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Configuring Firewall Security Enhancements
83
HomePortal 3801HGV Gateway User Guide
Configuring Firewall Settings
Configuring Firewall Security Enhancements
Objective
To configure firewall security enhancements. This allows you to configure the firewall rules to allow
traffic on the UDP and TCP ports.
Steps
1.
Navigate to
Settings
>
Firewall
>
Advanced Configuration
. The
Advanced configuration
page to configure the security enchancements appears.
2.
Enable or disable stealth mode by selecting or clearing the
Stealth Mode
check box.
When you enable stealth mode, the gateway firewall does not return any information in
response to network queries; that is, it will appear to the intruder that your network does
not exist. This discourages intruders from accessing your network, because it appears as
though there is no active network to access.
3.
Enable or disable the execution of external ping request by selecting or clearing the
Block
Ping
check box.
When you disable
Block Ping
, intruders can use ping to launch an attack against your
network, because ping can determine the IP address of the network (for example,
105.246.172.72) from the domain name (for example, www.mynetwork.com). If you enable
Block Ping
, your network will block all ping requests.
4.
Enable or disable the restricted transmission of packets by selecting or clearing the
Strict
UDP Session Control
check box.
When you enable restricted UDP session, security is enhanced and the gateway does not
accept packets sent from an unknown source over an existing connection.
5.
Enter the duration in seconds in the
UDP Session Timeout
text box. The gateway
terminates the UDP connection request after that duration.
6.
Enter the duration in seconds in the
TCP Session Timeout
text box. The gateway
terminates the TCP connection request after that duration.
7.
Click
Save
. This saves the configuration changes done to firewall security enhancements.
Configuring Application Layer Gateway
Objective
To configure Application Layer Gateway (ALG) on the firewall of the gateway.
Page 92 / 128
Configuring Application Layer Gateway
84
HomePortal 3801HGV Gateway User Guide
Configuring Firewall Settings
If you enable SIP ALG, client applications can use dynamic TCP/ UDP ports to communicate with
the known ports used by the server applications, even though a firewall configuration allows only a
limited number of known ports.
If you disable ALG, the ports get blocked and you have to explicitly open up a large number of ports
in the firewall rendering the network vulnerable to attacks on those ports.
Steps
1.
Navigate to
Settings
>
Firewall
>
Advanced Configuration
. The
Advanced configuration
page to configure the SIP ALG settings appears.
2.
Enable or disable the
SIP ALG
on the gateway firewall by selecting or clearing the check
box.
3.
Click
Save
. This saves the configuration changes.
See Also
Configuring LAN Devices
on page 50
Configuring Broadband Settings
on page 34
Using Diagnostics Features
on page 93
Troubleshooting 3801HGV Gateway
on page 109
Page 93 / 128
85
CHAPTER 11
Viewing Logs
The
Logs
tab displays all types of logs which you can use to diagnose a problem, if any.
This section gives information about the following tabs:
•
Event Log
•
System Log
•
Upgrade Log
•
Firewall Log
Viewing Event Log
Objective:
To view event logs.
You can perform the following tasks on this page:
•
View all event logs
•
Assign a filter to view specific event logs
•
Clear logs from the display list
Viewing All Event Logs
Steps:
To view all event logs, navigate to
Settings>Logs>Event Logs
. The following page appears.
Page 94 / 128
Viewing Event Log
86
HomePortal 3801HGV Gateway User Guide
Viewing Logs
You can see all the event logs on this page.
Note
Make sure that the option
all
is selected in the
Display Filter
list.
The following table displays information about the logs that you can view on the
Event Logs
page.
Name
Description
Type
The type of event. Given below is a list of event types:
• ALM: Alarms
• DBG: Debug
• EMR: Emergency
• ERR: Error
• FLT: Faults
• INF: Information
• NTC: Notice
• WRN: Warning
Date/Time
The date and time when the event occurs, with the latest date on the top.
Event Decription
Source and destination IP addresses with their ports, and a brief description
of the event.
Page 95 / 128
Viewing System Log
87
HomePortal 3801HGV Gateway User Guide
Viewing Logs
Filtering Logs
Steps
To filter logs:
1.
On the
Event Logs
page, select an option in the
Display Filter
drop-down list box.
2.
Click
Submit
to view logs pertaining to the option that you selected.
You can clear logs on the
Event Log
page and minimize the clutter from previous events when you
try to diagnose a problem.
Clearing Event Logs
To clear all logs from a list, click the
Clear Log
button.
Note
To clear a particular log type, select an option in the
Display Filter
list and then click
Clear
Log
.
Viewing System Log
Objective:
To view system logs.
You can perform the following steps on this page:
•
Filtering and viewing the following types of system logs
•
DBG
: Debug
•
INF
: Information
•
NTC
: Notice
•
WRN
: Warning
•
ERR
: Error
•
FTL
: Faults
•
ALR
: Alarm
•
EMR
: Emergency
•
Insert mark to distinguish between old logs and new ones while diagnosing a problem
•
Clear logs to minimize the clutter from previous events when you try to diagnose a problem.

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