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Some environments require the Security option in every packet; such a requirement is outside the scope of this document and the IP standard specification. Note, however, that the security options described in [INTERNET:1] and [INTERNET:16] are obsolete. Routers SHOULD IMPLEMENT the revised security option described in [INTERNET:5].


Routers intended for use in networks with multiple security levels should support packet filtering based on IPSO (RFC-1108) labels. To implement this support, the router would need to permit the router administrator to configure both a lower sensitivity limit (e.g. Unclassified) and an upper sensitivity limit (e.g. Secret) on each interface. It is commonly but not always the case that the two limits are the same (e.g. a single-level interface). Packets caught by an IPSO filter as being out of range should be silently dropped and a counter should note the number of packets dropped because of out of range IPSO labels.

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Connected: An Internet Encyclopedia Security Option


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