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urgent flag (URG)

The Urgent Flag (URG) is a bit indicator in the Control Flag field of the TCP header. If an Urgent Flag is set, the marked data must be processed further with the Urgent Data SignallingService.

Urgent

flag in the TCP header

flag in the TCP header

The Transmission Control Protocol (TCP) supports Urgent data of any length and informs the application program how much Urgent data is still in the receive buffer.

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Englisch: urgent flag - URG
Updated at: 24.09.2018
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