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Page 61 / 131 Scroll up to view Page 56 - 60
6381-A4 Router Users Guide
61
SNTP
Simple network timing protocol (SNTP) is a protocol used to synchronize the system time to
public SNTP servers. It uses the UDP protocol on port 123 to communicate between clients and
servers. The 6381 supports SNTP client functionality in compliance with IETF RFC 2030. The
system clock time in the 6381 can be configured to send client requests to the configured SNTP
server addresses periodically.
The main function of the Simple Network Time Protocol (SNTP) is to provide the network with a
precise time based on Internet standards. Enter the information of the SNTP server to which you
will be connecting.
To configure SNTP:
1.
From the navigation bar at the top of the screen click
Advanced
2.
From the left hand navigation pane select
SNTP
.
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6381-A4 Router Users Guide
62
3.
Check
Enable SNTP.
4.
Specify one or more SNTP servers in the
Primary SNTP Server
,
Secondary SNTP Server
,
and
Tertiary SNTP Server
fields and the SNTP options.
Primary SNTP Server
The IP address or the host name of the primary SNTP server. This IP
address can be provided by ISP or user-defined.
Secondary SNTP
Server
The IP address or the host name of the secondary SNTP server. This IP
address can be provided by ISP or user-defined.
Tertiary SNTP Server
The IP address or the host name of the tertiary SNTP server. This IP
address can be provided by ISP or user-defined.
Timeout
If the RG failed to connect to a SNTP server within the Timeout period, it
retries the connection.
Polling Interval
The amount of time between a successful connection with a SNTP server
and a new attempt to connect to an SNTP server.
Retry Count
The number of times the RG tries to connect to an SNTP server before it
tries to connect to the next server in line.
Time Zone
The time zone in which the RG resides.
Day Light
Check/uncheck this option to enable/disable daylight saving time (DST).
Note: DST is not automatically enabled or disabled. You need to manually
enable and disable it.
5.
Click
Apply
The Apply button will temporarily save this connection. To make the change permanent, click
Tools
(at the top of the page) and select
System Commands
. On the
System Commands
page, click
Save All
.
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6381-A4 Router Users Guide
63
Port Forwarding
The port forwarding (or virtual server) feature allows you to direct incoming traffic to specific LAN
hosts based on a protocol port number and protocol. Using the Port Forwarding page, you can
provide local services (for example web hosting) for people on the Internet or play Internet
games. When users send this type of request to your network via the Internet, the modem will
forward those requests to the appropriate PC. Port forwarding can be used with DHCP assigned
addresses but remember that a DHCP address is dynamic (not static). For example, if you were
configuring a NetMeeting server, you would want to assign this server a static IP address so that
the IP address is not reassigned. Also remember that if an Internet user is trying to access an
Internet application, they must use the WAN IP address. The port forwarding will translate the
WAN IP address into a LAN IP address.
NOTE:
To configure a port you must have an existing LAN client with an IP address. You can add
a LAN client on the
LAN Clients
page.
A database of predefined port forwarding rules allows you to apply one or more rules to one or
more members of a defined LAN group. You can view the rules associated with a predefined
category and add the available rules for a given category. You can also create, edit, or delete
your own port forwarding rules.
To configure a service, game, or other application:
1.
From the navigation bar at the top of the screen click
Advanced
2.
From the left hand navigation pane select
Port Forwarding
.
3.
From the
WAN Connection
dropdown select the external connection.
If the desired LAN IP is not available in the LAN IP drop-down menu, you can add it using
the LAN Client page, which is accessed by clicking
New IP
. See LAN Clients on page 72.
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64
Port Forwarding Fields:
WAN Connection
Select the WAN connection to which port forwarding is applied.
Select LAN Group
Select the LAN Group to which port forwarding is applied.
LAN IP
Select the IP address to host the service.
Allow Incoming
Ping
Enabling incoming ping (ICMP) requests on the Port Forwarding page allows
the RG to respond to a ping from the Internet.
DMZ
Demilitarized zone. By setting a PC on your local network as demilitarized
zone (DMZ), you can choose to forward all incoming packets that cannot be
routed to a specific IP address to the PC with the DMZ IP address. This
opens the access to the DMZ host from the Internet. This function is disabled
by default. By enabling DMZ, you add an extra layer of security protection for
hosts behind the firewall.
Custom Port
Forwarding
This link takes you to the
Custom Port Forwarding
page.
Category
Custom and user-defined categories.
Available Rules
Predefined and user-defined IP filtering rules for each category.
Applied Rules
Lists the IP filtering rules you elect to apply for each given category.
4.
Select the available rules for a given category and click
Add
to apply the rule for the
category.
You can view a rule associated with a predefined filter on the
Rule Management
page. You
get to the rule management page by selecting a rule from the list in the
Available Rules
pane, then clicking
View
.
5.
To add a custom application, select the User category, click
New
and fill in the port,
protocols and description for your application.
The
New
,
View
, and
Delete
buttons become available only when the
User
category is
selected. All the custom rules you create fall under the
User
Category.
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65
The Rule Management page populates for you to create new rules. Enter
Rule Name
,
Protocol
,
Port Start
,
Port End
, and
Port Map
fields, and then click
Apply
.
6.
Continue to add rules as they apply from each category.
7.
Click
Apply
The
Apply
button will temporarily save this connection. To make the change permanent,
click
Tools
(at the top of the page) and select
System Commands
. On the
System
Commands
page, click
Save All
.

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