SYN
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Syn packet, a session establishment
request. The first part of any TCP connection.
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ACK
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Ack packet, used to acknowledge the
receipt of data from the sender. May appear in conjunction with other flags.
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FIN
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Finish flag, used to indicate the sender's
intention to terminate the connection to the receiving host.
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RESET (RST)
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Indicates the sender's intention to
immediately abort the existing connection.
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PUSH (PSH)
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Signals the immediate push of data
from the sending host to the receiving host. For interactive applications
such as telnet, the main issue is the quickest response time, which this
"push" flag signals.
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URGENT (URG)
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Urgent data should take precedence
over other data. For example, a Ctrl-C to terminate a FTP download.
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