本举例中的防火墙配置以USG6650 V500R001C60为例，其他防火墙的配置方法请参见对应的文档指南。
采用如下思路进行配置：
配置交换机作为用户的网关，通过VLANIF接口，实现跨网段用户互访。
配置交换机作为DHCP服务器，为用户分配IP地址。
开启防火墙域间安全策略，使不同域的报文可以相互转发。
配置防火墙PAT转换功能，使用户可以访问外部网络。
# 配置连接用户的接口和对应的VLANIF接口。
<HUAWEI> system-view
[HUAWEI] sysname Switch
[Switch] vlan batch 2 3
[Switch] interface gigabitethernet 0/0/2
[Switch-GigabitEthernet0/0/2] port link-type access//配置接口接入类型为access
[Switch-GigabitEthernet0/0/2] port default vlan 2//配置接口加入VLAN 2
[Switch-GigabitEthernet0/0/2] quit
[Switch] interface gigabitethernet 0/0/3
[Switch-GigabitEthernet0/0/3] port link-type access
[Switch-GigabitEthernet0/0/3] port default vlan 3
[Switch-GigabitEthernet0/0/3] quit
[Switch] interface vlanif 2
[Switch-Vlanif2] ip address 192.168.1.1 24
[Switch-Vlanif2] quit
[Switch] interface vlanif 3
[Switch-Vlanif3] ip address 192.168.2.1 24
[Switch-Vlanif3] quit
# 配置连接防火墙的接口和对应的VLANIF接口。
[Switch] vlan batch 100 [Switch] interface gigabitethernet 0/0/1 [Switch-GigabitEthernet0/0/1] port link-type access [Switch-GigabitEthernet0/0/1] port default vlan 100 [Switch-GigabitEthernet0/0/1] quit [Switch] interface vlanif 100 [Switch-Vlanif100] ip address 192.168.100.2 24 [Switch-Vlanif100] quit
# 配置缺省路由。
[Switch] ip route-static 0.0.0.0 0.0.0.0 192.168.100.1//缺省路由的下一跳是防火墙接口的IP地址192.168.100.1
# 配置DHCP服务器。
[Switch] dhcp enable [Switch] interface vlanif 2 [Switch-Vlanif2] dhcp select interface//DHCP使用接口地址池的方式为用户分配IP地址 [Switch-Vlanif2] dhcp server dns-list 114.114.114.114 223.5.5.5//配置的DNS-List 114.114.114.114是公用的DNS服务器地址，是不区分运营商的。在实际应用中，请根据运营商分配的DNS进行配置 [Switch-Vlanif2] quit [Switch] interface vlanif 3 [Switch-Vlanif3] dhcp select interface [Switch-Vlanif3] dhcp server dns-list 114.114.114.114 223.5.5.5 [Switch-Vlanif3] quit
# 配置连接交换机的接口对应的IP地址。
<USG6600> system-view [USG6600] interface gigabitethernet 1/0/1 [USG6600-GigabitEthernet1/0/1] ip address 192.168.100.1 255.255.255.0 [USG6600-GigabitEthernet1/0/1] quit
# 配置连接公网的接口对应的IP地址。
[USG6600] interface gigabitethernet 1/0/2
[USG6600-GigabitEthernet1/0/2] ip address 1.1.1.2 255.255.255.0//配置连接公网接口的IP地址和公网的IP地址在同一网段
[USG6600-GigabitEthernet1/0/2] quit
# 配置缺省路由和回程路由。
[USG6600] ip route-static 0.0.0.0 0.0.0.0 1.1.1.1//配置静态缺省路由的下一跳指向公网提供的IP地址1.1.1.1 [USG6600] ip route-static 192.168.0.0 255.255.0.0 192.168.100.2//配置回程路由的下一跳就指向交换机上行接口的IP地址192.168.100.2
# 配置安全策略。
[USG6600] firewall zone trust//配置trust域 [USG6600-zone-trust] add interface gigabitethernet 1/0/1 [USG6600-zone-trust] quit [USG6600] firewall zone untrust//配置untrust域 [USG6600-zone-untrust] add interface gigabitethernet 1/0/2 [USG6600-zone-untrust] quit
[USG6600] security-policy [USG6600-policy-security] rule name policy1 [USG6600-policy-security-rule-policy1] source-zone trust [USG6600-policy-security-rule-policy1] destination-zone untrust [USG6600-policy-security-rule-policy1] source-address 192.168.0.0 mask 255.255.0.0 [USG6600-policy-security-rule-policy1] action permit [USG6600-policy-security-rule-policy1] quit [USG6600-policy-security] quit
[USG6600] nat address-group addressgroup1
[USG6600-address-group-addressgroup1] mode pat
[USG6600-address-group-addressgroup1] route enable
[USG6600-address-group-addressgroup1] section 0 1.1.1.2 1.1.1.2 //转换的公网IP地址
[USG6600-address-group-addressgroup1] quit
[USG6600] nat-policy
[USG6600-policy-nat] rule name policy_nat1
[USG6600-policy-nat-rule-policy_nat1] source-zone trust
[USG6600-policy-nat-rule-policy_nat1] destination-zone untrust
[USG6600-policy-nat-rule-policy_nat1] source-address 192.168.0.0 mask 255.255.0.0//允许进行PAT转换的源IP地址
[USG6600-policy-nat-rule-policy_nat1] action nat address-group addressgroup1
[USG6600-policy-nat-rule-policy_nat1] quit
[USG6600-policy-nat] quit
[USG6600] quit
配置PC1的IP地址为192.168.1.2/24，网关为192.168.1.1；PC2的IP地址为192.168.2.2/24，网关为192.168.2.1。
配置外网PC的IP地址为1.1.1.1/24，网关为1.1.1.2。
配置完成后，PC1和PC2都可以Ping通外网的IP 1.1.1.1/24，PC1和PC2都可以访问Internet。
原文：https://www.cnblogs.com/kofsony/p/12172576.html