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security
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... situations but unnecessary for the most common communications. The
options include provisions for timestamps, security, and special
routing.
...
... implementation.
In some environments the security option may be required in all
datagrams.
...
... 0 1 - No Operation. This option occupies only 1
octet; it has no length octet.
0 2 11 Security. Used to carry Security,
Compartmentation, User Group ...
... octet; it has no length octet.
0 2 11 Security. Used to carry Security,
Compartmentation, User Group (TCC), and
...
...
This option provides a way for hosts to send security,
compartmentation, handling restrictions, and TCC (closed user
group) parameters. The format for this option is as follows:
...
... 16 bits
Specifies one of 16 levels of security (eight of which are
reserved for future use).
...
... alphanumeric digraphs and are defined in the Defense
Intelligence Agency Manual DIAM 65-19, "Standard Security
Markings".
...
... Every internet module must be able to act on every option. The
Security Option is required if classified, restricted, or
compartmented traffic is to be passed.
...
... Note that the precedence is included in the TOS and the
security/compartment is passed as an option.
RECV (BufPTR, prot, => result, src, dst, TOS ...