Ethernet padding value

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When the data sent in an Ethernet frame is less than 46 bytes, extra padding needs to be added to the payload. The question is:



  • Which is the value of that Ethernet padding?

I'm asking since in real captures I checked this padding seems random, i.e. a changing combination of 1s and 0s.






ethernet







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    When the data sent in an Ethernet frame is less than 46 bytes, extra padding needs to be added to the payload. The question is:



    • Which is the value of that Ethernet padding?

    I'm asking since in real captures I checked this padding seems random, i.e. a changing combination of 1s and 0s.






    ethernet







    share|improve this question







    New contributor




    Boni García is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.





















      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      When the data sent in an Ethernet frame is less than 46 bytes, extra padding needs to be added to the payload. The question is:



      • Which is the value of that Ethernet padding?

      I'm asking since in real captures I checked this padding seems random, i.e. a changing combination of 1s and 0s.






      ethernet







      share|improve this question







      New contributor




      Boni García is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      When the data sent in an Ethernet frame is less than 46 bytes, extra padding needs to be added to the payload. The question is:



      • Which is the value of that Ethernet padding?

      I'm asking since in real captures I checked this padding seems random, i.e. a changing combination of 1s and 0s.






      ethernet




      ethernet






      share|improve this question







      New contributor




      Boni García is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      share|improve this question







      New contributor




      Boni García is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.









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      asked 1 hour ago









      Boni García

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      1062




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      Boni García is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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          2 Answers
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          IEEE 802 packets may have a minimum size restriction. When necessary, the data field should be padded (with octets of zero) to meet the IEEE 802 minimum frame size requirements. This padding is not part of the IP datagram and is not included in the total length field of the IP header.






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            The padding can have any values, decided by the network interface card, the operating system and the driver.



            Conservative OS might pad with zeros. Lazy OS might leave whatever was in those memory locations alone, and you'll see leftovers from the previous frame.






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              IEEE 802 packets may have a minimum size restriction. When necessary, the data field should be padded (with octets of zero) to meet the IEEE 802 minimum frame size requirements. This padding is not part of the IP datagram and is not included in the total length field of the IP header.






              share|improve this answer
























                up vote
                1
                down vote













                IEEE 802 packets may have a minimum size restriction. When necessary, the data field should be padded (with octets of zero) to meet the IEEE 802 minimum frame size requirements. This padding is not part of the IP datagram and is not included in the total length field of the IP header.






                share|improve this answer






















                  up vote
                  1
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                  up vote
                  1
                  down vote









                  IEEE 802 packets may have a minimum size restriction. When necessary, the data field should be padded (with octets of zero) to meet the IEEE 802 minimum frame size requirements. This padding is not part of the IP datagram and is not included in the total length field of the IP header.






                  share|improve this answer












                  IEEE 802 packets may have a minimum size restriction. When necessary, the data field should be padded (with octets of zero) to meet the IEEE 802 minimum frame size requirements. This padding is not part of the IP datagram and is not included in the total length field of the IP header.







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                  answered 56 mins ago









                  Datagram.Network

                  1,153313




                  1,153313




















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                      1
                      down vote













                      The padding can have any values, decided by the network interface card, the operating system and the driver.



                      Conservative OS might pad with zeros. Lazy OS might leave whatever was in those memory locations alone, and you'll see leftovers from the previous frame.






                      share|improve this answer
























                        up vote
                        1
                        down vote













                        The padding can have any values, decided by the network interface card, the operating system and the driver.



                        Conservative OS might pad with zeros. Lazy OS might leave whatever was in those memory locations alone, and you'll see leftovers from the previous frame.






                        share|improve this answer






















                          up vote
                          1
                          down vote










                          up vote
                          1
                          down vote









                          The padding can have any values, decided by the network interface card, the operating system and the driver.



                          Conservative OS might pad with zeros. Lazy OS might leave whatever was in those memory locations alone, and you'll see leftovers from the previous frame.






                          share|improve this answer












                          The padding can have any values, decided by the network interface card, the operating system and the driver.



                          Conservative OS might pad with zeros. Lazy OS might leave whatever was in those memory locations alone, and you'll see leftovers from the previous frame.







                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered 40 mins ago









                          jonathanjo

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