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node wants to transmit is larger than the threshold, the RTS/CTS handshake gets

triggered. If the packet size is equal to or less than threshold the data frame gets sent

immediately.

System uses Request to Send/Clear to send frames for the handshake that provide

collision reduction for an access point with hidden stations. The stations are sending a

RTS frame first while data is sent only after a handshake with an AP is completed.

Stations respond with the CTS frame to the RTS, which provide clear media for the

requesting station to send the data. CTS collision control management has a time

interval defined during which all the other stations hold off the transmission and wait

until the requesting station will finish transmission.

TX Power:

display the data transmission rate power.

Short Preamble:

this option is to define the length of the sync field in an 802.11 packet.

Most modern wireless network uses shot preamble with 56 bit sync filed. By default, it is

disabled.

Short Slot:

by default, this is enabled.

Tx Burst:

enable this function will make it easy for you to enhance the performance in data

transmission.

Pkt_Aggregate:

by default, this is disabled.

20/40 BSS:

by default, it is enabled. Support 20/40 at the same time.

IGMP Snooping:

if you enable this function, multicast traffic will be forwarded to ports that

have members of that group. Disabling IGMP snooping will make multicast traffic treated in

the same manner as broadcast traffic.

Bandwidth:

by default, it is 1.

WMM Capable:

by default, it is disabled.

WMM

is an abbreviation of Wi-Fi Multimedia. It defines the priority levels for four access

categories derived from 802.1d (prioritization tabs). The categories are designed with

specific types of traffic, voice, video, best effort and low priority data.

APSD Capable:

it is disabled by default.

5.4 NAT/QoS

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5.4.1 Port Forwarding

You could choose to enable or disable this function according to your requirement.

Comment:

please enter the reason for this port forwarding action.

LAN IP:

the IP of the host that is connected to the internal network and needs to be

accessible form external network.

Protocol:

the L3 protocol type of the IP Address.

External Port:

range of the public port number.

Internal Port:

internal port number. It is the TCP/UDP port of the application running on the

host that is connected to the internal network.

Port Forwarding List:

the port forwarding list will show you the detailed information about

the forwarded port.

5.4.2 QoS

This page allows you to set rules for port bandwidth control.

QoS:

you can choose to enable this function if you need.

IP Address:

define the IP address range.

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Up/Down:

set the bandwidth for these IP addresses.

QoS List:

this form shows you the QoS rule.

5.4.3 DMZ

DMZ means Demilitarized Zone. It can be enabled and used as a place where services can

be placed such as Web Servers, Proxy Servers and E-mail Servers such that these

services can still serve the local network and are at the same time isolated from it for

additional security. DMZ is commonly used with the NAT functionality as an alternative for

the Port Forwarding while makes all the ports of the host network device be visible form the

external network side.

You can choose to enable or disable DMZ function.

IP Address:

types in the IP address of the DMZ host and click

Apply

.

5.5 Firewall

While the broadband users demand more bandwidth for multimedia, interactive

applications, or distance learning, security has been always the most concerned. The

firewall of this router helps to protect you local network against attack from unauthorized

outsiders. It also restricts users in the local network from accessing the Internet.

Furthermore, it can filter out specific packets that trigger the router to build an unwanted

outgoing connection.

5.5.1 IP/Port Filtering

Depending on whether there is an exist

ing Internet connection, or in other words “the WAN

link status is up or down”. You can restrict certain types of data packets from your local

network to Internet through the Gateway on this page.

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You can select to enable or disable IP/Port Filtering function. By default, it is disabled.

IP Address:

the IP address range that you want to filter.

Port:

the Port address that you want to filter.

Protocol Type:

choose which particular protocol type should be filtered. Here you can

choose UDP/TCP.

Schedule:

you can choose to always enable this filter function or create a schedule.

IP Filter List:

this table will list the detailed information about the IP addresses that you

want to filter.

5.5.2 MAC Filtering

On this page, you can add some MAC ad

dresses to be filtered to isolate users’ access from

wired LAN.

This router allows you to disable

MAC Filtering function or allow/deny MAC address listed.

MAC Name:

the name of the computer with the MAC you entered.

MAC Address:

you can enter the MAC addresses that you want to deny or allow.

DHCP Client:

display the information about one DHCP client.

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MAC Filter List:

this table will list the detailed information about the MAC addresses that

will be filtered.

5.5.3 URL Filtering

This page is used to deny LAN users from accessing the internet. Block those URLs which

contain keywords listed.

You can choose to enable or disable URL filtering function.

URL string:

type in the string contained in URLs that you don’t allow LAN users to access.

Enter the URLs that you don’t allow LAN users to access. And you can also click

Delete

button to delete the URLs you entered.