if ( this.isPrimary ) {
            this.isPrimary = false;

            // primarySetupOffset
            // SMB_COM_TRANSACTION: 61 = 32 SMB header + 1 (word count) + 28 (fixed words)
            // SMB_COM_NT_TRANSACTION: 69 = 32 SMB header + 1 (word count) + 38 (fixed words)
            this.parameterOffset = this.primarySetupOffset;

            // 2* setupCount
            this.parameterOffset += this.setupCount * 2;