Where is Ping's `round-trip time` stored in the IP header?

The name of the pictureThe name of the pictureThe name of the pictureClash Royale CLAN TAG#URR8PPP











up vote
1
down vote

favorite












If we use ICMP's ping, we know the TTL and round-trip time are stored in the IP header, in the below IP header map we know TTL's location, but where does the round-trip time?



enter image description here



Does it will be stored in the Options?






protocol-theory ping icmp







share|improve this question



























    up vote
    1
    down vote

    favorite












    If we use ICMP's ping, we know the TTL and round-trip time are stored in the IP header, in the below IP header map we know TTL's location, but where does the round-trip time?



    enter image description here



    Does it will be stored in the Options?






    protocol-theory ping icmp







    share|improve this question

























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      If we use ICMP's ping, we know the TTL and round-trip time are stored in the IP header, in the below IP header map we know TTL's location, but where does the round-trip time?



      enter image description here



      Does it will be stored in the Options?






      protocol-theory ping icmp







      share|improve this question















      If we use ICMP's ping, we know the TTL and round-trip time are stored in the IP header, in the below IP header map we know TTL's location, but where does the round-trip time?



      enter image description here



      Does it will be stored in the Options?






      protocol-theory ping icmp




      protocol-theory ping icmp






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 35 mins ago









      jonathanjo

      5,330222




      5,330222










      asked 48 mins ago









      aircraft

      1658




      1658




















          1 Answer
          1






          active

          oldest

          votes

















          up vote
          3
          down vote



          accepted










          The round trip time is not actually stored anywhere. The sending host remembers the time it sends each ICMP Echo Request packet, using the 16-bit identification field. When it gets the ICMP Echo Reply, it notes the current time, and uses the identification field of the reply to look up when the Echo Request was sent, calculates the difference, and reports it.






          share|improve this answer






















            Your Answer







            StackExchange.ready(function()
            var channelOptions =
            tags: "".split(" "),
            id: "496"
            ;
            initTagRenderer("".split(" "), "".split(" "), channelOptions);

            StackExchange.using("externalEditor", function()
            // Have to fire editor after snippets, if snippets enabled
            if (StackExchange.settings.snippets.snippetsEnabled)
            StackExchange.using("snippets", function()
            createEditor();
            );

            else
            createEditor();

            );

            function createEditor()
            StackExchange.prepareEditor(
            heartbeatType: 'answer',
            convertImagesToLinks: false,
            noModals: false,
            showLowRepImageUploadWarning: true,
            reputationToPostImages: null,
            bindNavPrevention: true,
            postfix: "",
            noCode: true, onDemand: true,
            discardSelector: ".discard-answer"
            ,immediatelyShowMarkdownHelp:true
            );



            );













             

            draft saved


            draft discarded


















            StackExchange.ready(
            function ()
            StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fnetworkengineering.stackexchange.com%2fquestions%2f53253%2fwhere-is-pings-round-trip-time-stored-in-the-ip-header%23new-answer', 'question_page');

            );

            Post as a guest

















            1 Answer
            1






            active

            oldest

            votes








            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes








            up vote
            3
            down vote



            accepted










            The round trip time is not actually stored anywhere. The sending host remembers the time it sends each ICMP Echo Request packet, using the 16-bit identification field. When it gets the ICMP Echo Reply, it notes the current time, and uses the identification field of the reply to look up when the Echo Request was sent, calculates the difference, and reports it.






            share|improve this answer


























              up vote
              3
              down vote



              accepted










              The round trip time is not actually stored anywhere. The sending host remembers the time it sends each ICMP Echo Request packet, using the 16-bit identification field. When it gets the ICMP Echo Reply, it notes the current time, and uses the identification field of the reply to look up when the Echo Request was sent, calculates the difference, and reports it.






              share|improve this answer
























                up vote
                3
                down vote



                accepted







                up vote
                3
                down vote



                accepted






                The round trip time is not actually stored anywhere. The sending host remembers the time it sends each ICMP Echo Request packet, using the 16-bit identification field. When it gets the ICMP Echo Reply, it notes the current time, and uses the identification field of the reply to look up when the Echo Request was sent, calculates the difference, and reports it.






                share|improve this answer














                The round trip time is not actually stored anywhere. The sending host remembers the time it sends each ICMP Echo Request packet, using the 16-bit identification field. When it gets the ICMP Echo Reply, it notes the current time, and uses the identification field of the reply to look up when the Echo Request was sent, calculates the difference, and reports it.







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 31 mins ago

























                answered 37 mins ago









                jonathanjo

                5,330222




                5,330222



























                     

                    draft saved


                    draft discarded















































                     


                    draft saved


                    draft discarded














                    StackExchange.ready(
                    function ()
                    StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fnetworkengineering.stackexchange.com%2fquestions%2f53253%2fwhere-is-pings-round-trip-time-stored-in-the-ip-header%23new-answer', 'question_page');

                    );

                    Post as a guest
































































                    Comments

                    Post a Comment

                    Popular posts from this blog

                    What does second last employer means? [closed]

                    Image
                    Clash Royale CLAN TAG #URR8PPP .everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty margin-bottom:0; up vote -3 down vote favorite Say, for example I have worked in the following companies, Company A => 2010 - 2011 Company B => 2011 - 2012 Company C => 2012 - Till Date Company D => Have offer Now assume Company D is asking to submit documents from my second last employer. So from the list of companies given, which company would be qualified as second last employer? software-industry employer share | improve this question asked Aug 10 '14 at 5:16 Rajaprabhu Aravindasamy 559 1 6 13 closed as off-topic by Jim G., jmort253 ♦ Aug 11 '14 at 1:58 This question appears to be off-topic. The users who voted to close gave this specific reason: "Questions seeking advice on company-specific regulations, agreements, or policies should be directed to your manager or HR department. Questions that address...
                    Read more

                    List of Gilmore Girls characters

                    Image
                    The season three cast—(Back row): Lane, Michel, Paris, Emily, Richard, Sookie, Miss Patty, Kirk; Front row: Jess, Luke, Lorelai, Rory, Dean This is a list of characters for the comedy-drama television series Gilmore Girls . Contents 1 Main characters 1.1 Lorelai Gilmore 1.2 Rory Gilmore 1.3 Sookie St. James 1.4 Lane Kim 1.5 Michel Gerard 1.6 Luke Danes 1.7 Emily Gilmore 1.8 Richard Gilmore 1.9 Paris Geller 1.10 Dean Forester 1.11 Jess Mariano 1.12 Kirk Gleason 1.13 Jason Stiles 1.14 Logan Huntzberger 2 Major recurring characters 2.1 Christopher Hayden 2.2 Jackson Belleville 2.3 Mrs. Kim 2.4 Tristin DuGray 2.5 Max Medina 2.6 Taylor Doose 2.7 Dave Rygalski 2.8 Marty 3 Recurring characters 3.1 Stars Hollow 3.2 Chilton 3.3 Yale 3.4 Other 4 Notable guest stars 5 Unseen characters 6 Notes 7 References Main characters Actor Character Appearances Season 1 Season 2 Season 3 Season 4 Season 5 Season 6 Season 7 A Year in the Life Lauren Graham Lorelai Gilmore...
                    Read more

                    One-line joke

                    A one-liner is a joke that is delivered in a single line. A good one-liner is said to be pithy - concise and meaningful. [1] Comedians and actors use this comedic method as part of their act, e.g. Jimmy Carr, Tommy Cooper, Rodney Dangerfield, Norm Macdonald, Ken Dodd, Stewart Francis, Zach Galifianakis, Mitch Hedberg, Anthony Jeselnik, Milton Jones, Shappi Khorsandi, Jay London, Mark Linn-Baker, Demetri Martin, Groucho Marx, Dan Mintz, Emo Philips, Tim Vine, Steven Wright and Henny Youngman and Arnold Schwarzenegger. [ citation needed ] Many fictional characters are also known to deliver one-liners, including James Bond, who usually includes pithy and laconic quips after disposing of a villain. [ citation needed ] Examples "A baby seal walks into a club." "A dyslexic man walks into a bra." (Anonymous) "There are three types of people, those who can count and those who can't." "Venison's dear, isn't it?" (Jimmy Carr) "An escala...
                    Read more