2.2.3 CNAME-IN-ADDL-TKT
This is a new Key Distribution Center (KDC) option that MUST be set in a KRB_TGS_REQ message to request Service for User to Proxy (S4U2proxy) functionality. The kdc-options flags are specified in [RFC4120] section 5.4.1, and the new cname-in-addl-tkt option is defined as the KDC option with bit position 14.
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KDCOptions ::= KerberosFlags -- cname-in-addl-tkt (14)