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

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DHCP Server

FRITZ!Box Fon WLAN 7570 vDSL

131

3.2

DHCP Server

The FRITZ!Box is equipped with its own DHCP server. The

DHCP server is enabled by default in the factory settings.

Every time the operating system on a computer connected

with FRITZ!Box is started, it is assigned an IP address by the

DHCP server.

The IP address, the corresponding subnet mask and the ac-

tivated DHCP server automatically yield the following val-

ues:

In every subnet of the FRITZ!Box, the addresses 20 through

200 in the fourth group of numerals of the IP address are

reserved for the DHCP server.

Assigning the IP addresses via the DHCP server ensures

that all of the computers connected with the FRITZ!Box are

located in a single subnet.

Only one DHCP server may be active within any network.

Factory Settings

All computers are located in the

same IP network

enabled

IP address

192.168.178.1

Subnet mask

255.255.255.0

DHCP server

enabled

Network address of the subnet

192.168.178.0

Entire IP address pool for the com-

puters

192.168.178.2 -

192.168.178.253

Address pool of the DHCP server

192.168.178.20 - 200

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FRITZ!Box Fon WLAN 7570 vDSL

132

Fixed IP Addresses when the DHCP Server Is Enabled

If you would like to give fixed IP addresses to individual

computers connected with the FRITZ!Box, despite the fact

that the DHCP server is enabled, then you must disable the

option “Obtain an IP address automatically” in this com-

puter’s network settings and enter the fixed IP address

manually in the appropriate fields.

Which IP Addresses Can You Assign to the Computers?

°

The IP addresses must be from the same subnet as

FRITZ!Box.

°

The IP addresses may not come from the address pool

of the DHCP server.

If the factory settings are not changed, that means the fol-

lowing IP addresses are available:

Each IP address can be assigned only once.

Disabling the DHCP Server

You can switch off the DHCP server.

To make sure that all computers remain in the same subnet

as the FRITZ!Box even when the DHCP server is disabled,

you must enter the IP addresses manually in the comput-

er’s network settings. First disable the option “Obtain an IP

address automatically” and then enter the IP address man-

ually in the appropriate field.

The computers can receive their IP addresses from the

DHCP server only if the setting “Obtain an IP address auto-

matically” is enabled in the their IP settings. For more infor-

mation, see the section “IP Settings” from page 102.

192.168.178.2 - 192.168.178.19

192,168,178,201 - 192.168.178.253

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Changing the DHCP Server Settings

FRITZ!Box Fon WLAN 7570 vDSL

133

In the case of the preset IP address of the FRITZ!Box, the fol-

lowing IP addresses are available for assignment to the

computers:

Each IP address can be assigned only once.

Changing the DHCP Server Settings

Proceed as follows to open the DHCP server settings:

1.

Start a web browser on your computer.

2.

Enter

fritz.box

in the address line of the browser.

3.

Select the “Advanced Settings / System” menu in the

“Settings” area.

4.

Click “Expert Mode” in the “System” menu, enable the

setting “Show expert settings” and confirm this set-

ting by clicking “Apply”.

5.

Open the “System / Network Settings” menu.

6.

Click the “IP Addresses” button.

The “IP Settings” page is opened. Here you can make the

settings for the DHCP server.

3.3

Subnetwork

By default the option “All computers are located in the

same IP network” is enabled in the FRITZ!Box.

If the factory settings were not changed, this setting has the

following effect:

192.168.178.2 - 192.168.178.253

Factory Settings

All computers are located in the

same IP network

enabled

IP address

192.168.178.1

Subnet mask

255.255.255.0

DHCP server

enabled

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Disabling “All computers are located in the same IP network”

The DHCP server of the FRITZ!Box assigns all of the comput-

ers connected with the FRITZ!Box an IP address from the ad-

dress pool of the DHCP server.

This means that all of the computers connected with the

FRITZ!Box are located in the same subnet.

Disabling “All computers are located in the same IP

network”

If you switch off the setting “All computers are located in

the same IP network”, the interfaces of the FRITZ!Box will

receive their own IP addresses.

Factory Settings

Upon delivery the interfaces of the FRITZ!Box are configured

as follows:

Thus the following address pools are available to the DHCP

server:

Computers connected with the FRITZ!Box via different inter-

faces are located in different subnets.

Address pool of the DHCP server

192.168.178.20 - 200

Interface

IP Address

Subnet Mask

DHCP Server

LAN 1

192.168.178.1

255.255.255.0

enabled

LAN 2

like LAN 1

255.255.255.0

enabled

LAN 3

like LAN 1

255.255.255.0

enabled

LAN 4

like LAN 1

255.255.255.0

enabled

WLAN

192.168.182.1

255.255.255.0

enabled

Interface

Address Pool of the DHCP Server at the Interface

LAN 1

192.168.178.20 - 200

LAN 2

192.168.178.20 - 200

LAN 3

192.168.178.20 - 200

LAN 4

192.168.178.20 - 200

WLAN

192.168.182.20 - 200

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Disabling “All computers are located in the same IP network”

FRITZ!Box Fon WLAN 7570 vDSL

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Deactivating

Proceed as follows to disable the setting “All computers are

located in the same IP network”:

1.

Open your a web browser on your computer and enter

fritz.box

in the address line of the browser.

2.

Select the “Advanced Settings / System” menu in the

“Settings” area.

3.

Click “Expert Mode” in the “System” menu, enable the

setting “Show expert settings” and confirm this set-

ting by clicking “Apply”.

4.

Open the “System / Network Settings” menu.

5.

Click the “IP Addresses” button.

The “IP Settings” page is opened. Here you can change the

setting “All computers are located in the same IP network”.

Interface

Network Address of the Subnet

LAN 1

192.168.178.0

LAN 2

like LAN 1

LAN 3

like LAN 1

LAN 4

like LAN 1

WLAN

192.168.182.0

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