AXIS 211M - System Options29System OptionsSecurityUser access control is enabled by default, when the administrator sets the root password on first access. Anadministrator can set up other users, by giving them user names and passwords. It is also possible to allowanonymous viewer login, which means that anybody may access the Live View page, as described below:Users - the user list displays the authorized users and user groups (levels):User Settings - check the relevant check boxes to enable:• Anonymous viewer login - allows any viewer direct access to the Live View page.• Maximum number of simultaneous viewers - enter a value here to restrict the number of unicast viewersaccessing the unit. This is useful if you need to save on bandwidth. (Note that all multicast viewers count as1 viewer.)The AXIS 211M Network Camera supports different methods of user authentication:HTTP Basic Authentication - This authenticates the user by requesting a user name and a password. Theexchange of network credentials is in simple base64 coding and is not encrypted.HTTP Digest Authentication - This method also requests a user name and password, but the exchange ofcredentials is encrypted, which secures it against eavesdropping.IP Address FilteringChecking the Enable IP address filtering box enables the IP address filtering function, whereby the IP addressesin the list of filtered addresses will be allowed or denied access to the AXIS 211M.Up to 256 IP address entries may be specified (a single entry can contain multiple IP addresses). All other IPaddresses not in this list will be allowed or denied access accordingly, i.e. if the addresses in the list are allowed,then all others are denied access, and vice versa. Click the Add button to add new filtered addresses. See also theonline help for more information.Referrals - To prevent unauthorized clients from including the video stream from the cameras into external Webpages, check the Referrals checkbox and enter the IP address or Host name of the computer that hosts the Webpages with the included video stream. Several IP addresses/host names can be defined and are separated bysemicolons (;). This option is only applicable to Motion JPEG video streams.Notes: If the referrals feature is enabled and you wish to also allow normal access to the Live View page, the product's own IP address or hostname must be added to the list of allowed referrers.Restricting referrers has no effect on an MPEG-4 video stream. To restrict an MPEG-4 stream, IP address filtering must be enabled.Restricting referrers is of greatest value when not using IP address filtering. If IP address filtering is used, then the allowed referrersare automatically restricted to those allowed IP addresses.Viewer Provides the lowest level of access, which only allows access to the Live View page.Operator An operator can view the Live View page, create and modify event types and adjust certainother settings. Operators have no access to the System Options.Administrator An administrator has unrestricted access to all the setup tools and can determine theregistration of all other users.