It can be installed over a previous installation.
Changes since version 2.7:
+ Indefinite and hourly quotas + Combined transfer rates + Configurable penalty for users that cause short packet flood + Configurable penalty for users with large uploads/downloads + User web access to usage reports (added on June 19, 2008) * Redirection/port mapping works with bridging * A number of minor fixed and enhancements * Improved compatibility with Windows Vista/Server 2008.
Combined transfer rates let user share the connection. For example, if a user is given 100 Kb/s combined rate, he/she may utilize up to 100 Kb/s combined downloads and uploads, like 50/50 or 20/80, whatever the proportion can be.
Penalty for short packet flood allows to pad too small network packets to prevent users who have software applications that send many small packets from overfilling the network. This may be useful for wireless networks. Further discussion is available in this thread.
Configurable penalty for large uploads/downloads is a basic form of dynamic bandwidth allocation. This feature allows to penalize users who download or upload large files (or watch youtube ) by reducing their speed automatically once a download hits the specified limit in seconds or megabytes.
Updated on June 13, 2008: A critical issue caused 'division by zero' has been fixed.
Updated on June 14, 2008: Fixed a problem with port mapping/redirection used in bridging mode. Added additional port filter for mapping/redirection (useful for transparent proxying).
Updated on June 19, 2008: Fixed skew stats if short packet penalty was on. Added user web-access to usage reports. In order to use the latter, activate the built-in web-server in options as shown below, and point your web-browser to the localhost. As the user name enter the name of the rule (case sensitive) which you would like to see usage report of and the password is initially blank (can be configured on a per-rule basis). Screenshots below illustrate the changes.
Updated on July 10, 2008: Quotas may now be resetted on 29, 30 or 31 day (there was a limit of 28 days before). Added automatic usage DB cleanup, fixed minor bug with penalty threshold (now it can be less than 100).