D-Link DFL-260E User Manual for DFL-260E - Page 69
Accounting and System Shutdowns, 2.3.9. Limitations with NAT, 2.3.10. RADIUS Advanced Settings
View all D-Link DFL-260E manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 69 highlights
2.3.8. Accounting and System Shutdowns Chapter 2. Management and Maintenance Allow on error to determine how this situation is handled. If the Allow on error setting is enabled, an already authenticated user's session will be unaffected. If it is not enabled, any affected user will automatically be logged out even if they have already been authenticated. 2.3.8. Accounting and System Shutdowns In the case that the client for some reason fails to send a RADIUS AccountingRequest STOP packet, the accounting server will never be able to update its user statistics, but will most likely believe that the session is still active. This situation should be avoided. In the case that the NetDefend Firewall administrator issues a shutdown command while authenticated users are still online, the AccountingRequest STOP packet will potentially never be sent. To avoid this, the advanced setting Logout at shutdown allows the administrator to explicitly specify that NetDefendOS must first send a STOP message for any authenticated users to any configured RADIUS servers before commencing with the shutdown. 2.3.9. Limitations with NAT The User Authentication module in NetDefendOS is based on the user's IP address. Problems can therefore occur with users who have the same IP address. This can happen, for example, when several users are behind the same network using NAT to allow network access through a single external IP address. This means that as soon as one user is authenticated, traffic coming through that NAT IP address could be assumed to be coming from that one authenticated user even though it may come from other users on the same network. NetDefendOS RADIUS Accounting will therefore gather statistics for all the users on the network together as though they were one user instead of individuals. 2.3.10. RADIUS Advanced Settings The following advanced settings are available with RADIUS accounting: Allow on error If there is no response from a configured RADIUS accounting server when sending accounting data for a user that has already been authenticated, then enabling this setting means that the user will continue to be logged in. Disabling the setting will mean that the user will be logged out if the RADIUS accounting server cannot be reached even though the user has been previously authenticated. Default: Enabled Logout at shutdown If there is an orderly shutdown of the NetDefend Firewall by the administrator, then NetDefendOS will delay the shutdown until it has sent RADIUS accounting STOP messages to any configured RADIUS server. If this option is not enabled, NetDefendOS will shutdown even though there may be RADIUS accounting sessions that have not been correctly terminated. This could lead to the situation that the RADIUS server will assume users are still logged in even though their sessions have been terminated. Default: Enabled 69