how the fwmark works together with mask in ip rule command

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I try to understand how the ip rule add fwmark works together with mask,



for example:
ip rule command show the following rule:
100: from all fwmark 0xd00/0xffffff00 lookup 6017



so if there a packet with mark "0xd70" arrives, it will try to match the mark in the ip rules, but how the "0xd70" is calucated with the fwmark and the mask "0xd00/0xffffff00"?



Thank you!




linux ip




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    up vote
    0
    down vote

    favorite












    I try to understand how the ip rule add fwmark works together with mask,



    for example:
    ip rule command show the following rule:
    100: from all fwmark 0xd00/0xffffff00 lookup 6017



    so if there a packet with mark "0xd70" arrives, it will try to match the mark in the ip rules, but how the "0xd70" is calucated with the fwmark and the mask "0xd00/0xffffff00"?



    Thank you!




    linux ip




    share|improve this question






















      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I try to understand how the ip rule add fwmark works together with mask,



      for example:
      ip rule command show the following rule:
      100: from all fwmark 0xd00/0xffffff00 lookup 6017



      so if there a packet with mark "0xd70" arrives, it will try to match the mark in the ip rules, but how the "0xd70" is calucated with the fwmark and the mask "0xd00/0xffffff00"?



      Thank you!




      linux ip




      share|improve this question












      I try to understand how the ip rule add fwmark works together with mask,



      for example:
      ip rule command show the following rule:
      100: from all fwmark 0xd00/0xffffff00 lookup 6017



      so if there a packet with mark "0xd70" arrives, it will try to match the mark in the ip rules, but how the "0xd70" is calucated with the fwmark and the mask "0xd00/0xffffff00"?



      Thank you!





      linux ip





      share|improve this question











      share|improve this question




      share|improve this question










      asked Apr 10 at 15:12









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