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Page 71 / 168 Scroll up to view Page 66 - 70
68
Subnet Mask:
the default Subnet mask on the router.
Enable IGMP Snooping:
Enable or disable the IGMP Snooping function. Without IGMP snooping,
multicast traffic is treated in the same manner as broadcast traffic - that is, it is forwarded to all
ports. With IGMP snooping, multicast traffic of a group is only forwarded to ports that have
members of that group.”
When enabled, you will see two modes:
L
Standard Mode:
In standard mode, multicast traffic will flood to all bridge ports when no
client subscribes to a multicast group.
L
Blocking Mode:
In blocking mode, the multicast data will be blocked when there are no
client subscribes to a multicast group, it won’t flood to the bridge ports.
Enable LAN Side Firewall:
Blocking all service on the LAN side. After activating it, the user on the
LAN side can't access CPE any more. But, you still can enjoy the internet service on the LAN side.
But
Note
that by default the remote access (HTTP service in WAN side, you can go to
Service
to
enable remote access service) is disabled, thus if you enable LAN Side Firewall, then in this case,
you can have no access to manage this CPE through both LAN and WAN, the only method you
can adopt is to restore the CPE to default setting.
DHCP Server
You can disable or enable the DHCP (Dynamic Host Configuration Protocol) server or enable the
router’s DHCP relay functions. The DHCP protocol allows your router to dynamically assign IP
addresses to PCs on your network if they are configured to obtain IP addresses automatically.
L
Disable DHCP Server:
Disable the DHCP Server function.
L
Enable DHCP Server:
Enable the DHCP function, enter the information wanted. Here as
default.
Start IP Address:
the start IP address of the range the DHCP Server used to assign to the Clients.
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69
End IP Address:
the end IP address f the range the DHCP Server used to assign to the Clients.
Leased Time:
Set the leased time for each DHCP Client.
Static IP List:
The specified IP will be assigned to the corresponding MAC Address listed in the following table
when DHCP Server assigns IP Addresses to Clients.
Press
Add
to the Static IP List.
Enter the MAC Address, IP Address and Host Name, then click Apply to confirm your settings.
L
DHCP Server Relay
If you check
DHCP Relay
then you must enter the IP address of the DHCP server which assigns an
IP address back to the DHCP client in the LAN. Use this function only if advised to do so by your
network administrator or ISP.
Configure the second IP Address and Subnet Mask for LAN interface:
This function allows the creation of multiple virtual IP interfaces on this router. It helps to connect two
or more local networks to the ISP or remote node.
IP Address:
Specify an IP address on this virtual interface.
Netmask:
Specify a subnet mask on this virtual interface.
Click
Apply
to apply your settings.
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70
NAT
NAT (Network Address Translation) feature translates a private IP to a public IP, allowing multiple
users to access the Internet through a single IP account, sharing the single IP address. It is a natural
firewall for the private network.
Virtual Servers
In TCP/IP and UDP networks a port is a 16-bit number used to identify which application program
(usually a server) incoming connections should be delivered to. Some ports have numbers that are
pre-assigned to them by the IANA (the Internet Assigned Numbers Authority), and these are referred
to as “well-known ports”. Servers follow the well-known port assignments so clients can locate them.
If you wish to run a server on your network that can be accessed from the WAN (i.e. from other
machines on the Internet that are outside your local network), or any application that can accept
incoming connections (e.g. Peer-to-peer/P2P software such as instant messaging applications and
P2P file-sharing applications) and are using NAT (Network Address Translation), then you will
usually need to configure your router to forward these incoming connection attempts using specific
ports to the PC on your network running the application. You will also need to use port forwarding if
you want to host an online game server.
The reason for this is that when using NAT, your publicly accessible IP address will be used by and
point to your router, which then needs to deliver all traffic to the private IP addresses used by your
PCs. Please see the
WAN
configuration section of this manual for more information on NAT.
The device can be configured as a virtual server so that remote users accessing services such as
Web or FTP services via the public (WAN) IP address can be automatically redirected to local
servers in the LAN network. Depending on the requested service (TCP/UDP port number), the
device redirects the external service request to the appropriate server within the LAN network.
This part is only available when NAT is enabled.
Click
Add
to add new rules.
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71
The following configuration page will appear to let you configure.
Use Interface:
select from the drop-down menu the interface you want the virtual server(s) applies
to.
Server Name:
L
Select a Service:
select the server name from the drop-down menu.
L
Custom Service:
it is a kind of service to let users customize the service they want. Enter the
user-defined service name here. It is a parameter only available when users select
Custom
Service
in the above parameter.
Server IP Address:
Enter your server IP Address here.
External Port
L
Start:
Enter a port number as the external starting number for the range you want to give
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72
access to internal network.
L
End:
Enter a port number as the external ending number for the range you want to give
access to internal network.
Internal Port
L
Start:
Enter a port number as the internal staring number.
L
End:
Here it will generate automatically according to the End port number of External port
and can’t be modified.
Protocol:
select the protocol this service used: TCP/UDP, TCP, UDP.
Note:
The "Internal Port End" cannot be modified directly. Normally, it is set to the same
value as "External Port End". However, if you modify "Internal Port Start", then "Internal Port
End" will be set to the same value as "Internal Port Start".
Set up
1.
Select a Server Name from the drop-down menu, then the port will automatically appear, modify
some as you like, or you can just leave it as default. Remember to enter your server IP Address.

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