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Old 06-02-2014, 03:27 PM   #1
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Can ping, but cant traceroute

Hey guys,

I have a problem. There is an external system that I can ping to, but when I run a traceroute I get nothing back.

Any ideas? Because I dont have a clue.

Thanks in advance
Old 06-02-2014, 03:59 PM   #2
Ser Olmy
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ping sends ICMP Echo Request packets, and expects to see ICMP Echo Replies from the target.

traceroute on the Unix/Linux/*BSD platform sends UDP packets to a high UDP port (typically in the range 33434-33534) with increasing TTL values, and expects to see ICMP Time Exceeded messages from every router along the path and finally an ICMP Port Unreachable error when the packet reaches its destination.

As you can see, the two commands work in entirely different ways. There's nothing unusual about one command working and the other failing. Perhaps your UDP probes are being blocked by a filter or firewall.


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