[db:作者] 发表于 2025-7-26 14:03

实现内外网切换的两种方法?

如何实现内外网切换?这个无论是在弱电项目中,还是在我自己上网的电脑中,都有可能会遇到,内外网切换的用途非常广泛,通常的做法是抽拔网线,但是过于麻烦,本次我们就介绍两种方法来实现它。

一、使用route命令实现内外网切换
内外网切换与命令是分不开的,使用route命令可以轻松实现内外网切换,且灵活能够灵活使用。
问题:
笔记本上一张机械网卡,一张无线网卡, 一般笔记本都是这样的配置,都联上了内外与外网,其中外网网关是49.222.151.207,内网网关10.168.1.1,如何实现双网卡同时使用有线网上内网、无线网上外网?
http://p3.pstatp.com/large/pgc-image/RWRXsXi1mcKhRb
解决步骤:
第一步:设置无线网卡为默认路由网关。
步骤:无线网络连接属性—Internet协议(TCP/IP)-属性-高级,手动添加无线路由网关,添加自己的外网网关即关,跃点数为“1”,是最高优先级。到了这一步,如果有线连接,无线连接同时存在的话,所有的数据都是经由无线网卡处理的。
第二步:查看当前路由表
使用route print命令看一个0.0.0.0的网络目标分别映射你的外内网的网关。
http://p1.pstatp.com/large/pgc-image/RWRXsXzEaqPVK3
当然,这里面你也可以对当前的路由进行删除
http://p3.pstatp.com/large/pgc-image/RWRXsYK9m87IfV
第三步:
通过route命令将,将所有网段添加到外网网卡,为默认路由,即所有的ip都走外网。
http://p3.pstatp.com/large/pgc-image/RWRXsYYB6cmLQ9
显示查看路由表,查看是否添加成功。
http://p9.pstatp.com/large/pgc-image/RWRXsi16y0GjSX
第四步:
通过route命令将内网网段添加到内网网卡,内网使用,即10.168.0.0这个ip段走内网。
http://p1.pstatp.com/large/pgc-image/RWRXsiR7qhmeMy
显示查看路由表(route print命令),查看是否添加成功。
http://p1.pstatp.com/large/pgc-image/RWRXsihW1qusB
那么就设置成功了,整体的意思就是:
对于所有IP地址的访问,都从 49.222.151.207网关走;
但是,对于10.168.0.0开头的地址的访问,从10.168.1.1走。
这样,再也不用插拔网线这种粗鲁的方式来切换网络了。
补充:
1、为了加强大家的理解,弱电君补充一个小案例,
如果在电脑接网线时访问不了“10.26.6.x”开头的ip地址,但使用无线wifi却可以访问? 如何解决?
增加一个路由规定10.26.6.x网段都走本地连接的网关:
route -p add 10.26.6.0 mask 255.255.255.0 10.168.1.1
这条命令的作用是添加一条永久路由规则(如果不加“-p”参数则为临时路由,注销下次登录windows时就没有了),凡是访问“10.26.6.x”开头并且掩码是255.255.255.0的ip地址走10.168.1.1 这个网关。
明白原理了无论什么路由添加与删除都可以轻松设置了。
2、如果你不知道各网络接口的IP地址、网关地址,可以通过ipconfig/all命令获取。


二、使用ACL来实现内外网切换
我们除了上面使用route命令来实现之外,还可以通过acl控制来实现,这里面通过华为的一个实例来了解清楚。
portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">如何让企业的某个部分只能访问内网,不能访问外网,portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important;">为了保密,会使企业的部分网络禁止与外部通信。这个在企业实际应用中非常广泛,不断的有朋友问起,在我们弱电vip技术群中也是多次讨论到。

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inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">前天我们发布过用ruote命令实现,那有没有其它的方法呢?
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">这里面我们就需要用到ACL了,首先我们来了解下ACL,ACL即访问控制列表,那么它有什么作用呢?
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">ACL的作用portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">1、ACL可以限制网络流量、提高网络性能。例如,ACL可以根据数据包的协议,指定数据包的优先级。
portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">2、ACL提供对通信流量的控制手段。例如,ACL可以限定或简化路由更新信息的长度,从而限制通过路由器某一网段的通信流量。
portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">3、ACL是提供网络安全访问的基本手段。ACL允许主机A访问人力资源网络,而拒绝主机B访问。
portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">4、ACL可以在路由器端口处决定哪种类型的通信流量被转发或被阻塞。例如,用户可以允许E-mail通信流量被路由,拒绝所有的Telnet通信流量。
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">例如:
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">某部门要求只能使用 WWW 这个功能,就可以通过ACL实现;
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">又例如,
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">为了某部门的保密性,不允许其访问外网,也不允许外网访问它,就可以通过ACL实现。
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">那么我们来看下实例,如何实现使用 ACL 限制内网主机访问外网。
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portant;">portant; overflow-wrap: break-word !important;">1、案例
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">某公司通过交换机实现各部门之间的互连。现要求Switch能够禁止研发部和市场部的部分主机访问外网,防止公司机密泄露。以华为例。
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(217, 33, 66);">portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px;">1、拓扑图
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(217, 33, 66);">portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px;">2、配置思路
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">采用如下的思路在Switch上进行配置:
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">1、配置基本ACL和基于ACL的流分类,使设备可以对研发部与市场部的指定主机的 报文进行过滤。
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">2、配置流行为,拒绝匹配上ACL的报文通过。
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">3. 配置并应用流策略,使ACL和流行为生效。
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">步骤1 配置接口所属的VLAN以及接口的IP地址
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(0, 82, 255); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"># 创建VLAN10和VLAN20。
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> sysname Switch
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> vlan batch 10 20
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);"># 配置Switch的接口GE0/0/1、GE0/0/2为trunk类型接口,并分别加入VLAN10和 VLAN20;配置Switch的接口GE0/0/3为trunk类型接口,加入VLAN10和VLAN20。
inkMacSystemFont, ">
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> interface gigabitethernet 0/0/1
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> port link-type trunk
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> port trunk allow-pass vlan 10
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> quit
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> interface gigabitethernet 0/0/2
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> port link-type trunk
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> port trunk allow-pass vlan 20
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> quit
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> interface gigabitethernet 0/0/3
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> port link-type trunk
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> port trunk allow-pass vlan 10 20
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);"># 创建VLANIF10和VLANIF20,并配置各VLANIF接口的IP地址。
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> interface vlanif 10
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> ip address 10.1.1.1 24
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> interface vlanif 20
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> ip address 10.1.2.1 24
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">这里面普及下vlanif接口和vlan端口的区别:
portant; overflow-wrap: break-word !important; color: rgb(217, 33, 66);">portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important; font-family: -apple-system-font, BlinkMacSystemFont, ">(1)vlan端口:portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-family: -apple-system-font, BlinkMacSystemFont, ">是物理端口,通常我们通过配置access vlan 10 使某个物理接口属于vlan 10
portant; overflow-wrap: break-word !important; color: rgb(217, 33, 66);">portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important; font-family: -apple-system-font, BlinkMacSystemFont, ">(2)vlan if :portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-family: -apple-system-font, BlinkMacSystemFont, ">interface vlan 是逻辑端口,portant; overflow-wrap: break-word !important; font-family: -apple-system-font, BlinkMacSystemFont, ">通常这个接口地址作为vlan下面用户的网关。portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-family: -apple-system-font, BlinkMacSystemFont, ">
portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-family: -apple-system-font, BlinkMacSystemFont, ">
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">步骤2 配置ACL
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);"># 创建基本ACL 2001并配置ACL规则,拒绝源IP地址为10.1.1.11和10.1.2.12的主机的报 文通过。
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> acl 2001
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> rule deny source 10.1.1.11 0portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);">//禁止IP地址为10.1.1.11的主机访问外网 portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> rule deny source 10.1.2.12 0/portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);">/禁止IP地址为10.1.2.12的主机访问外网 portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> quit
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">步骤3 配置基于基本ACL的流分类
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);">#配置基于基本ACL的流分类 # 配置流分类tc1,对匹配ACL 2001的报文进行分类。portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> traffic classifier tc1 portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);"> //创建流分类 portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> if-match acl 2001portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);">//将ACL与流分类关联portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> quit
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">步骤4 配置流行为
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);"># 配置流行为tb1,动作为拒绝报文通过。
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> traffic behavior tb1 portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);"> //创建流行为portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> deny    portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);">   //配置流行为动作为拒绝报文通过 portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> quit
inkMacSystemFont, ">
inkMacSystemFont, ">portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">步骤5 配置流策略
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);"># 定义流策略,将流分类与流行为关联。
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> traffic policy tp1    portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);"> //创建流策略portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> classifier tc1 behavior tb1    portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);"> //将流分类tc1与流行为tb1关联 portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> quit
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">步骤6 在接口下应用流策略
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);"># 由于内网主机访问外网的流量均从接口GE0/0/3出口流向Internet,所以可以在接口 GE0/0/3的出方向应用流策略。
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> interface gigabitethernet 0/0/3
inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> traffic-policy tp1 outboundportant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px; color: rgb(0, 82, 255);">//流策略应用在接口出方向 portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(217, 33, 66);">portant; overflow-wrap: break-word !important;">portant; overflow-wrap: break-word !important; font-size: 15px; letter-spacing: 2px; text-indent: 30px;">3、验收配置结果
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inkMacSystemFont, ">portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;"> IP地址为10.1.1.11和10.1.2.12的主机无法访问外网,其他主机均可以访问外网。portant; overflow-wrap: break-word !important; color: rgb(84, 84, 84); font-size: 15px; letter-spacing: 2px; text-indent: 30px;">
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