Secure Computing SG300 User Manual page 41

Check DHCP assigned. Anything in the IP Address and Subnet Mask fields is ignored.
Click Update.
Click Start -> (Settings ->) Control Panel and double click Network Connections.
Right click on Local Area Connection (or appropriate network connection for the newly
installed PCI appliance) and select Properties.
Select Internet Protocol (TCP/IP) and click Properties and click Properties.
Check Obtain an IP address automatically, check Obtain DNS server address
automatically and click OK.
Attach your SG unit's Ethernet port to your LAN's hub or switch.
Quick setup is now complete.
Manual configuration
Ensure you have two free IP addresses that are part of the subnet range of your LAN,
and ensure you know your LAN's subnet mask, and the DNS server address and
gateway address used by PCs on your LAN.
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Getting Started