From North America/Europe, it appears that yahoo.cn is subject to keyword filtering and google.cn is not. What does this mean?
We are not sure. If you know, or have tested this from another continent, please e-mail us (conceptREMOVECAPITALSdoppler@gmail.com). One possibility is that there is a router between where you are testing from and yahoo.cn where keyword filtering is being applied, but there is no such router between your source location and google.cn. Whether keyword filtering is applied depends on the path that the packets take, and whether that path contains at least one router that performs keyword filtering. For example, we see keyword filtering of GET requests destined for yahoo.cn, but there is apparently no filtering of HTML responses from yahoo.cn, not even for keywords that we know to be filtered in HTML responses coming from other places. Internet routes are often assymetric, meaning that there may be a filtering router along our route to yahoo.cn but no filtering router along yahoo.cn’s route to us. Another possible explanation as to why google.cn does not seem to be subject to keyword filte
