Page 51 / 72 Scroll up to view Page 46 - 50
Configuring Your Gateway
3. Complete the fields in fields Trigger menu (see Table 14). (Or click
Back
to return to the
Trigger menu or
Cancel
to cancel any selections you made.)
4. Click
Apply
. The Special Application menu reappears, with the trigger you configured
shown in the
Trigger Table
.
5. To configure additional triggers (up to 20), repeat steps 1 through 4. When you finish, click
Apply
in the Special Applications menu to save your settings.
6. To change the settings for a trigger, click the radio button to the left of the trigger you want
to change and click the
Edit
button. When the Trigger menu appears, edit the settings as
necessary (see Table 14) and click
Apply
. Click
Apply
in the Trigger menu to save your
settings.
7. To delete a trigger, click the radio button to the left of the trigger you want to delete and
click the
Delete
button. No precautionary message appears before you delete a trigger.
Click
Apply
in the Trigger menu to save your settings.
Figure 30. Trigger Menu
51
SMCD3GN Wireless Cable Modem Gateway User Manual
Downloaded from
www.Manualslib.com
manuals search engine
Page 52 / 72
Configuring Your Gateway
Table 14. Trigger Menu Options
Option
Description
Name
Name for identifying the trigger. The name is for reference purposes only.
Type
The type of protocol you want to use with the trigger. Choices are TCP and UDP. Default is
TCP. For example, to track the H.323 protocol, the protocol type should be TCP.
Trigger Port
From and To port ranges of the special application. For example, to track H.323 protocol, the
From and To ports should be 1720.
Target Port
From and To port ranges for the target port listening for the special application.
Interval
Specify the interval between 50 and 30000 between two continuous sessions. If the interval
exceeds this time interval setting, the sessions are considered to be unrelated.
IP Replacement
Select the IP replacement according to the application. Some applications embed the source
host's IP in the datagram and normal NAT would not translate the IP address in the datagram.
To make sure the network address translation is complete, IP replacement is necessary for
these special applications, such as H.323.
Allow sessions initiated from/to the
3
rd
host
Decide whether the sessions can start from/to a third host. To prevent hacker attacks from a
3rd host, this feature usually is not allowed. However, for some special applications, such as
MGCP in a VOIP application, a session initiated from a third host is permitted. For example,
assume Client A is trying to make a phone call to a host B. Client A tries to communicate with
the Media Gateway Controller (MGC) first and provides host B's number to the MGC. Then
MGC checks its own database to find B and communicate with B to provide B the information
about A. B uses this information to communicate directly to A. So initially, A is talking to MGC,
but the final step has B initiating a session to A. If the 3rd-host-initiated session is not allowed
in this example, the whole communication fails.
Configuring URL Blocking
Using the URL Blocking menu, you can configure your Gateway to block access to certain
Web sites from local computers by entering either a full URL address or keywords of the
Web site. Your Gateway examines all the HTTP packets to block the access to those
particular sites. This feature can be used to protect children from accessing inappropriate
Web sites. You can block up to 50 sites.
Using URL blocking, you can also make up to 10 computers exempt from URL blocking and
have full access to all Web sites at any time.
To display the URL Blocking menu, click
Firewall
in the menu bar and then click the
URL
Blocking
submenu. Figure 31 shows an example of the menu.
Note:
The Gateway provides a Schedule Rules feature that lets you configure URL blocking
for certain days, if desired. For more information, see “Configuring Schedule Rules” on page
54.
52
SMCD3GN Wireless Cable Modem Gateway User Manual
Downloaded from
www.Manualslib.com
manuals search engine
Page 53 / 72
Configuring Your Gateway
Figure 31. URL Blocking Menu
To enable URL blocking:
1. In the URL Blocking menu, check
Enable Keyword Blocking
.
2. To exempt a computer from URL blocking, enter the computer’s Media Access Channel
(MAC) address in the
Add exempted PC
field and click the
Add Trusted Host
button. The
Exempted PC List
shows the MAC address you entered. Repeat this step for each
additional computer (up to 10) you want to make exempt from URL blocking. To remove a
computer from being exempted, use the
Delete
or
Delete All
buttons next to the field to
delete selected or all MAC addresses in the field.
3. To block a site, enter in the
Type new Keyword/Domain here
field a keyword or domain
name of the site you want to block and click
Add Keyword
. The
Blocked
Keyword/Domain List
shows the keyword or domain you entered. Repeat this step for
each additional keyword or domain (up to 50) you want to make exempt from URL
53
SMCD3GN Wireless Cable Modem Gateway User Manual
Downloaded from
www.Manualslib.com
manuals search engine
Page 54 / 72
Configuring Your Gateway
blocking. To remove a computer from being exempted, use the
Delete
or
Delete All
buttons next to the field to delete selected or all MAC addresses in the field.
4. Click
Apply
.
Configuring Schedule Rules
Schedule rules work with the Gateway’s URL blocking feature (described on page 52) to tell
the Gateway when to perform URL blocking.
To access the Schedule Rule menu, click
Firewall
in the menu bar and then click the
Schedule Rule
submenu in the menu bar. Figure 32 shows an example of the menu.
Figure 32. Schedule Rule Menu
To configure a schedule rule:
1. In the Schedule Rule menu, check the days when you want to use URL blocking.
2. Specify the time when URL blocking is to start in the
Start Time
fields and the time when it
is to end in the
End Time
field. Or to enable URL blocking all day, check
All Day
.
3. Click
Apply
.
54
SMCD3GN Wireless Cable Modem Gateway User Manual
Downloaded from
www.Manualslib.com
manuals search engine
Page 55 / 72
Configuring Your Gateway
Configuring Email and Syslog Alerts
Your Gateway inspects packets at the application layer, and stores TCP and UDP session
information, including timeouts and number of active sessions. This information Is helpful
when detecting and preventing Denial of Service (DoS) and other network attacks.
If you enabled the Gateway’s firewall or content-filtering feature, you can use the
Email/Syslog Alert menu to configure the Gateway to send email notifications or add entries
to the syslog when:
y
Traffic is blocked
y
Attempts are made to intrude onto the network
y
Local computers try to access block URLs
You can configure the Gateway to generate email notifications or syslog entries immediately
or at a preconfigured time.
To access the Email/Syslog Alert menu, click
Firewall
in the menu bar and then click the
Email/Syslog Alert
submenu in the menu bar. Figure 33 shows an example of the menu.
The menu has three sections:
y
The top area lets you configure the Gateway to send email notifications.
y
The middle area lets you configure the to add syslog entries.
y
The bottom area lets you define the alerting schedule.
55
SMCD3GN Wireless Cable Modem Gateway User Manual
Downloaded from
www.Manualslib.com
manuals search engine

Rate

3.5 / 5 based on 2 votes.

Bookmark Our Site

Press Ctrl + D to add this site to your favorites!

Share
Top