User's Manual Part 1

Network SupportChapter —4
122 700 Series Color Mobile Computer User’s Manual
AutoIP/DHCP
Automatic Private IP Addressing (AutoIP) is enabled by default in Pocket
PC 2002. To remain compatible with other Pocket PC devices, this setting
needs to be enabled. You can configure the registry settings in the
following to set the required AutoIP/DHCP behavior:
S For Ethernet:
HKEY_LOCAL_MACHINE\Comm\LAN9001\TcpIp
S Fot 802.11b:
HKEY_LOCAL_MACHINE\Comm\NETWLAN1\TcpIp
Other registry keys that can modify the behavior of AutoIP are as follows.
You can find the appropriate settings and behavior of each of these keys in
Microsoft Help.
S AutoInterval
S AutoMask
S AutoSubnet
S AutoIP
S AutoSeed
When a TCP/IP client cannot find a DHCP server, it generates an AutoIP
address from the 169.254.xxx.xxx block. The client then tries to check for
a D HCP server every 300 seconds (5 minutes) and if a DHCP server is
found, the client drops the AutoIP address a nd uses the address from the
DHCP server.
In the MSDN Windows CE documentation, see “Automatic Client Config-
uration” for more information on AutoIP.
To disable AutoIP, set the AutoCfg registry entry to “0.” If a DHCP server
cannot be found, instead of using AutoIP, the system will display the “Un-
able to obtain a server assigned IP address” message.
Note: If AutoIP is defined using CAB files, the EnableDHCP registry key
must also be defined and set to “1” before the system will attempt to ob-
tain a DHCP address.
To extend the number of attempts that a DHCP client makes to get a
DHCP address, use the DhcpRetryDialogue and DhcpMaxRetry registry
settings.
Change the AutoInterval registry key value to make the client retry more
often to obtain a DHCP address.