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I am encountering a strange problem. Its about this website. If you see its tracert report, you will notice that 4 router towards the end is not responding, despite this, the request reaches its destination and the website is delivered to the client.

Can someone put some light to the situation and explain what is going on here?

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up vote 2 down vote accepted

Traceroutes don't necessarily show all hops in the network, because some routers don't react correctly to provide the necessary data for traceroute to do it's job.

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So, you mean those routers are actually responding, although the tracert report gave a not responding report. –  Starx Jul 17 '11 at 12:11
    
It depends on what you mean by "responding". They're certainly routing, which is the important bit, they're just not responding correctly to the packets that traceroute is using. –  womble Jul 17 '11 at 12:14
    
This might be silly, but if i ping one of those routers like vl911.core5a.lon3.rackspace.net, it's again not responding. So, by what you mean, that router is also not responding to the ping packet, not just tracert SYN packet. –  Starx Jul 17 '11 at 12:21
    
Yes, of course. But traceroute doesn't usually use TCP SYN packets, it uses UDP. –  womble Jul 17 '11 at 12:26
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Buy Rackspace? That traceroute doesn't show the full path doesn't matter, the routers are working correctly. –  womble Jul 17 '11 at 12:35
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