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Page 86 / 209 Scroll up to view Page 81 - 85
Chapter 10 WAN
NBG6817 User’s Guide
86
10.5
NAT
Use this screen to change your NBG6817’s NAT (Network Address Translation) settings. Click
Expert
Mode
>
WAN
>
NAT
.
10.5.1
General Screen
Use this screen to enable NAT, set a default server and configure your NBG6817’s port forwarding
settings to forward incoming service requests to the server(s) on your local network. Click
Expert
Mode > WAN > NAT > General
.
WAN MAC Address
Once the WAN MAC address is successfully configured, the address will be copied to the configuration file. It
will not change unless you change the setting or upload a different configuration file.
Factory default
Select this option to have the WAN interface use the factory assigned default MAC
address. By default, the NBG6817 uses the factory assigned MAC address to identify
itself.
Clone the
computer's MAC
address
Select this option to have the WAN interface use a different MAC address by cloning the
MAC address of another device or computer. Enter the IP address of the device or
computer whose MAC you are cloning.
Set WAN MAC
Address
Select this option to have the WAN interface use a manually specified MAC address.
Enter the MAC address in the fields.
Multicast Setup
Multicast Setup
Select
IGMPv1/v2
to enable multicasting. This applies to traffic routed from the WAN
to the LAN.
Select
None
to disable this feature. This may cause incoming traffic to be dropped or
sent to all connected network devices.
Auto-Subnet Configuration
Enable Auto-IP-
Change Mode
Select this option to have the NBG6817 change its LAN IP address to 10.0.0.1 or
192.168.1.1 accordingly when the NBG6817 gets a dynamic WAN IP address in the
same subnet as the LAN IP address.
Select this option to have the NBG6817 change its LAN IP address to 10.0.0.1 or
192.168.1.1 accordingly when the NBG6817 gets a DNS server IP address in the same
subnet as the LAN IP address.
The NAT, DHCP server and firewall functions on the NBG6817 are still available in this
mode.
Apply
Click
Apply
to save your changes back to the NBG6817.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 21
Network > WAN > Internet Connection: PPTP Encapsulation (continued)
LABEL
DESCRIPTION
Page 87 / 209
Chapter 10 WAN
NBG6817 User’s Guide
87
Figure 57
Expert Mode > WAN > NAT > General
The following table describes the labels in this screen.
Table 22
Expert Mode > WAN > NAT > General
LABEL
DESCRIPTION
General
Network Address
Translation (NAT)
Network Address Translation (NAT) allows the translation of an Internet protocol address
used within one network (for example a private IP address used in a local network) to a
different IP address known within another network (for example a public IP address used
on the Internet).
Select
Enable
to activate NAT. Select
Disable
to turn it off.
Default Server Setup
Default Server
You can decide whether you want to use the default server or specify a server manually.
In addition to the servers for specified services, NAT supports a default server. A default
server receives packets from ports that are not specified in the port forwarding summary
table below.
Select this to use the default server.
Change To Server
Select this and manually enter the server’s IP address.
Port Forwarding (Max Limit : 32)
#
This is the number of an individual port forwarding server entry.
Name
Select a pre-defined service from the drop-down list box. The pre-defined service port
number(s) and protocol will be displayed in the port forwarding summary table.
Otherwise, select
User define
to manually enter the port number/range and select the
Protocol
.
Protocol
Select the transport layer protocol supported by this virtual server. Choices are
TCP
,
UDP
, or
TCP_UDP
.
If you have chosen a pre-defined service in the
Name
field, the protocol will be
configured automatically.
External Port
This shows the port number(s) that identifies the service if you select a pre-defined
service. If you select
User define
in the
Name
field, enter the port number(s) manually.
Server IP Address
Select
User define
to manually enter the inside IP address of the virtual server here.
Internal Port
This shows the port number(s) that identifies the service if you select a pre-defined
service. If you select
User define
in the
Name
field, enter an internal port number
manually or leave the field blank for port range forwarding.
Page 88 / 209
Chapter 10 WAN
NBG6817 User’s Guide
88
10.5.2
Port Trigger Screen
To change your NBG6817’s trigger port settings, click
Expert Mode > WAN > NAT > Port
Trigger
. The screen appears as shown.
Note: Only one LAN computer can use a trigger port (range) at a time.
Figure 58
Expert Mode > WAN > NAT > Port Trigger
The following table describes the labels in this screen.
10.5.3
Passthrough Screen
Add
Click
to add the rule in the port forwarding summary table.
Delete
Click
to remove a rule.
Apply
Click
Apply
to save your changes back to the NBG6817.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 22
Expert Mode > WAN > NAT > General (continued)
LABEL
DESCRIPTION
Table 23
Expert Mode > WAN > NAT > Port Trigger
LABEL
DESCRIPTION
Port Trigger Rules (Max Limit : 32)
#
This is the rule index number (read-only).
Name
Type a unique name (up to 15 characters) for identification purposes. All characters are
permitted - including spaces.
Incoming Port
Incoming is a port (or a range of ports) that a server on the WAN uses when it sends out
a particular service. The NBG6817 forwards the traffic with this port (or range of ports)
to the client computer on the LAN that requested the service.
Type a port number or the starting port number in a range of port numbers.
End Port
Type a port number or the ending port number in a range of port numbers.
Trigger Port
The trigger port is a port (or a range of ports) that causes (or triggers) the NBG6817 to
record the IP address of the LAN computer that sent the traffic to a server on the WAN.
Type a port number or the starting port number in a range of port numbers.
End Port
Type a port number or the ending port number in a range of port numbers.
Add
Click
to add the rule in the port trigger summary table.
Delete
Click
to remove a rule.
Apply
Click
Apply
to save your changes back to the NBG6817.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Page 89 / 209
Chapter 10 WAN
NBG6817 User’s Guide
89
ALG Overview
Application Layer Gateway (ALG) allows the following applications to operate properly through the
NBG6817’s NAT.
•
SIP - Session Initiation Protocol (SIP) - An application-layer protocol that can be used to create
voice and multimedia sessions over Internet.
•
H.323 - A teleconferencing protocol suite that provides audio, data and video conferencing.
•
FTP - File Transfer Protocol - an Internet file transfer service.
•
SNMP - Simple Network Management Protocol - An application-layer protocol that can be used to
exchange management information between network devices.
•
RTSP - Real Time Streaming Protocol - An application-layer protocol that can be used to stop,
pause or play video and audio applications streaming on the Internet.
•
IRC - Internet Relay Chat - An application-layer protocol that can control the relay chat
applications and allow clients to have real-time communications with others on the Internet.
The ALG feature is only needed for traffic that goes through the NBG6817’s NAT.
To change your NBG6817’s ALGs and VPN pass-through settings, click
Expert Mode > WAN >
NAT > Passthrough
. The screen appears as shown.
Figure 59
Expert Mode > WAN > NAT > Passthrough
The following table describes the labels in this screen.
Table 24
Expert Mode > WAN > NAT > Passthrough
LABEL
DESCRIPTION
ALG Setup
FTP
Select
Enable
to allow TCP packets with a specified port destination to pass through.
H.323
Select
Enable
to allow peer-to-peer H.323 calls.
SIP
Select
Enable
to make sure SIP (VoIP) works correctly with port-forwarding and
address-mapping rules.
SNMP
Select
Enable
to allow a manager station to manage and monitor the NBG6817 through
the network via SNMP.
Page 90 / 209
Chapter 10 WAN
NBG6817 User’s Guide
90
10.6
Dynamic DNS Screen
To change your NBG6817’s DDNS, click
Expert Mode > WAN > Dynamic DNS
. The screen
appears as shown.
Figure 60
Expert Mode > WAN > Dynamic DNS
RTSP
Select
Enable
to have the NBG6817 detect RTSP traffic and help build RTSP sessions
through its NAT.
IRC
Select
Enable
to allow clients to have real-time communications with others on the
Internet.
VPN Passthrough
PPTP
Select
Enable
to allow VPN clients to make outbound PPTP connections. It is required in
order to connect to a PPTP VPN account. If
PPTP
is disabled, then when a client sends a
request to a VPN server, the server will reply to the NBG6817 and the NBG6817 will drop
the request. When
PPTP
is enabled, the NBG6817 will forward the reply from the VPN
server to the client that initiated the request, and the connection will establish
successfully.
L2TP
Select
Enable
to allow VPN clients to make outbound L2TP connections. It is required in
order to connect to a L2TP VPN account. If
L2TP
is disabled, then when a client sends a
request to a VPN server, the server will reply to the NBG6817 and the NBG6817 will drop
the request. When
L2TP
is enabled, the NBG6817 will forward the reply from the VPN
server to the client that initiated the request, and the connection will establish
successfully.
IPSEC
Select
Enable
to allow VPN clients to make outbound IPSec connections. It is required in
order to connect to a IPSec VPN account. If
IPSEC
is disabled, then when a client sends
a request to a VPN server, the server will reply to the NBG6817 and the NBG6817 will
drop the request. When
IPSEC
is enabled, the NBG6817 will forward the reply from the
VPN server to the client that initiated the request, and the connection will establish
successfully.
Apply
Click
Apply
to save your changes back to the NBG6817.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 24
Expert Mode > WAN > NAT > Passthrough (continued)
LABEL
DESCRIPTION

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