1.配置基本IP地址

2.untrust区域连通性配置
[AR1-GigabitEthernet0/0/0]ip add 20.1.1.2 24
[AR1-GigabitEthernet0/0/1]ip add 20.1.2.2 24
[AR1]ospf 1
[AR1-ospf-1]area 0
[AR1-ospf-1-area-0.0.0.0]network 20.1.1.0 0.0.0.255
[AR1-ospf-1-area-0.0.0.0]network 20.1.2.0 0.0.0.255
3.LSW1的配置
（1）配置下行连接PC的接口
[LSW1]vlan batch 10 20
[LSW1-Ethernet0/0/1]port link-type access
[LSW1-Ethernet0/0/1]port default vlan 10
[LSW1-Ethernet0/0/2]port link-type access
[LSW1-Ethernet0/0/2]port default vlan 20
（2）配置上行连接FW1的接口
[LSW1-Ethernet0/0/3]port link-type trunk
[LSW1-Ethernet0/0/3]port trunk allow-pass vlan 10 20
4.配置FW1
（1）配置FW1通过子接口终结VLAN，实现跨网段的三层转发
[FW1]int g1/0/1.1
[FW1-GigabitEthernet1/0/1.1]vlan-type dot1q 10
[FW1-GigabitEthernet1/0/1.1]ip add 10.1.1.1 24
[FW1-GigabitEthernet1/0/1.1]int g1/0/1.2
[FW1-GigabitEthernet1/0/1.2]vlan-type dot1q 20
[FW1-GigabitEthernet1/0/1.2]ip add 10.1.2.1 24
（2）配置DHCP功能，为内网用户分配IP地址并指定DNS服务器地址
[FW1]dhcp enable
[FW1]int g1/0/1.1
[FW1-GigabitEthernet1/0/1.1]dhcp select interface
[FW1-GigabitEthernet1/0/1.1]dhcp server dns-list 114.114.114.114
（3）配置上行接口的IP地址和静态路由
[FW1-GigabitEthernet1/0/2]ip add 20.1.1.1 24
[FW1]ip route-static 0.0.0.0 0.0.0.0 20.1.1.2
（4）配置安全区域
[FW1]firewall zone trust
[FW1-zone-trust]add interface g1/0/1
[FW1-zone-trust]add interface g1/0/1.1
[FW1-zone-trust]add interface g1/0/1.2
[FW1]firewall zone untrust
[FW1-zone-untrust]add interface g1/0/2
（5）配置安全策略，允许域间互访
[FW1]security-policy
[FW1-policy-security]rule name policy1
[FW1-policy-security-rule-policy1]source-zone trust
[FW1-policy-security-rule-policy1]destination-zone untrust
[FW1-policy-security-rule-policy1]source-address 10.1.0.0 16
[FW1-policy-security-rule-policy1]action permit
（6）配置PAT地址池，开启允许端口地址转换
[FW1]nat address-group add_group1
[FW1-address-group-add_group1]mode pat
[FW1-address-group-add_group1]route enable
[FW1-address-group-add_group1]section 0 20.1.1.1 20.1.1.1
（7）配置源PAT策略，实现私网指定网段访问公网时自动进行源地址转换
[FW1]nat-policy
[FW1-policy-nat]rule name nat_policy1
[FW1-policy-nat-rule-nat_policy1]source-zone trust
[FW1-policy-nat-rule-nat_policy1]destination-zone untrust
[FW1-policy-nat-rule-nat_policy1]source-address 10.1.0.0 16
[FW1-policy-nat-rule-nat_policy1]action source-nat address-group add_group1
5.验证