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Page 56 / 126 Scroll up to view Page 51 - 55
030-300613 Rev A
56
August 2009
User Guide
VersaLink Wireless Gateway (Model 7500)
13.
SECURITY
This section explains the security features of your Gateway and guides you through the configurable settings.
13.1
Security Level
The following screen will appear if you select
Security > Security Level
from the main menu. This screen allows
you to change your firewall security levels by selecting from the available options. If you change the settings in this
screen, click
save
and then
OK
. If you click
Cancel
, the screen will return to its previous settings.
IMPORTANT
: It is recommended that you do not change the settings in the
Custom Rules
screen. If you need to
reset your Gateway to factory default settings, push the reset button on the top of Gateway.
Security Level
Select these options to control outbound traffic initiated within the local network. By
default, the Security Level is set to None. Note: Only the most advanced users should
select the
Custom
option.
•
High: Select this option to allow only basic Internet functionality. Only
Mail, News, Web, FTP, and IPSEC are allowed. All other traffic is
prohibited.
•
Medium: Select this option to allow only basic Internet functionality by
default; however, Medium security allows customization through NAT
configuration so that you can enable the traffic that you want to pass.
•
Low: Select this option to allow all traffic except for known attacks. With
Low security, your Gateway is visible to other computers on the Internet.
•
None: Select this option to disable security and allow all traffic. (All traffic
is passed.)
•
Custom: Select this option to edit the firewall configuration directly. When
Custom is selected, the
edit
button will be clickable. Clicking
edit
will open
the
Custom Rules
screen, which allows for user customization of Gateway
security settings.
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August 2009
User Guide
VersaLink Wireless Gateway (Model 7500)
Remote Logging
Note: The syslog server must be configured to listen on udp port 514, which is usually the default port. In order
for the logs to be saved to the syslog server, the server should be configured to save the logs to a file. Some of the
free syslog servers available on the Internet are kiwisyslog, MT_syslog and 3Csyslog.
Enable
Click this check box to enable the Gateway to send firewall logs to a syslog server.
By default, remote logging is disabled (unchecked).
Remote IP Address
Displays the IP address of the syslog server machine to which the diagnostics logs to
be sent.
13.1.1
Custom Rules
The following screen will appear if you select
Custom
and then
OK
from the
Security Level
screen and click the
edit
button (
Security > Security Level > Custom Rules
).
The
Custom Rules
screen allows you to configure the
security parameters on your Inbound and Outbound traffic. Inbound rules will restrict inbound traffic from the WAN
to the LAN. Outbound rules will restrict outbound traffic from the LAN to WAN. If you change the settings in this
screen, click
save
. If you click
cancel
, the screen will return to its previous settings.
IMPORTANT
: Custom security is an advanced configuration option that allows you to edit the firewall
configuration directly. Only expert users should attempt this. It is recommended that you do not change the settings
in this screen. If you need to reset your Gateway to factory default settings, push the reset button on the rear of the
Gateway; or follow the instructions in section 14.2.1, “Backup/Restore,” to restore the Gateway to default settings.
NOTE:
The default security setting is applied if a packet does not match any defines rules. Clicking
Save
allows the
firewall rules to be saved to flash (a temporary storage area in your Gateway).
Page 58 / 126
030-300613 Rev A
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August 2009
User Guide
VersaLink Wireless Gateway (Model 7500)
Security Default
Select the option to allow or deny default action to be taken if no rule is found to
match the given packet.
•
Allow: Allow the packet if no rule matches it.
•
Deny:
Block the packet if no rule matches it.
Rule Name
Displays the name of the new rule.
Type
Select the option to allow or deny the packet matching this rule.
•
Allow: Allow the packet matching this rule.
•
Deny: Block the packet matching this rule.
Protocol
Click this drop-down menu to select the protocol for the new rule: TCP, UDP,
Protocol Number, ICMP Type, or All.
Source Address
Displays the source address of the packet to check the rule against.
Destination Address
Displays the destination address of the packet to check the rule against.
Source Port
Displays the source port of the packet to check the rule against.
Destination Port
Displays the destination port of the packet to check the rule against.
Mode
Click this drop-down menu to specify whether or not packets need to be logged: Log
or No Log.
Direction
Click this drop-down menu to select the traffic direction for which the rule is applied:
Inbound, Outbound, or Both.
13.2
Security Services
This section discusses the
Security Services
screens (ALG, Port Forwarding, and Port Triggering) of your Gateway
and guides you through the configurable settings.
Page 59 / 126
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August 2009
User Guide
VersaLink Wireless Gateway (Model 7500)
13.2.1
ALG
The following screen will appear if you select
Security > Services > ALG
from the main menu. This screen enables
you to configure application-layer gateway (ALG) services for your Gateway by clicking on the check box of each
service that you want to enable (a check mark will appear in the box). If you change the settings in this screen, click
apply
and then
OK
. If you click
Cancel
, the screen will return to its previous settings.
Enabling an ALG service opens the IP ports associated with the corresponding service. For example, if you have an
IPSec client running on a LAN-side PC attached to the Gateway, it is necessary to enable the IPSec ALG. Enabling
IPSec opens the default ports used by IPSec, 500 and 1500, so that traffic to and from the IPSec client may pass
through.
NOTE:
When the firewall level is set to “High,” some services may not be configurable.
FTP
Click this check box to enable the FTP ALG.
H323
Click this check box to enable the H323 ALG.
TFTP
Click this check box to enable the TFTP ALG.
PPTP
Click this check box to enable the PPTP ALG.
IPSec
Click this check box to enable the IPSec ALG.
SIP
Click this check box to enable the SIP ALG.
Page 60 / 126
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User Guide
VersaLink Wireless Gateway (Model 7500)
13.2.2
Port Forwarding
The following screen will appear if you select
Security > Services > Port Forwarding
from the main menu. This
screen allows you to forward incoming traffic from the outside network to a range of WAN ports on an IP address
on the LAN. You can also enable traffic from a local network (to a specified port range) to be allowed to go outside
of the network in medium firewall settings. Displayed are currently active port forwarding services. You can add
more pre-defined services (or create your own services) by selecting the appropriate entry in the
Service Name
drop-down menu.
Current Profile
Click this drop-down menu to display the NAT (Network Address Translation)
services available. All of the settings on this screen are associated with a Service
Profile. The service profile is selected from the
Current Profile
drop-down menu. If
no profile has been created, the settings chosen are applied to the default profile.
The
Service Profile
drop-down menu located in the
Home > Connection Overview
> Edit
screen (on the
Home
screen, click the
Add/Edit Connection
link) associates a
service profile with one or more of your “Connection Profiles.” This means different
connections can allow different services to be associated with them. Use the
Current
Profile
drop-down menu to select a profile to edit. However the profile will be
activated from the
Home > Connection Overview > Edit
screen.
•
To create a new service profile, click the
new
button.
•
To remove a service profile, click the
delete
button (not available for the
Default profile).
•
To change the name of a service profile, click the
edit
button.

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