Quick Reference Guide

Table Of Contents
Chapter 3: LAN Configuration | 31
ProSafe Dual WAN Gigabit Firewall with SSL & IPsec VPN FVS336Gv2 Reference Manual
between 192.168.1.2 and 192.168.1.100, although you may wish to save part of the range for
devices with fixed addresses.
The network storage will deliver the following parameters to any LAN device that requests
DHCP:
An IP address from the range you have defined.
Subnet mask.
Gateway IP address (the network storage’s LAN IP address).
Primary DNS server (the network storage’s LAN IP address).
WINS server (if you entered a WINS server address on the DHCP section of the LAN
Setup screen).
Lease time (date obtained and duration of lease).
DHCP Relay options allow you to make the network storage a dhcp relay agent. The DHCP
Relay Agent makes it possible for DHCP broadcast messages to be sent over routers that do
not support forwarding of these types of messages. The DHCP Relay Agent is therefore the
routing protocol that enables DHCP clients to obtain IP addresses from a DHCP server on a
remote subnet, or which is not located on the local subnet. If you have no configured DHCP
Relay Agent, your clients would only be able to obtain IP addresses from the DHCP server
which is on the same subnet. To enable clients to obtain IP addresses from a DHCP server
on a remote subnet, you have to configure the DHCP Relay Agent on the subnet that
contains the remote clients, so that it can relay DHCP broadcast messages to your DHCP
server.
When the DNS Proxy option is enabled, the network storage will act as a proxy for all DNS
requests and communicate with the ISP’s DNS servers (as configured in the WAN settings
screen). All DHCP clients will receive the Primary/Secondary DNS IP along with the IP
address where the DNS Proxy is running, that is, the network storage’s LAN IP address.
When disabled, all DHCP clients will receive the DNS IP addresses of the ISP excluding the
DNS Proxy IP address. The feature is particularly useful in Auto Rollover mode. For example,
if the DNS servers for each connection are different, then a link failure may render the DNS
servers inaccessible. However, when the DNS proxy is enabled, then clients can make
requests to the network storage and the network storage, in turn, sends those requests to the
DNS servers of the active connection.
Configuring the LAN Setup Options
The LAN Setup screen allows configuration of LAN IP services such as DHCP and allows you to
configure a secondary or “multi-home” LAN IP setup in the LAN. The default values are suitable
for most users and situations. Disable the DNS Proxy if you are using a dual WAN configuration
with route diversity and failover. These are advanced settings most usually configured by a
network administrator.