myip.dn42/apache2-config/myip.dn42.conf

<VirtualHost 172.20.0.81:80>
        ServerName myip.dn42
        ServerAlias v4.myip.dn42
        ServerAlias 172.20.0.81

        DocumentRoot /var/www/myip.dn42/
        <Directory /var/www/myip.dn42/>
            Options -Indexes
            AllowOverride None
        </Directory>

        ErrorLog ${APACHE_LOG_DIR}/error-myip.dn42.log

        ServerSignature On
        ServerTokens Major
</VirtualHost>

<VirtualHost [fd42:d42:d42:81::1]:80>
        ServerName myip.dn42
        ServerAlias v6.myip.dn42
        ServerAlias fd42:d42:d42:81::1

        DocumentRoot /var/www/myip.dn42/
        <Directory /var/www/myip.dn42/>
            Options -Indexes
            AllowOverride None
        </Directory>

        ErrorLog ${APACHE_LOG_DIR}/error-myip.dn42.log

        ServerSignature On
        ServerTokens Major
</VirtualHost>