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‘DTIM Interval’

The Delivery Traffic Indication Message (DTIM) is a countdown value that informs wireless clients of the next

opportunity to receive multicast and broadcast messages. This value ranges between 1 and 16384.

‘Fragmentation Threshold’

Packets that are larger than this threshold are fragmented into multiple packets. Try to increase the fragmentation

threshold if you encounter high packet error rates. Do not set the threshold too low, since this can result in reduced

networking performance.

‘RTS Threshold’

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II sends Request to Send (RTS) packets to the Wireless client in order to negotiate the dispatching of

data. The Wireless client responds with a Clear to Send (CTS) packet, signaling that transmission can commence.

In case packets are smaller than the preset threshold, the RTC/CTS mechanism is not active. If you encounter

inconsistent data flow, try a minor reduction of the RTS threshold size.

‘MAC Filtering Mode’

You can filter wireless users according to their MAC address, either allowing or denying access. Choose the action

to be performed by selecting it from the drop down menu. Then usse the ‘MAC Filtering Settings’ option to add and

remove MAC Addresses to the list of allowed or denied clients.

5.2.4.3

Wireless Security

To configure your wireless security, enable this feature by checking its ‘Enabled’ check-box on the ‘Configure LAN

Wireless Access Point’ screen (see Figure 5.40). The screen will refresh, displaying the wireless security options

(see Figure 5.42). Click ‘Apply’ to if you wish to save this change.

‘Stations Security Type’

Select the type of security protocol for securing your wireless network. Choose between WPA, WPA2, WPA and

WPA2, 802.1x WEP, and Non-802.1x WEP. The screen will refresh, presenting each protocol’s configuration

respectively.

•

‘WPA’

(see Figure 5.42) - a data encryption method for 802.11 wireless LANs.

‘Authentication Method’

Select the authentication method you would like to use. You can choose between Pre-Shared Key and 802.1x.

‘Pre-Shared Key’

This entry appears only if you had selected this authentication method. Enter your encryption key in the ‘Pre-

Shared Key’ field.

You can use either an ASCII or a Hex value by selecting the value type in the combo box provided.

‘Encryption Algorithm’

Select whether to use the Temporal Key Integrity Protocol (TKIP) or the Advanced Encryption Standard (AES) for the

encryption algorithm. ‘Group Key Update Interval’ Defines the time interval in seconds for updating a group key.

Figure 5.42 WPA Wireless Security Parameters

•

‘WPA2’

(see Figure 5.43) – an enhanced version of WPA, and defines the 802.11i protocol.

‘Authentication Method’

Select the authentication method you would like to use. You can choose between Pre-Shared Key and 802.1x.

‘Pre-Shared Key’

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This entry appears only if you had selected this authentication method. Enter your encryption

key in the ‘Pre-Shared Key’ field. You can use either an ASCII or a Hex value by selecting the value type in the

combo box provided.

‘Encryption Algorithm’

The encyption algorithm used for WPA2 is the Advanced Encryption Standard (AES). ‘Group Key Update Interval’

Defines the time interval in seconds for updating a group key.

Figure 5.43 WPA2 Wireless Security Parameters

•

‘WPA and WPA2’

Mixed Mode (see Figure 5.44)– a mixed data encryption mode.

‘Authentication Method’

Select the authentication method you would like to use. You can choose between Pre-Shared Key and 802.1x.

‘Pre-Shared Key’

This entry appears only if you had selected this authentication method. Enter your encryption key in the ‘Pre-

Shared Key’ field. You can use either an ASCII or a Hex value by selecting the value type in the combo box

provided.

‘Encryption Algorithm’

The encyption algorithm used for WPA and WPA2 is a either the Temporal Key Integrity Protocol (TKIP) or the

Advanced Encryption Standard (AES). ‘Group Key Update Interval’ Defines the time interval in seconds for

updating a group key.

Figure 5.44 WPA and WPA2 Wireless Security Parameters

•

‘802.1x WEP’

(see Figure 5.45) - a data encryption method utilizing a statically or automatically defined key for

wireless clients that use 802.1x for authentication and WEP for encryption. You may define up to four keys but

use only one at a time.

‘Generate Keys Automatically’

Select this option to generate the encryption keys automatically rather than entering them manually. The screen

will refresh, hiding the table of keys described below.

‘Group Key Update Interval’

Defines the time interval in seconds for updating a group key.

‘Active’

Select the encryption key to be activated.

‘Encryption Key’

Type the encryption key until the entire field is filled. The key cannot be shorter than the field’s length.

‘Format’

Select the character type for the key: Hex or ASCII.

‘Key Length’

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Select the key length in bits: 40 or 104 bits.

Figure 5.45 802.1x WEP Wireless Security Parameters

The encryption key must be defined in the wireless Windows client as well. This is done in the Connection

Properties Configuration window (to learn how to reach this window, please refer to section 5.2.6). If you have

manually defined the encryption key, you must also specify it in this window (see Figure 5.46). If you have chosen

the automatic key generation, check the “The key is provided for me automatically” check box instead.

Figure 5.46 Connection Properties Configuration

1.

In the ‘Network Authentication’ combo box, select “Shared”.

2.

In the ‘Data Encryption’ combo box, select “WEP”.

3.

Enter your encryption key in both the ‘Network key’ and the ‘Confirm network key’ fields.

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•

‘Non-802.1x WEP’

- a data encryption method utilizing a statically-defined key for wireless clients that do not

use 802.1x for authentication but WEP for encryption.

This method’s configuration is virtually identical to the 802.1x WEP method described above, excluding the

automatic key generation and the group key update interval specification. Please refer to the 802.1x WEP section

above when configuring this method. Remember that the static key must be defined in the wireless Windows

client as well.

Figure 5.47 Non-802.1x WEP Wireless Security Parameters

5.2.4.4

Internet Protocol

Select one of the following Internet Protocol options from the ‘Internet Protocol’ drop down menu:

•

No IP Address

•

Obtain an IP Address Automatically

•

Use the Following IP Address

Please note that according to the selection you make in the ‘Internet Protocol’ drop down menu, the screen will

refresh and display relevant configuration settings.

‘No IP Address’

Select ‘No IP Address’ if you require that this connection will have no IP address.

Figure 5.48 Internet Protocol Settings - No IP Address

‘Obtain Address Automatically’

Select ‘Obtain Address Automatically’ if you require that this connection will try to

obtain its IP address from a DHCP server.

Figure 5.49 Internet Protocol Settings - DHCP

‘Use the Following IP Address’

The LAN connection is usually configured using a permanent (static) IP address.

Your service provider should provide you with this address, and subnet mask.

Figure 5.50 Internet Protocol Settings - Static IP

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5.2.4.5

DNS Server

It is possible to specify IP addresses of primary and secondary DNS servers if for instance local domain names

should be handled by local name servers. Note that for the Cellular WAN interface, DNS servers are configured

separately.

Figure 5.51 DNS Server

5.2.4.6

IP Address Distribution

The ‘IP Address Distribution’ section allows you to configure the gateway’s Dynamic Host Configuration Protocol

(DHCP) server parameters. The DHCP automatically assigns IP addresses to network PCs. If you enable this

feature, make sure that you also configure your network PCs as DHCP clients. For a comprehensive description of

this feature, please refer to section 6.6.10.

Select one of the following options from the ‘IP Address Distribution’ combo-box:

•

DHCP Server

‘Start IP Address’

The first IP address that may be assigned to a LAN host. Since the gateway’s default IP address is 192.168.1.1,

this address must be 192.168.1.2 or greater.

‘End IP Address’

The last IP address in the range that can be used to automatically assign IP addresses to LAN hosts.

‘Subnet Mask’

A mask used to determine to what subnet an IP address belongs. An example of a subnet mask value is

255.255.0.0.

‘WINS server’

If you use a Windows Internet Naming Service (WINS), specify the WINS server address in this field.

‘Lease Time In Minutes’

Each device will be assigned an IP address by the DHCP server for a this amount of time, when it connects to the

network. When the lease expires the server will determine if the computer has disconnected from the network.

If it has, the server may reassign this IP address to a newly-connected computer. This feature ensures that IP

addresses that are not in use will become available for other computers on the network.

‘Provide Host Name If Not Specified by Client’

If the DHCP client does not have a host name, the gateway will automatically assign one for him.

Figure 5.52 IP Address Distribution - DHCP Server