D-Link DWS-1008 Product Manual - Page 71
Restricting Layer 2 Forwarding Among Clients
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To clear port 4, which uses tag value 11, from VLAN marigold, type the following command: DWS-1008# clear vlan marigold port 4 tag 11 This may disrupt user connectivity. Do you wish to continue? (y/n) [n]y success: change accepted. To completely remove VLAN ecru, type the following command: DWS-1008# clear vlan ecru This may disrupt user connectivity. Do you wish to continue? (y/n) [n]y success: change accepted. Note: You cannot remove the default VLAN (VLAN 1). However, you can add and remove ports.You can also rename the default VLAN, but D-Link recommends against it. Restricting Layer 2 Forwarding Among Clients By default, clients within a VLAN are able to communicate with one another directly at Layer 2. You can enhance network security by restricting Layer 2 forwarding among clients in the same VLAN. When you restrict Layer 2 forwarding in a VLAN, MSS allows Layer 2 forwarding only between a client and a set of MAC addresses, generally the VLAN's default routers. Clients within the VLAN are not permitted to communicate among themselves directly. To communicate with another client, the client must use one of the specified default routers. Note: For networks with IP-only clients, you can restrict client-to-client forwarding using ACLs. To restrict Layer 2 forwarding in a VLAN, use the following command: set security l2-restrict vlan vlan-id [mode {enable | disable}] [permit-mac mac-addr [mac-addr]] You can specify multiple addresses by listing them on the same command line or by entering multiple commands. Restriction of client traffic does not begin until you enable the permitted MAC list. Use the mode enable option with this command. To change a MAC address, use the clear security l2-restrict command to remove it, then use the set security l2-restrict command to add the correct address. clear security l2-restrict vlan vlan-id [permit-mac mac-addr [mac-addr] | all] Note: There can be a slight delay before functions such as pinging between clients become available again after Layer 2 restrictions are lifted. Even though packets are passed immediately once Layer 2 restrictions are gone, it can take 10 seconds or more for upper-layer protocols to update their ARP caches and regain their functionality. D-Link DWS-1008 User Manual 52
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