网络/国际托管 ping 和跟踪路由
我正在开展一个项目，涉及服务器距离与 ping 和跟踪路由的相关性。所以我得到了不同网站的跳数和平均 ping 时间。我使用 PuTTy 和 unix 代码来实现此目的，当我跟踪网站 (traceroute australia.gov.au -m 255) 时，我允许最大跳数。我得到大约 18 跳，然后得到 237 个数字，旁边有三个星号。起初我认为这是该命令的 -m 255 扩展的结果，但在 YouTube 或 google 等网站上不会出现这种情况。这是超时/连接吗？另外，当我 ping 这个网站（ping australia.gov.au -c 25）时，大约一分钟（接近 2000 毫秒）没有得到任何响应，然后打印输出显示发送了 25 个数据包，收到了 0 个数据包，解释是什么为了这？
I am working on a project involving correlations in distance of the server in relation to pings and traceroutes. So I am getting the number of hops and the average ping time for different web sites. I am using puTTy and unix code to achieve this, when I traceroute the website (traceroute australia.gov.au -m 255) I allow for the maximum number of hops. I get about 18 hops, and then i get 237 numbers with three asterisks next to them. At first I assumed that this was a result of the -m 255 extension to the command, but it doesn't occur with websites like youtube or google. Is this timed out hops/connections? Also when i ping this website (ping australia.gov.au -c 25), I get no respsonse for about a minute (near 2000ms) and then the print out says that 25 packets were sent and 0 were received, what is the explanation for this?
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互联网上的很多地方都会阻止 ICMP，这意味着
australia.gov.au可能拥有有效的可路由 IP，但只是不发回回显回复。据我所知，
traceroute中的三个星号行表示具有给定 TTL 的数据包没有得到回复。这可能再次表明主机/路由器不希望被回复任意 ICMP 和/或 UDP 数据包所打扰。Lots of places all over the internet block ICMP, meaning that
australia.gov.aumight have a valid routable IP, but just doesn't send backecho reply.Three asterisks line from
traceroute, as far as I can remember, means a packet with given TTL did not get a reply. That again probably indicates that the host/router does not want to be bothered replying to arbitrary ICMP and/or UDP packets.