前段時間一直有客戶問我路由器可不可以做到限制內部某些機子的下行速率，我很自然的答了句：可以做限速的。其實限速肯定是可以的，但是需要考慮一個具體的問題
一般接入路由器都作了地址轉換，但是了解到路由器的操作步驟會發現如下的執行步驟：
check input rate limits ------->nat outside to inside------->check output rate limits
所以針對內部部分主機做限速策略，由于必須在ACL里面指定inside local 地址，所以應該在內網接口上應用service-policy output xxx，而不是在外網接口上的service-policy input xxx！
下面是一個具體的例子：
Router#sh runBuilding configuration...Current configuration : 1026 bytes!version 12.2service timestamps debug datetime msecservice timestamps log datetime msecno service passWord-encryption!hostname Router!!ip subnet-zero!!no ip domain lookup!!class-map match-all test-classmatch access-group 100!!policy-map speedclass test-classpolice cir 80000 bc 32000conform-action transmitexceed-action drop!!!!!interface FastEthernet0/0ip address 192.168.1.111 255.255.255.0ip nat outsideduplex autospeed auto!interface FastEthernet0/1ip address 172.16.1.1 255.255.255.0ip nat insideduplex autospeed autoservice-policy output speed!ip nat inside source list 1 interface FastEthernet0/0 overload!ip classlessip route 0.0.0.0 0.0.0.0 192.168.1.1no ip http server!!access-list 1 permit anyaccess-list 100 deny ip any host 172.16.1.100access-list 100 permit ip any any!line con 0line aux 0line vty 0 4!! end
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