TCP segment encapsulate it IP payload,if some way ip packet is lost in transmission.

some time IP packet will be fragmented,

i ask if this one fragment part will be lost in transmission.how can fix it?

all other packet will be drop?

  • 1
    At least I have no idea what you're asking...
    – Zac67
    Jul 31, 2018 at 16:03
  • 1
    It is still not clear what you’re asking
    – Ron Trunk
    Jul 31, 2018 at 16:09
  • fragmented ip packet,if drop in transmission TCP payload already drop?? Jul 31, 2018 at 16:10
  • Still no luck.. i dont get it.
    – user36472
    Jul 31, 2018 at 16:59
  • TCP segment go inside IP packets,there are many problems.ip packets can get dropped with TCP payload? Jul 31, 2018 at 17:12

1 Answer 1


If a fragment of a packet gets lost, the destination host will be unable to rebuild the packet, and the packet will be discarded.

IP is connectionless, and it has no facility to request missing fragments or packets. Upper-layer protocols or applications must request any missing packets to be resent, if necessary (for some protocols or applications, e.g. real-time, resending old data can be a bad thing). Connection-oriented protocols, e.g. TCP, will request any missing data, but connectionless protocols, e.g. UDP will not request missing data, so it would be up to the application or application-layer protocol to request missing data.

  • Any fragment part lost TCP help to request them again? Jul 31, 2018 at 17:17
  • this is missing fragment of a packet or sender ip packet? Jul 31, 2018 at 17:19
  • 1
    If a packet is dropped, then TCP would not get the segment that is the payload of the packet. TCP guarantees in-order data delivery, and it has a mechanism to request missing segment be resent from the source TCP.
    – Ron Maupin
    Jul 31, 2018 at 17:21
  • it's helpful answer Jul 31, 2018 at 17:28

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