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The URG flag is used to indicate that there is urgent data in the TCP stream, and that the data should be delivered with high priority. Since handling of the URG flag is inconsistent between different operating systems, an attacker can use the URG flag to conceal certain attacks.
You can configure how the URG flag should be handled.
Flags Fields
In this field… |
Do this… |
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URG Flag |
Specify whether to clear or allow the URG flag, by selecting one of the following:
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