AVM FRITZ-Box-Fon-WLAN-7570 Router Manual PDF (Setup & Configuration Guide)

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Standards for the Throughput Rate

FRITZ!Box Fon WLAN 7570 vDSL

121

Range

The range within a WLAN is highly dependent on the follow-

ing factors:

°

the WLAN adapter used

°

the structural conditions

°

the amount of radio traffic on the same frequency

band. Other WLAN networks, microwave ovens or

Bluetooth transmitters (mobile telephones) may be

active.

IEEE 802.11a

Because this standard works exclusively in the seldom

used 5-GHz range, it offers the opportunity to transmit data

relatively free of interference from external influences.

WLAN adapters that support 802.11a are much less com-

mon that devices that work in accordance with the

802.11b/g standard.

IEEE 802.11b

With a maximum throughput rate of 11 Mbit/s, this is the

oldest standard for radio networks. Older WLAN adapters of

the first generation can communicate with the FRITZ!Box

using 802.11b. However, if the WLAN adapter supports

newer standards such as 802.11g, the latest standard

should be used.

IEEE 802.11g

This is currently the most common WLAN standard. It com-

municates with a maximum of 54 Mbit/s gross in the 2.4-

GHz frequency range (ISM) and guarantees broad compati-

bility with many WLAN devices.

However, due to heavy use of the 2.4-GHz range, interfer-

ence is more common than in the less-used 5-GHz range.

IEEE 802.11n

This standard allows for high throughput rates and ranges.

The FRITZ!Box supports 802.11n in the 2.4-GHz frequency

band, or, if desired, also in the 5-GHz frequency band. Mod-

ulation processes and antenna techniques like MIMO (Mul-

tiple Input, Multiple Output) use the entire frequency band

available more effectively than the older standards.

The use of the 802.11n standard—and thus the availability

of higher throughput rates—is possible only if the WLAN

connection is secured using the WPA2 security mechanism

(AES-CCMP).

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FRITZ!Box Fon WLAN 7570 vDSL

122

The Standard for Security

Combining this standard with the 802.11g ensures compati-

bility with older WLAN adapters.

The Standard for Security

IEEE 802.11i

The

WPA2

security

mechanism

is

defined

in

the

IEEE 802.11i standard. WPA2 is an extension of the familiar

security mechanism WPA (Wi-Fi Protected Access).

The main feature of the extension of WPA to WPA2 is the

AES-CCMP encryption process:

FRITZ!Box supports the AES encryption procedure as part of

the WPA2 mechanism, and the TKIP encryption procedure

as part of the WPA mechanism. This means that the

FRITZ!Box can be used in combination with any WLAN

adapters that also support WPA2 with AES or WPA with TKIP.

2.2

Security

Security is of utmost importance within radio networks.

Therefore it is important that no unauthorized users can

register in a WLAN to use its Internet access or shared net-

work resources.

FRITZ!Box includes settings on various levels that contrib-

ute to the security of your WLAN and thus to the security of

your computers.

Mechanism

Encryption

WPA

TKIP (Temporary Key Integrity Protocol)

WPA2

TKIP

AES-CCMP

AES-CCM

based on the extremely secure AES (Advan-

ced Encryption Standard) procedure. CCM

(Counter with CBC-MAC Protocol) defines

how the AES procedure is applied to WLAN

packets.

Radio signals can also be received outside of office or resi-

dential spaces and abused for criminal purposes.

Page 123 / 159

Encryption

FRITZ!Box Fon WLAN 7570 vDSL

123

Encryption

The

most

important

security

setting

is

encryption.

FRITZ!Box supports the security mechanisms WEP (Wired

Equivalent Privacy), WPA (Wi-Fi Protected Access) and

WPA2 as follows:

°

As part of the WEP mechanism a static key is deter-

mined to serve for the encryption of the user data.

Enter the key in the WLAN security settings of the

FRITZ!Box. All of the WLAN adapters in your wireless

network must also use this key.

°

The WPA and WPA2 mechanisms provide for authenti-

cation while the connection is being established. For

this a WPA password must be defined.

When WPA is selected, the TKIP encryption method is

used to encrypt the user data. In WPA2 the AES-CCMP

encryption method is used.

The encryption method you configure here must also

be supported by your WLAN adapter.

The user data are encrypted using an automatically

generated key. This key is regenerated at regular inter-

vals.

The WPA password used may be 8 to 63 characters in

length. For increased security, however, the password

should be at least 20 characters long. Use numerals,

letters and special characters and combine capitals

and lower-case letters.

Default Setting

In the FRITZ!Box a method combining WPA + WPA2 encryp-

tion with the TKIP/AES-CCMP encryption method is precon-

figured. This setting allows you to use WLAN adapters that

support WPA (TKIP) or WPA2 (AES-CCMP) or both methods.

It is advisable to change the preconfigured WLAN key as

soon as possible. Changes to the settings can be config-

ured on the FRITZ!Box user interface.

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FRITZ!Box Fon WLAN 7570 vDSL

124

Encryption

Recommendation

If your WLAN adapter supports an encryption method that

is more secure than the one preconfigured in the FRITZ!Box,

you should select the more secure encryption method in

your FRITZ!Box.

To configure the best security settings possible with

FRITZ!Box and your WLAN adapter, please note the follow-

ing recommendations:

°

If your WLAN adapter supports WPA2 in accordance

with the 802.11i standard:

–

Enable WPA encryption.

–

Select

the

WPA

mode

“WPA2

(CCMP)”

or

“WPA+WPA2”.

–

Replace the WPA network key with a new, unique

value.

°

If your WLAN adapter supports the WPA mechanism,

but not the WPA2 mechanism:

–

Enable WPA encryption.

–

Select

the

WPA

mode

“WPA

(TKIP)”

or

“WPA+WPA2”.

–

Replace the WPA network key with a new, unique

value.

°

If your WLAN adapter supports neither the WPA nor the

WPA2 mechanism:

–

Enable WEP encryption.

–

Replace the WLAN key with a new, unique value.

We strongly recommend the use of a WLAN adapter that

supports WPA or WPA2 (for instance, the FRITZ!WLAN USB

Stick N). WEP is out of date and data encrypted with WEP

can be deciphered within minutes.

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Frequency Ranges

FRITZ!Box Fon WLAN 7570 vDSL

125

2.3

Frequency Ranges

WLAN uses the frequency range around 2.4 GHz in the ISM

band or, alternatively, the frequency range at 5 GHz.

You can use both frequency ranges with the FRITZ!Box.

2.4-GHz Frequency

Band

A WLAN in the 2.4-GHz frequency band works in the same

band as Bluetooth, microwave devices and many cordless

telephones. This means that interference may occur within

WLANs operated in the vicinity of such devices. Generally

the only adverse effects are to the transmission rate; abor-

ted connections and data losses are rare.

In the 2.4-GHz frequency range the European regulation au-

thorities have designated 13 channels for WLAN. One chan-

nel has a bandwidth of 20 MHz.

A channel can have a bandwidth of 20 MHz (throughput up

to 130 Mbit/s) or 40 MHz (throughput of up to 300 Mbit/s).

Channels located directly next to each other may overlap

and result in mutual interference. For instance, if several

WLANs are operated close to each other in the 2.4-GHz fre-

quency range with a bandwidth of 20 MHz, a distance of at

least five channels should be left empty between each two

channels used. This means that if channel 1 is selected for

one WLAN, the channels 6 through 13 can be selected for a

second WLAN. This maintains the minimum distance be-

tween channels.

WLAN

Autochannel

With the WLAN Autochannel function, the FRITZ!Box auto-

matically searches for the channel subject to the least inter-

ference. Should problems with interference persist despite

this function, try to identify the source of interference and

switch it off manually.

Additional tips on interference in the WLAN radio network

are presented in the section “Ruling Out Interference

Caused by Other Wireless Networks” from page 101.

5-GHz Frequency

Band

The FRITZ!Box can operate in the 5-GHz frequency band as

an alternative. This frequency range is used much less of-

ten than the most common 2.4-GHz frequency range.

Rate

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