ホスト制限とユーザ認証を併用する

apache2.conf

        <Directory /var/www/>
                AuthType Digest
                AuthName <realm>
                AuthDigestDomain <path>
                AuthUserFile <htdigest>

                Order deny,allow
                Deny from all
                Allow from <ipaddress>

                Require valid-user
                Require ip <ipaddress>
                Satisfy any
        </Directory>