华为二层交换机与防火墙配置上网示例

二层交换机与防火墙对接上网配置示例

组网图形

华为二层交换机与防火墙配置上网示例_第1张图片

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:

  1. 配置交换机基于接口划分VLAN,实现二层转发。

  2. 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。

  3. 配置防火墙作为DHCP服务器,为用户PC分配IP地址。

  4. 开启防火墙域间安全策略,使不同域的报文可以相互转发。

  5. 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
  1. 配置交换机

    # 配置下行连接用户的接口。

     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
  2. 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。

       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。

       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
  3. 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                                 
    # 
    return
    

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