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Fixed IP Addresses when the DHCP Server Is Enabled
FRITZ!Box
76
The IP address, the corresponding subnet mask and the acti-
vated DHCP server automatically yield the following values:
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.
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 87.
Fixed IP Addresses when the DHCP Server Is Enabled
If you would like to give fixed IP addresses to individual com-
puters 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 computer’s net-
work settings and enter the fixed IP address manually.
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.
Network address of the subnet
192.168.178.0
Entire IP address pool for the
computers
192.168.178.2 - 192.168.178.253
Address pool of the DHCP server
192.168.178.20 - 200
192.168.178.2 - 192.168.178.19
192.168.178.201 - 192.168.178.253
Page 77 / 140
FRITZ!Box
77
Disabling the DHCP Server
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-
ers’ network settings. First disable the option “Obtain an IP
address automatically” and then enter the IP address man-
ually in the appropriate field.
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.
Open the FRITZ!Box user interface (see the section
“Opening the User Interface” from page 30).
2.
Click “Expert Mode” in the “System” menu, enable the
setting “Show expert settings” and confirm this set-
ting by clicking “Apply”.
3.
Open the “System / Network Settings” menu.
4.
Click the “IP Addresses” button.
The “IP Settings” page is opened. Here you can make
the settings for the DHCP server.
192.168.178.2 - 192.168.178.253
Page 78 / 140
Subnetwork
FRITZ!Box
78
9.4
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:
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. The following settings are
configured by default:
Factory Settings
All computers are located in the same IP net-
work
enabled
IP address
192.168.178.1
Subnet mask
255.255.255.0
DHCP server
enabled
Address pool of the DHCP server:
192.168.178.20 - 200
Interface
IP Address
Subnet Mask
DHCP Server
LAN 1
192.168.178.1
The subnet
mask
255.255.255.0
is set at every
interface.
The DHCP
server is en-
abled at every
interface.
LAN 2
like LAN 1
LAN 3
like LAN 1
LAN 4
like LAN 1
WLAN
192.168.182.1
Page 79 / 140
FRITZ!Box
79
Disabling the Setting “All computers are located in the same IP network”
This 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.
Disabling the Setting “All computers are located in the
same IP network”
Proceed as follows to open the DHCP server settings:
1.
Open the FRITZ!Box user interface (see the section
“Opening the User Interface” from page 30).
2.
Click “Expert Mode” in the “System” menu, enable the
setting “Show expert settings” and confirm this set-
ting by clicking “Apply”.
3.
Open the “System / Network Settings” menu.
4.
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
Address Pool of the DHCP Server at the Interface
LAN 1
192.168.178.20 - 200
LAN 2
like LAN 1
LAN 3
like LAN 1
LAN 4
like LAN 1
WLAN
192.168.182.20 - 200
Interface
Address Pool of the DHCP Server at the Interface
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
Page 80 / 140
Troubleshooting
FRITZ!Box
80
10
Troubleshooting
This chapter provides advice if you are not able to open the user interface
of your FRITZ!Box, if you are having problems with the WLAN connection,
or if you want to change the IP settings on your computer.
10.1
Errors Opening the User Interface
If you see an error message when you open the user inter-
face, work through the following steps to find the source of
the error and resolve the error.
Checking the
Cable Connections
Make sure that all cable connections are plugged in secure-
ly.
Entering an IP
Address
In the Internet browser, enter the following IP address in
place of “fritz.box”:
192.168.178.1
Obtaining an
IP Address
Automatically
The IP addresses of the connected computers must be as-
signed automatically (see “IP Settings” from page 87).
Checking the Internet Browser Settings
Check the settings of the Internet browser:
1.
The browser must use the network connection be-
tween the computer and FRITZ!Box when the user in-
terface is opened.
2.
The Internet browser must be in online operation.
3.
If the Internet browser uses a proxy server, the DNS
name and the IP address of the FRITZ!Box must be en-
tered as exceptions in the proxy settings of the web
browser.
4.
The user interface must be allowed to execute CGI
scripts.
The following example explains how to check the settings
of Internet Explorer 6:

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