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Technical training
APIPA (Automatic Private IP Addressing).
Under Windows, the IP address is usually configured
by default. The device APIPA automatically assigns an address between
169.245.0.1 and 169.254.255.254 if the computer fails to connect on a DHCP
server (or alternate address in the Control Panel).
If the computer can subsequently connect to a DHCP
server, it resumes a normal IP address (from Windows 2000). You can also request
to "repair connection" in XP or 2003 server and following
This address range is 169.254.XX particular, it is
private. It can communicate with equipment in the same address range and never
on the Internet (routing not possible). It is also possible to configure the
computer with a DNS server, gateway address default or a WINS server (connected
to NetBios).
APIPA is available on Win98 operating systems,
Windows Millennium, 2000 Win XP, VISTA, Seven and 2003- 2008
To disable this function, you can assign a fixed IP
address or edit the registry.
In the case of a single adapter (Win 2003):
Add entry IPAutoconfigurationEnabled with a REG_DWORD value to 0 under
HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ Tcpip \
paremeters \ Interfaces \ interface and restart the computer.
To disable all adapters (Win 2003):
Attach the entry IPAutoconfigurationEnabled with a REG_DWORD value to 0
under HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ Tcpip \
paremeters and restart the network server.