Query regarding traceroute and ping

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While executing the traceroute command, why does the route to same host change at different times of the day?



Why does traceroute not find complete paths to some hosts?



Is it possible to find the route to certain hosts which fail to respond with the ping command?







share|improve this question


























    up vote
    1
    down vote

    favorite
    1












    While executing the traceroute command, why does the route to same host change at different times of the day?



    Why does traceroute not find complete paths to some hosts?



    Is it possible to find the route to certain hosts which fail to respond with the ping command?







    share|improve this question
























      up vote
      1
      down vote

      favorite
      1









      up vote
      1
      down vote

      favorite
      1






      1





      While executing the traceroute command, why does the route to same host change at different times of the day?



      Why does traceroute not find complete paths to some hosts?



      Is it possible to find the route to certain hosts which fail to respond with the ping command?







      share|improve this question














      While executing the traceroute command, why does the route to same host change at different times of the day?



      Why does traceroute not find complete paths to some hosts?



      Is it possible to find the route to certain hosts which fail to respond with the ping command?









      share|improve this question













      share|improve this question




      share|improve this question








      edited Jan 30 at 11:31









      Rui F Ribeiro

      35.1k1269113




      35.1k1269113










      asked Jan 30 at 10:49









      Bibhas Ranjan Das

      112




      112




















          1 Answer
          1






          active

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          up vote
          3
          down vote













          That's just how the internet works, I am afraid.



          Routes can vary in the Internet as the paths are redundant, there are routers/firewalls along the way blocking things for security reasons and even hosts can refuse ICMP packets (pings).



          As for the path(s), it is not even guaranteed the packets of a whole TCP transaction with go through the same path.



          You can do as pretty much a traceroute based in TCP or UDP packets besides ICMP, if ICMP is being blocked.



          For instance:



          sudo tcptraceroute www.cnn.com 80


          See How to: Running a TCP Traceroute






          share|improve this answer






















          • off-topic here: get the book TCP/IP illustrated vol I.- the protocols from Stevens
            – Rui F Ribeiro
            Jan 30 at 11:33











          • "doubts" is an odd word choice there. quirks, maybe. or possibly "That's just how the internet works".
            – cas
            Jan 30 at 11:36










          • @cas Shamelessly stolen, thanks.
            – Rui F Ribeiro
            Jan 30 at 11:37










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          1 Answer
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          1 Answer
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          active

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          up vote
          3
          down vote













          That's just how the internet works, I am afraid.



          Routes can vary in the Internet as the paths are redundant, there are routers/firewalls along the way blocking things for security reasons and even hosts can refuse ICMP packets (pings).



          As for the path(s), it is not even guaranteed the packets of a whole TCP transaction with go through the same path.



          You can do as pretty much a traceroute based in TCP or UDP packets besides ICMP, if ICMP is being blocked.



          For instance:



          sudo tcptraceroute www.cnn.com 80


          See How to: Running a TCP Traceroute






          share|improve this answer






















          • off-topic here: get the book TCP/IP illustrated vol I.- the protocols from Stevens
            – Rui F Ribeiro
            Jan 30 at 11:33











          • "doubts" is an odd word choice there. quirks, maybe. or possibly "That's just how the internet works".
            – cas
            Jan 30 at 11:36










          • @cas Shamelessly stolen, thanks.
            – Rui F Ribeiro
            Jan 30 at 11:37














          up vote
          3
          down vote













          That's just how the internet works, I am afraid.



          Routes can vary in the Internet as the paths are redundant, there are routers/firewalls along the way blocking things for security reasons and even hosts can refuse ICMP packets (pings).



          As for the path(s), it is not even guaranteed the packets of a whole TCP transaction with go through the same path.



          You can do as pretty much a traceroute based in TCP or UDP packets besides ICMP, if ICMP is being blocked.



          For instance:



          sudo tcptraceroute www.cnn.com 80


          See How to: Running a TCP Traceroute






          share|improve this answer






















          • off-topic here: get the book TCP/IP illustrated vol I.- the protocols from Stevens
            – Rui F Ribeiro
            Jan 30 at 11:33











          • "doubts" is an odd word choice there. quirks, maybe. or possibly "That's just how the internet works".
            – cas
            Jan 30 at 11:36










          • @cas Shamelessly stolen, thanks.
            – Rui F Ribeiro
            Jan 30 at 11:37












          up vote
          3
          down vote










          up vote
          3
          down vote









          That's just how the internet works, I am afraid.



          Routes can vary in the Internet as the paths are redundant, there are routers/firewalls along the way blocking things for security reasons and even hosts can refuse ICMP packets (pings).



          As for the path(s), it is not even guaranteed the packets of a whole TCP transaction with go through the same path.



          You can do as pretty much a traceroute based in TCP or UDP packets besides ICMP, if ICMP is being blocked.



          For instance:



          sudo tcptraceroute www.cnn.com 80


          See How to: Running a TCP Traceroute






          share|improve this answer














          That's just how the internet works, I am afraid.



          Routes can vary in the Internet as the paths are redundant, there are routers/firewalls along the way blocking things for security reasons and even hosts can refuse ICMP packets (pings).



          As for the path(s), it is not even guaranteed the packets of a whole TCP transaction with go through the same path.



          You can do as pretty much a traceroute based in TCP or UDP packets besides ICMP, if ICMP is being blocked.



          For instance:



          sudo tcptraceroute www.cnn.com 80


          See How to: Running a TCP Traceroute







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Jan 30 at 13:00

























          answered Jan 30 at 11:30









          Rui F Ribeiro

          35.1k1269113




          35.1k1269113











          • off-topic here: get the book TCP/IP illustrated vol I.- the protocols from Stevens
            – Rui F Ribeiro
            Jan 30 at 11:33











          • "doubts" is an odd word choice there. quirks, maybe. or possibly "That's just how the internet works".
            – cas
            Jan 30 at 11:36










          • @cas Shamelessly stolen, thanks.
            – Rui F Ribeiro
            Jan 30 at 11:37
















          • off-topic here: get the book TCP/IP illustrated vol I.- the protocols from Stevens
            – Rui F Ribeiro
            Jan 30 at 11:33











          • "doubts" is an odd word choice there. quirks, maybe. or possibly "That's just how the internet works".
            – cas
            Jan 30 at 11:36










          • @cas Shamelessly stolen, thanks.
            – Rui F Ribeiro
            Jan 30 at 11:37















          off-topic here: get the book TCP/IP illustrated vol I.- the protocols from Stevens
          – Rui F Ribeiro
          Jan 30 at 11:33





          off-topic here: get the book TCP/IP illustrated vol I.- the protocols from Stevens
          – Rui F Ribeiro
          Jan 30 at 11:33













          "doubts" is an odd word choice there. quirks, maybe. or possibly "That's just how the internet works".
          – cas
          Jan 30 at 11:36




          "doubts" is an odd word choice there. quirks, maybe. or possibly "That's just how the internet works".
          – cas
          Jan 30 at 11:36












          @cas Shamelessly stolen, thanks.
          – Rui F Ribeiro
          Jan 30 at 11:37




          @cas Shamelessly stolen, thanks.
          – Rui F Ribeiro
          Jan 30 at 11:37












           

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