Trusted Extensions data packets include a CIPSO label option. The data packets can be sent over IPv4 or IPv6 networks.
In the standard IPv4 format, the IPv4 header with options is followed by a TCP, UDP, or SCTP header and then the actual data. The Trusted Extensions version of an IPv4 packet uses the CIPSO option in the IP header for the security attributes.
In the standard IPv6 format, an IPv6 header with extensions is followed by a TCP, UDP, or SCTP header and then the actual data. The Trusted Extensions IPv6 packet includes a multilevel security option in the header with extensions.