untrust] add interface GigabitEthernet 0/0/2 [FW2-zone-untrust] quit ``` #### IP基础配置 为FW1和FW2的各个接口分配IP地址,并确保与实验拓扑一致。 ```bash # FW1配置 [FW1] interface GigabitEthernet 0/0/1 [FW1-GigabitEthernet0/0/1] ip address 192.168.1.1 255.255.255.0 # 内网接口 [FW1-GigabitEthernet0/0/1] quit [FW1] interface GigabitEthernet 0/0/2 [FW1-GigabitEthernet0/0/2] ip address 202.100.1.1 255.255.255.0 # 外网接口 [FW1-GigabitEthernet0/0/2] quit # FW2配置 [FW2] interface GigabitEthernet 0/0/1 [FW2-GigabitEthernet0/0/1] ip address 192.168.1.2 255.255.255.0 [FW2-GigabitEthernet0/0/1] quit [FW2] interface GigabitEthernet 0/0/2 [FW2-GigabitEthernet0/0/2] ip address 202.100.1.2 255.255.255.0 [FW2-GigabitEthernet0/0/2] quit ``` #### VRRP备份组设置 通过VRRP协议实现网关冗余。以下是在FW1和FW2上创建VRRP备份组的配置示例: ```bash # FW1配置 [FW1] interface GigabitEthernet 0/0/1 [FW1-GigabitEthernet0/0/1] vrrp vrid 1 virtual-ip 192.168.1.254 # 设置虚拟IP [FW1-GigabitEthernet0/0/1] vrrp vrid 1 priority 120 # 提高优先级 [FW1-GigabitEthernet0/0/1] quit # FW2配置 [FW2] interface GigabitEthernet 0/0/1 [FW2-GigabitEthernet0/0/1] vrrp vrid 1 virtual-ip 192.168.1.254 [FW2-GigabitEthernet0/0/1] vrrp vrid 1 priority 100 # 默认优先级 [FW2-GigabitEthernet0/0/1] quit ``` #### 心跳机制 为了确保主备切换的可靠性,需配置心跳线接口。假设FW1和FW2之间通过GigabitEthernet 0/0/3连接。 ```bash # FW1配置 [FW1] interface GigabitEthernet 0/0/3 [FW1-GigabitEthernet0/0/3] ip address 10.1.1.1 255.255.255.0 [FW1-GigabitEthernet0/0/3] hrp enable # 启用心跳功能 [FW1-GigabitEthernet0/0/3] quit # FW2配置 [FW2] interface GigabitEthernet 0/0/3 [FW2-GigabitEthernet0/0/3] ip address 10.1.1.2 255.255.255.0 [FW2-GigabitEthernet0/0/3] hrp enable [FW2-GigabitEthernet0/0/3] quit ``` #### 安全策略配置 允许PC之间的通信,需在FW1和FW2上配置安全策略。 ```bash # FW1配置 [FW1] security-policy [FW1-policy-security] rule name allow_pc_communication [FW1-policy-security-rule-allow_pc_communication] source-zone trust [FW1-policy-security-rule-allow_pc_communication] destination-zone trust [FW1-policy-security-rule-allow_pc_communication] action permit [FW1-policy-security-rule-allow_pc_communication] quit # FW2配置 [FW2] security-policy [FW2-policy-security] rule name allow_pc_communication [FW2-policy-security-rule-allow_pc_communication] source-zone trust [FW2-policy-security-rule-allow_pc_communication] destination-zone trust [FW2-policy-security-rule-allow_pc_communication] action permit [FW2-policy-security-rule-allow_pc_communication] quit ``` #### 允许PC通信 确保PC能够通过虚拟网关访问外部网络,需配置NAT规则。 ```bash # FW1配置 [FW1] nat address-group 1 [FW1-nat-address-group1] mode pat [FW1-nat-address-group1] section 0 202.100.1.1 202.100.1.1 [FW1-nat-address-group1] quit [FW1] security-policy [FW1-policy-security] rule name allow_nat [FW1-policy-security-rule-allow_nat] source-zone trust [FW1-policy-security-rule-allow_nat] destination-zone untrust [FW1-policy-security-rule-allow_nat] action nat [FW1-policy-security-rule-allow_nat] quit # FW2配置 [FW2] nat address-group 1 [FW2-nat-address-group1] mode pat [FW2-nat-address-group1] section 0 202.100.1.1 202.100.1.1 [FW2-nat-address-group1] quit [FW2] security-policy [FW2-policy-security] rule name allow_nat [FW2-policy-security-rule-allow_nat] source-zone trust [FW2-policy-security-rule-allow_nat] destination-zone untrust [FW2-policy-security-rule-allow_nat] action nat [FW2-policy-security-rule-allow_nat] quit ``` ### 注意事项 上述配置中,VRRP备份组的优先级决定了主备角色[^1]。同时,HRP协议用于心跳检测和状态同步[^2]。
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