RFC 3514:The Security Flag in the IPv4 Header
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1. Introduction
...
IPv4
[
RFC791
]
header
. Benign packets have this
bit
set to 0; those that are used for an
attack
...
2. Syntax
...
offset field
is the only unused
bit
in the
IP header
. Accordingly, the selection of the
bit
position is not left to
IANA
...
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