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Section 3
General
BreakW
ater Basic Firewall
BreakWater delivers an easily selectable set of pre-configured firewall pro-
tection levels. These settings are readily available for simple implementa-
tion through Cayman’s embedded web server interface.
BreakWater provides you and your network with:
Protection for all LAN users.
Elimination of firewall management software on individual PC’s.
Immediate protection through three pre-configured firewall levels.
Elimination of the complexity associated with developing firewall rules.
BreakWater Settings
BreakWater Basic Firewall’s
three
settings are:
ClearSailing
ClearSailing provides protection against network initiated inbound traffic,
while securely passing outbound traffic through the Gateway. In conjunc-
tion with Network Address Translation, this setting allows authorized
remote diagnostic support while protecting against undesired inbound
traffic.
SilentRunning
Using this level of firewall protection allows secure transmission of out-
bound traffic, but disables any attempt for inbound traffic to identify the
Gateway. This is the Internet equivalent of having an unlisted number.
LANdLocked
The third option available turns off all inbound and outbound traffic, isolat-
ing the LAN and disabling all WAN traffic.
See
page 69
for
How To Configure BreakWater
instructions includ-
ing a table of user tips.
BreakWater Basic Firewall operates independent of the Gateway’s NAT
functionality.
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27
Section 3
General
VPN IPSec Pass Through
This Cayman service supports your independent VPN client software in a
transparent manner. Cayman has implemented an Application Layer Gate-
way (ALG) to support multiple PCs running IP Security protocols.
This feature has three elements:
1.
On power up or reset, the address mapping function (NAT) of the Gateway’s
WAN configuration is turned on by default.
2.
When you use your third-party VPN application, the Gateway recognizes the
traffic from your client and your unit. It allows the packets to pass through the
NAT “protection layer” via the encrypted IPSec tunnel.
3.
The encrypted IPSec tunnel is established “through” the Gateway.
A typical VPN IPSec Tunnel pass through is diagrammed below:
Typically, no special configuration is necessary to use the IPSec pass
through feature. This feature may need to be disabled for special VPN
clients that are designed to be supported through NAT.
In the diagram, VPN PC clients are shown behind the Cayman Gate-
way and the secure server is at Corporate Headquarters across the
WAN. You cannot have your secure server behind the Cayman Gate-
way.
When multiple PCs are starting IPSec sessions, they must be started
one at atime to allow the associations to be created and mapped.
Cayman
Gateway
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28
Section 3
General
SafeHarbour VPN IPSec T
unnel
SafeHarbour VPN IPSec Tunnel provides a single, encrypted tunnel to be
terminated on the Gateway, making a secure tunnel available for all LAN-
connected Users. This implementation offers the following:
Eliminates the need for VPN client software on individual PC’s.
Reduces the complexity of tunnel configuration.
Simplifies the ongoing maintenance for secure remote access.
A VPN tunnel is a secure link between two networks interconnected over
an IP network providing a secure, cost-effective alternative to dedicated
leased lines.
SafeHarbour employs VPN standards, including:
Internet Protocol Security
(IPSec) suite, a series of protocols including
encryption, authentication, integrity, and replay protection.
Internet Key Exchange
(IKE), a management protocol of IPSec.
Adherence to VPN standards allows seamless interoperability between a
Cayman Gateway and another standards-based encryptor. SafeHarbour
supports:
Symmetric encryption protocols DES, 3DES, Blowfish, and CAST
Hash algorithms MD5 and SHA1
Diffie-Hellman groups 1, 2, and 5.
Terms are defined in the
Glossary
and
How To
sections.
An important feature of the SafeHarbour VPN IPSec Tunnel is secure
encryption of the configured circuit in
both
directions.
“HQNetOne”
“RemoteNetTwo”
Encrypted IPSec Tunnel
Tunnel Terminates
at Cayman Gateway
Tunnel Terminates
at Standards-based Gateway
IP Network
SafeHarbour VPN IPSec Tunnel Termination
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29
Section 4
Access the User Interface
Access the User Interface
Using the embedded Web-based user interface for the Netopia Cayman-
series Gateway you can configure, troubleshoot, and monitor the status of
your Gateway. For COS Version 6.3 the Web-based UI has been modified:
To accomodate multiple new features of COS 6.3.
To make using the entire facility easier.
Open the Web Connection
Once your Gateway is powered up, you can use any recent version of the
best-known web browsers that support javascript and Cascading Style
Sheets from any LAN-attached PC or workstation.
The procedure is:
Step 1
Enter the name or IP address of your Cayman Gateway in the Web browser's
window and click
Enter
.
For example, you would enter
if your Cayman Gateway is
using its default IP address. You can enter
http://cayman-2e.
(including the final
period) or
http://cayman-dsl.
if your computer has been configured to obtain its
network configuration from a DHCP server.
Step 2
If an administrator or user password has been assigned to the Cayman
Gateway, enter
Admin
or
User
as the username and the appropriate
password and click
OK
.
The Cayman Gateway Home page opens.
W
eb-based User Interface
Section 4
If the Gateway is not configured, after logon you will see the Quickstart page.
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30
Section 4
Home page
Home page
The Home page is the “dashboard” for your Cayman Gateway. The toolbar
at the top provides links to controlling, configuring, and monitoring pages.
Critical configuration and operational status is displayed in the center sec-
tion. If you log on as Admin you see this page.
This example screen is from the Dual Ethernet Gateway.
The Home page differs slightly between DSL and Dual Ethernet Gateways.
Home page - User Mode, DSL Gateway
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