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Link-Local Address (LLA)
•
LLA is also known as Auto-IP. It is used for unmanaged networks including direct connections from a GigE
Vision device to a dedicated NIC.
•
A subnet configured with LLA cannot send packets across routers but only via Ethernet switches.
•
LLA is the recommended scheme when only one NIC is connected to GigE cameras. LLA is fully automatic
requiring no user input.
Ensure only one NIC is using LLA on your PC, otherwise IP conflicts will result.
•
The NIC will automatically assign a random IP address within the 169.254.x.x subnet. The LLA protocol
ensures there are no conflicts with other devices through an arbitration scheme.
•
The Windows NIC configuration must be set to DHCP (the typical default case) and no DHCP server must be
present on the network. Otherwise, an IP address gets assigned by the DHCP server. Windows will turn to LLA
when no DHCP server answers requests coming from the NIC.
•
Windows takes up to 1 minute to obtain an LLA IP address. With Windows XP, with no DHCP server
involved, the network adapter icon in the system tray (in Windows XP) typically shows "limited or no
connectivity".
This is normal (see Microsoft KB article #892896) and indicates that the network does not have connectivity
beyond routers.
•
Windows and Genie are still running the DHCP process in the background. If a DHCP server becomes
available on the network, the NIC will get a DHCP assigned IP address for the connected device but
connections on the LLA IP address will be lost.
•
Important: If the host system has multiple NIC devices configured with LLA, then the communication stack
cannot accurately resolve which NIC to forward an IP packet on the 169.254 segment. Limit the number of NIC
configured using LLA to one interface. See "GigE Server Warning Example 1a: IP error with multiple
on page 114
for additional information.
•
Use the DALSA Network tool to change the Genie from the default DHCP/LLA mode to Persistent IP mode
when required, such as when there are multiple NIC devices with Genie connected to each. Note that DALSA
recommends DHCP/LLA as the mode of operation where a switch is used to connect multiple Genie devices.
DHCP (Dynamic Host Configuration Protocol)
•
This Genie IP configuration mode requires a DHCP server to allocate an IP address dynamically. The Genie
must be configured to have DHCP enabled. This is the factory default settings.
•
The DHCP server is part of a managed network. Windows XP itself does not provide a DHCP server function.
A dedicated DHCP server is required. Open-source DHCP server software can be found on the Internet, but
they might not provide the same level of functionality as commercial-grade DHCP servers.
•
A DHCP server is recommended where there are multiple NIC ports with multiple GigE Vision devices
attached. Each NIC ports must use a different subnet to avoid IP address conflicts (see "GigE Server Warning
Example 1a: IP error with multiple
DHCP server for any additional subnet.
•
Under Windows, a NIC is configured in DHCP mode by default. If no DHCP server is present on a given
subnet, Windows will revert to LLA as explained in the section above.
•
Ensure that a different subnet is assigned to each NIC on the network. Typical ranges are 192.200.x.x or
10.10.x.x for internal networks.
78 • Network Overview & Tools
NICs" on page
114). Persistent IP assignment is required if there is no
Genie Monochrome Series-GigE Vision Camera
NICs"
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