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?
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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.