D-Link DES-3052 Product Manual - Page 199

DES-3028 DES-3028P DES-3028G DES-3052 DES-3052P Layer 2 Fast Ethernet Managed Switch Port Security A given ports' (or a range of ports') dynamic MAC address learning can be locked such that the current source MAC addresses entered into the MAC address forwarding table can not be changed once the port lock is enabled. Setting the Admin State pull-down menu to Enabled, and clicking Apply can lock the port. Port Security is a security feature that prevents unauthorized computers (with source MAC addresses) unknown to the Switch prior to locking the port (or ports) from connecting to the Switch's locked ports and gaining access to the network. To view this window, click Security > Port Security. The following parameters can be set: Parameter Description Figure 10- 2. Port Security window From/To A consecutive group of ports may be configured starting with the selected port. Admin State This pull-down menu allows users to enable or disable Port Security (locked MAC address table for the selected ports). Max. Learning Addr. (0-16) The number of MAC addresses that will be in the MAC address-forwarding table for the selected switch and group of ports. Lock Address Mode This pull-down menu allows you to select how the MAC address table locking will be implemented on the Switch, for the selected group of ports. The options are:  Permanent - The locked addresses will not age out after the aging timer expires.  DeleteOnTimeout - The locked addresses will age out after the aging timer expires.  DeleteOnReset - The locked addresses will not age out until the Switch has been reset. Click Apply to implement changes made. 185