IIS maxBandwidth don't limit upload

hi

i want to limit upload and download in IIS. i set

maxBandwidth

to 2000. this limit work for download correctly. but when upload file this limit don't work.

Note that in my web.config file i set:

<system.web><httpRuntime maxRequestLength="2147483647" executionTimeout="3600" /></system.web><system.webserver><security><requestFiltering><requestLimits maxAllowedContentLength="4249967295" /></requestFiltering></security></system.webserver>

when i remove this line upload is limited but when add this lines uploud bandwidth is unlimited.

so how can i limit upload bandwidth in IIS?