组网需求
如图,某公司拥有多个部门且位于不同网段,各部门均有访问Internet的需求。现要求用户通过三层交换机和防火墙访问外部网络,且要求三层交换机作为用户的网关。
三层交换机与防火墙对接上网组网图
配置思路
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。
操作步骤
配置交换机
# 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
配置防火墙
# 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 200.0.0.2 255.255.255.0 //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 0.0.0.0 200.0.0.1 //配置静态缺省路由的下一跳指向公网提供的IP地址200.0.0.1[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
# 配置安全策略,允许域间互访。
[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
# 配置PAT地址池,开启允许端口地址转换。
[USG6600] nat address-group addressgroup1 [USG6600-address-group-addressgroup1] mode pat[USG6600-address-group-addressgroup1] route enable[USG6600-address-group-addressgroup1] section 0 200.0.0.2 200.0.0.2 //转换的公网IP地址[USG6600-address-group-addressgroup1] quit
# 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。
[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
检查配置结果
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200.0.0.1/24,网关为200.0.0.2。
配置完成后,PC1和PC2都可以Ping通外网的IP 200.0.0.1/24,PC1和PC2都可以访问Internet。
配置文件
Switch的配置文件
# sysname Switch # vlan batch 2 to 3 100 # dhcp enable # interface Vlanif2 ip address 192.168.1.1 255.255.255.0 dhcp select interface dhcp server dns-list 114.114.114.114 223.5.5.5 # interface Vlanif3 ip address 192.168.2.1 255.255.255.0 dhcp select interface dhcp server dns-list 114.114.114.114 223.5.5.5 # interface Vlanif100 ip address 192.168.100.2 255.255.255.0 # interface GigabitEthernet0/0/1 port link-type access port default vlan 100 # interface GigabitEthernet0/0/2 port link-type access port default vlan 2 # interface GigabitEthernet0/0/3 port link-type access port default vlan 3 # ip route-static 0.0.0.0 0.0.0.0 192.168.100.1 # return
USG的配置文件
# interface GigabitEthernet1/0/1 ip address 192.168.100.1 255.255.255.0 # interface GigabitEthernet0/0/2 ip address 200.0.0.2 255.255.255.0 # firewall zone trust set priority 85 add interface GigabitEthernet1/0/1 # firewall zone untrust set priority 5 add interface GigabitEthernet0/0/2 # ip route-static 0.0.0.0 0.0.0.0 200.0.0.1 ip route-static 192.168.0.0 255.255.0.0 192.168.100.2 # nat address-group addressgroup1 0 mode pat route enable section 0 200.0.0.2 200.0.0.2 # security-policy rule name policy1 source-zone trust destination-zone untrust source-address 192.168.0.0 mask 255.255.0.0 action permit # nat-policy rule name policy_nat1 source-zone trust destination-zone untrust source-address 192.168.0.0 mask 255.255.0.0 action nat address-group addressgroup1 # return