二层交换机与防火墙对接上网配置示例
组网图形
图1 二层交换机与防火墙对接上网组网图
- 二层交换机简介
- 配置注意事项
- 组网需求
- 配置思路
- 操作步骤
- 配置文件
- 相关信息
二层交换机简介
二层交换机指的是仅能够进行二层转发，不能进行三层转发的交换机。也就是说仅支持二层特性，不支持路由等三层特性的交换机。
二层交换机一般部署在接入层，不能作为用户的网关。
配置注意事项
本举例中的交换机配置适用于S系列交换机所有产品的所有版本。
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。
组网需求
如图1所示，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。现要求用户通过二层交换机和防火墙访问外部网络，且要求防火墙作为用户的网关。
配置思路
采用如下思路进行配置：
- 配置交换机基于接口划分VLAN，实现二层转发。
- 配置防火墙作为用户的网关，通过子接口或VLANIF接口实现跨网段的三层转发。
- 配置防火墙作为DHCP服务器，为用户PC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功能，使内网用户可以访问外部网络。
操作步骤
- 配置交换机
# 配置下行连接用户的接口。
<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# 配置上行连接防火墙的接口。
[Switch] interface gigabitethernet 0/0/1
[Switch-GigabitEthernet0/0/1] port link-type trunk
[Switch-GigabitEthernet0/0/1] port trunk allow-pass vlan 2 3 //配置接口以trunk方式透传VLAN 2和VLAN 3
[Switch-GigabitEthernet0/0/1] quit- 配置防火墙
防火墙的配置有两种方式，配置子接口或者配置VLANIF接口，两种方式选择其一即可。
- 配置防火墙通过子接口终结VLAN，实现跨网段的三层转发。
# 配置终结子接口。
<USG6600> system-view
[USG6600] interface gigabitethernet 1/0/1.1
[USG6600-GigabitEthernet1/0/1.1] vlan-type dot1q 2
[USG6600-GigabitEthernet1/0/1.1] ip address 192.168.1.1 24
[USG6600-GigabitEthernet1/0/1.1] quit
[USG6600] interface gigabitethernet 1/0/1.2
[USG6600-GigabitEthernet1/0/1.2] vlan-type dot1q 3
[USG6600-GigabitEthernet1/0/1.2] ip address 192.168.2.1 24
[USG6600-GigabitEthernet1/0/1.2] quit# 配置DHCP功能，为内网用户分配IP地址并指定DNS服务器地址。
[USG6600] dhcp enable
[USG6600] interface gigabitethernet 1/0/1.1
[USG6600-GigabitEthernet1/0/1.1] dhcp select interface //开启接口采用接口地址池的DHCP Server功能
[USG6600-GigabitEthernet1/0/1.1] 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
[USG6600-GigabitEthernet1/0/1.1] quit
[USG6600] interface gigabitethernet 1/0/1.2
[USG6600-GigabitEthernet1/0/1.2] dhcp select interface
[USG6600-GigabitEthernet1/0/1.2] dhcp server dns-list 114.114.114.114 223.5.5.5
[USG6600-GigabitEthernet1/0/1.2] quit# 配置公网接口的IP地址和静态路由。
[USG6600] interface gigabitethernet 1/0/2
[USG6600-GigabitEthernet1/0/2] ip address 203.0.113.2 255.255.255.0 //配置连接公网的接口GE0/0/2的IP地址203.0.113.2
[USG6600-GigabitEthernet1/0/2] quit
[USG6600] ip route-static 0.0.0.0 0.0.0.0 203.0.113.1 //配置静态缺省路由的下一跳指向公网提供的IP地址203.0.113.1# 配置安全区域。
[USG6600] firewall zone trust //配置trust域
[USG6600-zone-trust] add interface gigabitethernet 1/0/1
[USG6600-zone-trust] add interface gigabitethernet 1/0/1.1
[USG6600-zone-trust] add interface gigabitethernet 1/0/1.2
[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 0 203.0.113.2 203.0.113.2 //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- 配置防火墙通过配置VLANIF接口，实现跨网段的三层转发。
# 配置VLANIF接口。
<USG6600> system-view
[USG6600] vlan batch 2 3
[USG6600] interface gigabitethernet 1/0/1
[USG6600-GigabitEthernet1/0/1] portswitch //将以太网接口从三层模式切换到二层模式。如果接口已经是二层模式，跳过该步骤
[USG6600-GigabitEthernet1/0/1] port link-type hybrid
[USG6600-GigabitEthernet1/0/1] port hybrid tagged vlan 2 to 3
[USG6600-GigabitEthernet1/0/1] quit
[USG6600] interface vlanif 2
[USG6600-Vlanif2] ip address 192.168.1.1 24 //配置VLANIF2的IP地址作为PC1的网关
[USG6600-Vlanif2] quit
[USG6600] interface vlanif 3
[USG6600-Vlanif3] ip address 192.168.2.1 24 //配置VLANIF3的IP地址作为PC2的网关
[USG6600-Vlanif3] quit# 配置DHCP功能。
[USG6600] dhcp enable
[USG6600] interface vlanif 2
[USG6600-Vlanif2] dhcp select interface
[USG6600-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
[USG6600-Vlanif2] quit
[USG6600] interface vlanif 3
[USG6600-Vlanif3] dhcp select interface
[USG6600-Vlanif3] dhcp server dns-list 114.114.114.114 223.5.5.5
[USG6600-Vlanif3] quit# 配置公网接口的IP地址和静态路由。
[USG6600] interface gigabitethernet 1/0/2
[USG6600-GigabitEthernet1/0/2] ip address 203.0.113.2 255.255.255.0
[USG6600-GigabitEthernet1/0/2] quit
[USG6600] ip route-static 0.0.0.0 0.0.0.0 203.0.113.1 //配置静态缺省路由的下一跳指向公网提供的IP地址203.0.113.1# 配置安全区域。
[USG6600] firewall zone trust
[USG6600-zone-trust] add interface gigabitethernet 1/0/1
[USG6600-zone-trust] add interface vlanif 2
[USG6600-zone-trust] add interface vlanif 3
[USG6600-zone-trust] quit
[USG6600] firewall zone untrust
[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 0 203.0.113.2 203.0.113.2 //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203.0.113.1/24，网关为203.0.113.2。
配置完成后，PC1和PC2都可以Ping通外网的IP 203.0.113.1/24，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
#
interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 3
#
interface GigabitEthernet0/0/2
port link-type access
port default vlan 2
#
interface GigabitEthernet0/0/3
port link-type access
port default vlan 3
#
return- USG的配置文件（防火墙通过子接口进行三层转发的配置文件）
#
interface GigabitEthernet1/0/1
#
interface GigabitEthernet1/0/1.1
vlan-type dot1q 2
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 GigabitEthernet1/0/1.2
vlan-type dot1q 3
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 GigabitEthernet1/0/2
ip address 203.0.113.2 255.255.255.0
#
firewall zone trust
set priority 85
add interface GigabitEthernet1/0/1
add interface GigabitEthernet1/0/1.1
add interface GigabitEthernet1/0/1.2
#
firewall zone untrust
set priority 5
add interface GigabitEthernet1/0/2
#
ip route-static 0.0.0.0 0.0.0.0 203.0.113.1
#
nat address-group addressgroup1 0
mode pat route enable section 0 203.0.113.2 203.0.113.2
#
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- USG的配置文件（防火墙通过VLANIF接口进行三层转发的配置文件）
#
vlan batch 2 to 3
#
interface Vlanif2
ip address 192.168.1.1 255.255.255.0
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 GigabitEthernet1/0/1
portswitch
port hybrid tagged vlan 2 to 3
#
interface GigabitEthernet1/0/2
ip address 203.0.113.2 255.255.255.0
#
firewall zone trust
set priority 85
add interface GigabitEthernet1/0/1
add interface Vlanif2
add interface Vlanif3
#
firewall zone untrust
set priority 5
add interface GigabitEthernet1/0/2
#
ip route-static 0.0.0.0 0.0.0.0 203.0.113.1
#
nat address-group addressgroup1 0
mode pat
route enable
section 0 203.0.113.2 203.0.113.2
#
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
#
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