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ProSafe VPN Firewall 200 FVX538 Reference Manual
Network Planning for Dual WAN Ports
B-5
v1.0, March 2009
Internet Connection Information Form
Print this page. Fill in the configuration parameters from your Internet Service Provider (ISP).
ISP Login Name:
The login name and password are case sensitive and must be entered exactly as
given by your ISP. For AOL customers, the login name is their primary screen name. Some ISPs
use your full e-mail address as the login name. The Service Name is not required by all ISPs. If
you connect using a login name and password, then fill in the following:
Login Name: ______________________________
Password: ____________________________
Service Name: _____________________________
Fixed or Static IP Address:
If you have a static IP address, record the following information. For
example, 169.254.141.148 could be a valid IP address.
Fixed or Static Internet IP Address: ______
.______
.______
.______
Gateway IP Address: ______
.______
.______
.______
Subnet Mask: ______
.______
.______
.______
ISP DNS Server Addresses:
If you were given DNS server addresses, fill in the following:
Primary DNS Server IP Address: ______
.______
.______
.______
Secondary DNS Server IP Address: ______
.______
.______
.______
Host and Domain Names:
Some ISPs use a specific host or domain name like
CCA7324-A
or
home
. If you haven’t been given host or domain names, you can use the following examples as a
guide:
•
If your main e-mail account with your ISP is
, then use
aaa
as your host
name. Your ISP might call this your account, user, host, computer, or system name.
•
If your ISP’s mail server is
mail.xxx.yyy.com
, then use
xxx.yyy.com
as the domain
name.
ISP Host Name: _________________________
ISP Domain Name: _______________________
Fully Qualified Domain Name:
Some organizations use a fully qualified domain name (FQDN)
from a dynamic DNS service provider for their IP addresses.
Dynamic DSN Service Provider: ______________________
FQDN: _______________________
Page 192 / 240
ProSafe VPN Firewall 200 FVX538 Reference Manual
B-6
Network Planning for Dual WAN Ports
v1.0, March 2009
Overview of the Planning Process
The areas that require planning when using a firewall that has dual WAN ports include:
•
Inbound traffic (e.g., port forwarding, port triggering, DMZ port)
•
Virtual private networks (VPNs)
The two WAN ports can be configured on a mutually-exclusive basis to either:
•
Rollover for increased reliability, or
•
Balance the load for outgoing traffic.
These two categories of considerations interact to make the planning process more challenging.
Inbound Traffic
Unrequested incoming traffic can be directed to a PC on your LAN rather than being discarded.
The mechanism for making the IP address public depends on whether the dual WAN ports are
configured to either roll over or balance the loads.
Virtual Private Networks (VPNs)
A virtual private network (VPN) tunnel provides a secure communication channel between either
two gateway VPN firewalls or between a remote PC client and gateway VPN firewall. As a result,
the IP address of at least one of the tunnel end points must be known in advance in order for the
other tunnel end point to establish (or re-establish) the VPN tunnel.
Note:
Once the gateway firewall WAN port rolls over, the VPN tunnel collapses and must
be re-established using the new WAN IP address.
Page 193 / 240
ProSafe VPN Firewall 200 FVX538 Reference Manual
Network Planning for Dual WAN Ports
B-7
v1.0, March 2009
The Roll-over Case for Firewalls With Dual WAN Ports
Rollover for the dual WAN port case is different from the single gateway WAN port case when
specifying the IP address. Only one WAN port is active at a time and when it rolls over, the IP
address of the active WAN port always changes. Hence, the use of a fully-qualified domain name
is always required, even when the IP address of each WAN port is fixed.
Features such as multiple exposed hosts are not supported when using dual WAN port rollover
because the IP addresses of each WAN port must be in the identical range of fixed addresses.
The Load Balancing Case for Firewalls With Dual WAN Ports
Load balancing for the dual WAN port case is similar to the single WAN port case when specifying
the IP address. Each IP address is either fixed or dynamic based on the ISP: fully-qualified domain
names must be used when the IP address is dynamic and are optional when the IP address is static.
Figure B-2
Figure B-3
Page 194 / 240
ProSafe VPN Firewall 200 FVX538 Reference Manual
B-8
Network Planning for Dual WAN Ports
v1.0, March 2009
Inbound Traffic
Incoming traffic from the Internet is normally discarded by the firewall unless the traffic is a
response to one of your local computers or a service that you have configured in the Inbound Rules
menu. Instead of discarding this traffic, you can have it forwarded to one or more LAN hosts on
your network.
The addressing of the firewall’s dual WAN port depends on the configuration being implemented:
Inbound Traffic to Single WAN Port (Reference Case)
The Internet IP address of the firewall’s WAN port must be known to the public so that the public
can send incoming traffic to the exposed host when this feature is supported and enabled.
In the single WAN case, the WAN’s Internet address is either fixed IP or a fully-qualified domain
name if the IP address is dynamic.
Inbound Traffic to Dual WAN Port Systems
The IP address range of the firewall’s WAN port must be both fixed and public so that the public
can send incoming traffic to the multiple exposed hosts when this feature is supported and enabled.
Table B-1. IP addressing requirements for exposed hosts in dual WAN port systems
Configuration and
WAN IP address
Single WAN Port
(reference case)
Dual WAN Port Cases
Rollover
Load Balancing
Inbound traffic
•
Port forwarding
•
Port triggering
•
DMZ port
Fixed
Allowed
(FQDN optional)
FQDN required
Allowed
(FQDN optional)
Dynamic
FQDN required
FQDN required
FQDN required
Figure B-4
Page 195 / 240
ProSafe VPN Firewall 200 FVX538 Reference Manual
Network Planning for Dual WAN Ports
B-9
v1.0, March 2009
Inbound Traffic: Dual WAN Ports for Improved Reliability
In the dual WAN port case with rollover, the WAN’s IP address will always change at rollover. A
fully-qualified domain name must be used that toggles between the IP addresses of the WAN ports
(i.e., WAN1 or WAN2).
Inbound Traffic: Dual WAN Ports for Load Balancing
In the dual WAN port case for load balancing, the Internet address of each WAN port is either
fixed if the IP address is fixed or a fully-qualified domain name if the IP address is dynamic.
Figure B-5
Note:
Load balancing is implemented for outgoing traffic and not for incoming traffic.
Consider making one of the WAN port Internet addresses public and keeping the
other one private in order to maintain better control of WAN port traffic.
Figure B-6

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