My computer is in intranet. I can visit http://www.baidu.com , see

But it is unable to ping or tracert , see


Could anyone explain why ?
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Many ISPs filter out ICMP (which is what ping/tracert on windows uses). It can also be that your router @home does only partial NAT of your connections and only allows some standard user protocols like HTTP/FTP/whatnot.
There’s nothing to be alarmed of really, it’s fairly normal, so unless you have a particular reason you want this to work – it should have no impact on your browsing experience.