I am trying to use traceroute
unix program to find the route to a host.
I tried traceroute www.google.com
and I end up seeing only asterisks printed. Examples on the internet uses the same command and it seems to work well. I tried increasing the waitime
value using -w
switch. Still does not work.
This is the Round-Trip Time or the amount of time it took for the traceroute packets to reach that hop and receive a reply. You might notice one or more lines of your traceroute output is listed only with an asterisk (*). This means that the program did not receive any response from the router at that hop.
In the traceroute output you may see asterisk instead of response times. The asterisks indicate that the target server did not respond as traceroute expected before a timeout occurred - this does not always indicate packet loss.
As the tracerouting progresses, the records are displayed for you hop by hop. Actually, each hop is measured three times. (If you see an asterisk (*), this indicates a hop that exceeded some limit.)
There are several possible reasons a traceroute fails to reach the target server: The traceroute packets are blocked or rejected by a router in the path. Usually, the router immediately after the last visible hop is the one causing the blockage. Check the routing table and the status of this device.
Well, you get your answer almost a year later. I personally was wondering the same thing, so I did some googling and found this answer on webmasters.
If a packet is not acknowledged within the expected timeout, an asterisk is displayed.
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