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ProSafe Dual WAN Gigabit Firewall with SSL & IPsec VPN FVS336G Reference Manual
2-20 Connecting the FVS336G to the Internet
v1.2, June 2008
2. Click the Advanced link to the right of the tabs. The WAN1 Advanced Options tab is
displayed (along with the WAN2 Advanced Options tab).
3. Edit the default information you want to change.
a. MTU Size. The normal MTU (Maximum Transmit Unit) value for most Ethernet
networks is 1500 Bytes, or 1492 Bytes for PPPoE connections. For some ISPs, you may
need to reduce the MTU. This is rarely required, and should not be done unless you are
sure it is necessary for your ISP connection.
b. Port Speed. In most cases, your VPN firewall can automatically determine the connection
speed of the WAN port. If you cannot establish an Internet connection and the WAN Link
or Speed LED blinks continuously, you may need to manually select the port speed.
AutoSense is the default.
If you know the Ethernet port speed that your broadband modem supports, select it;
otherwise, select 10M. Use the half-duplex settings unless you are sure your broadband
modem supports full duplex.
c. Router's MAC Address. Each computer or router on your network has a unique 32-bit
local Ethernet address. This is also referred to as the computer's MAC (Media Access
Control) address. The default is Use default address. However, if your ISP requires MAC
authentication, then select either of these options:
• Use this Computer's MAC address to have the VPN firewall use the MAC address of
the computer you are now using, or
• Use This MAC Address to manually type in the MAC address that your ISP expects.
Figure 2-15