When a host needs to resend a packet (whatever the payload), is there any field in the header that gets modified, so that you can tell that it is a duplicate packet?
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When a host needs to resend a packet (whatever the payload), is there any field in the header that gets modified, so that you can tell that it is a duplicate packet?
No. IP packet are not resent, that’s a function of the higher protocol layers.
Some transport protocols, e.g. TCP or SCTP have retransmission built into them that re-sends packets at that protocol layer, some application protocols, e.g. DNS, applies retransmission at the application protocol layer.
The IP layer does not know or care about this, there is no protocol fields that identifies a retransmission from a higher layer.