Secure Computing SG300 User Manual page 128

The Subnet is the network on which DHCP server is handing out addresses. Free
Addresses displays the number of remaining available IP addresses that can be
distributed. If this value is 0, you may need to increase the number of IP addresses to
hand out.
DHCP Proxy
The DHCP proxy allows the SnapGear unit to forward DHCP requests from the LAN to
an external server for resolution. This allows both static and dynamic addresses to be
given out on the LAN just as running a DHCP server would.
To enable this feature, specify the server which is to receive the forwarded requests in
Relay Host. This server must also be configured to know and accept requests from the
SnapGear unit's LAN. Then check Enable DHCP Relay and click Apply.
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Network Setup