Cisco三层vlan与路由配置

要求整个网络可以访问互联网，使用NAT转换2017年6月30日14:13


1、用Internet路由器模仿公网路由，配置如下 Router>enableRouter#config tEnter configurationcommands, one per line. End with CNTL/Z.Router(config)#inters1/0Router(config-if)#ipadd 1.1.1.1 255.255.255.0Router(config-if)#clockrate 6400Router(config-if)#noshutdown模拟公网路由器配置完成 2、配置企业路由器 配置连接公网的接口IP地址把接口定义为outside Router>enableRouter#config tEnter configurationcommands, one per line. End with CNTL/Z.Router(config)#inters1/1Router(config-if)#ipadd 1.1.1.2 255.255.255.0Router(config-if)#noshutdown Router(config-if)#%LINK-5-CHANGED:Interface Serial1/1, changed state to up %LINEPROTO-5-UPDOWN:Line protocol on Interface Serial1/1, changed state to up Router(config-if)#ip nat outside 配置连接三层交换机接口IP地址把接口定义为insideRouter(config)#interf0/0Router(config-if)#ipadd 172.16.1.2 255.255.255.0Router(config-if)#noshutdown Router(config-if)#%LINK-5-CHANGED:Interface FastEthernet0/0, changed state to up %LINEPROTO-5-UPDOWN:Line protocol on Interface FastEthernet0/0, changed state to up Router(config-if)#ip nat inside 配置acl访问控制列表，不配置无法访问通过路由访问公网（这里特别重要）如果不把所有要允许访问公网的网段配置成允许访问的状态，路由器就会阻止这些网段访问公网Router(config)#access-list10 permit 192.168.1.0 0.0.0.255Router(config)#access-list10 permit 192.168.2.0 0.0.0.255Router(config)#access-list10 permit 192.168.3.0 0.0.0.255 配置NAT地址转换Router(config)#ip natinside source list 10 interface s1/1 overload 3、配置三层交换机 创建一个vlan5用来配置与路由连接的地址，并把f0/1划入vlan5 Switch(config)#vlan 5 Switch(config)#interf0/1Switch(config-if)#switSwitch(config-if)#switchportmoSwitch(config-if)#switchportmode accSwitch(config-if)#switchportmode accessSwitch(config-if)#swacSwitch(config-if)#swaccess vlan 5 配置vlan地址Switch(config-if)#intervlan 5Switch(config-if)#%LINK-5-CHANGED:Interface Vlan5, changed state to up %LINEPROTO-5-UPDOWN:Line protocol on Interface Vlan5, changed state to up Switch(config-if)#ipadd 172.16.1.1 255.255.255.0Switch(config-if)#noshutdown 把其它vlan也配置好配置Vlan2Switch(config)#interf0/2Switch(config-if)#swmo accSwitch(config-if)#swacc vlan 2Switch(config-if)#intervlan 2Switch(config-if)#%LINK-5-CHANGED:Interface Vlan2, changed state to up %LINEPROTO-5-UPDOWN:Line protocol on Interface Vlan2, changed state to up Switch(config-if)#ipadd 192.168.1.254 255.255.255.0Switch(config-if)#noshutSwitch(config-if)# 配置Vlan3Switch(config-if)#noshutSwitch(config-if)#interf0/3Switch(config-if)#swmo accSwitch(config-if)#swacc vlan 3Switch(config-if)#intervlan 3Switch(config-if)#%LINK-5-CHANGED:Interface Vlan3, changed state to up %LINEPROTO-5-UPDOWN:Line protocol on Interface Vlan3, changed state to up Switch(config-if)#ipadd 192.168.2.254 255.255.255.0 配置Vlan4 Switch(config-if)#interf0/4Switch(config-if)#swmo accSwitch(config-if)#swacc vlan 4Switch(config-if)#intervlan 4Switch(config-if)#%LINK-5-CHANGED:Interface Vlan4, changed state to up %LINEPROTO-5-UPDOWN:Line protocol on Interface Vlan4, changed state to up Switch(config-if)#ipadd 192.168.3.254 255.255.255.0 配置DHCP服务器 配置vlan2DHCP服务器Switch(config)#ipdhcp pool vlan2Switch(dhcp-config)#default-router192.168.1.254Switch(dhcp-config)#dns-server1.1.1.1Switch(dhcp-config)#network192.168.1.0 255.255.255.0Switch(dhcp-config)#exit 配置vlan3DHCP服务器Switch(config)#ipdhcp pool vlan3Switch(dhcp-config)#default-router192.168.2.254Switch(dhcp-config)#dns-server2.2.2.2Switch(dhcp-config)#network192.168.2.0 255.255.255.0Switch(dhcp-config)#exit 配置vlan4DHCP服务器Switch(config)#ipdhcp pool vlan4Switch(dhcp-config)#default-router192.168.3.254Switch(dhcp-config)#dns-server3.3.3.3Switch(dhcp-config)#network192.168.3.0 255.255.255.0Switch(dhcp-config)#exit 开启三层交换机路由功能 ip routing 到这里所有的vlan间的电脑已经能够相互ping通了，但是还是不能访问互联网，因为路由还没有配置完成