Netgear FVS336G FVS336G Reference Manual - Page 53

ProSafe Dual WAN Gigabit Firewall with SSL & IPsec VPN FVS336G Reference Manual Managing Groups and Hosts (LAN Groups) The Known PCs and Devices table in the LAN Groups menu contains a list of all known PCs and network devices that are assigned dynamic IP addresses by the VPN firewall, or have been discovered by other means. Collectively, these entries make up the LAN Groups Database. The LAN Groups Database is updated by these methods: • DHCP Client Requests. By default, the DHCP server in this VPN firewall is enabled, and will accept and respond to DHCP client requests from PCs and other network devices. These requests also generate an entry in the LAN Groups Database. Because of this, leaving the DHCP server feature (on the LAN screen) enabled is strongly recommended. • Scanning the Network. The local network is scanned using ARP requests. The ARP scan will detect active devices that are not DHCP clients. However, sometimes the name of the PC or device cannot be accurately determined, and will appear in the database as Unknown. • Manual Entry. You can manually enter information about a network device. Some advantages of the LAN Groups Database are: • Generally, you do not need to enter either IP address or MAC addresses. Instead, you can just select the desired PC or device. • No need to reserve an IP address for a PC in the DHCP server. All IP address assignments made by the DHCP server will be maintained until the PC or device is removed from the database, either by expiry (inactive for a long time) or by you. • No need to use a fixed IP on PCs. Because the address allocated by the DHCP server will never change, you don't need to assign a fixed IP to a PC to ensure it always has the same IP address. • MAC level control over PCs. The LAN Groups Database uses the MAC address to identify each PC or device. So changing a PC's IP address does not affect any restrictions on that PC. • Group and individual control over PCs. - You can assign PCs to Groups and apply restrictions to each Group using the Firewall Rules screen (see "Using Rules to Block or Allow Specific Kinds of Traffic" on page 4-2). - You can also select the Groups to be covered by the Block Sites feature (see "Blocking Internet Sites (Content Filtering)" on page 4-20). - If necessary, you can also create Firewall Rules to apply to a single PC (see "Configuring Source MAC Filtering" on page 4-24). Because the MAC address is used to identify each PC, users cannot avoid these restrictions by changing their IP address. LAN Configuration 3-5 v1.2, June 2008