Quick Reference Guide

ProSafe Wireless-N VPN Firewall SRXN3205 Reference Manual
10-12 Monitoring System Performance
v1.0, January 2010
2. Click the LAN Groups tab. The LAN Groups screen is displayed.
The Known PCs and Devices table on the 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 (LAN Setup 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 in the Add
Known PCs and Devices section. Then click add to manually add the device to the database.
For each computer or device, the following fields are displayed in the Known PCs and Devices
table:
• Name. The name of the PC or device. For computers that do not support the NetBIOS
protocol, this will be listed as “Unknown” (you can edit the entry manually to add a
meaningful name). If the computer was assigned an IP address by the DHCP server, then the
Name will be appended by an asterisk.
Figure 10-8