Description:
An unconfigured LANCOM router is not found in a functioning TCP/IP network with subnets.
Solution:
When an unconfigured LANCOM router is switched on, the device evaluates local broadcasts to set its own provisional IP address. It takes the Class C portion of the IP address and adds 254 to it.
Example:
If the LANCOM receives a packet with the IP address 10.1.140.210, it gives itself the IP address 10.1.140.254. Since local broadcasts do not transmit network masks, the LANCOM always takes the netmask 255.255.255.0
In our example, the full address is:
10.1.140.254
255.255.255.0
This mechanism does not work with subnets like 255.255.255.240. For this reason, if you operate a subnet you must set the netmask via the outband interface (by serial cable).
This mechanism also does not work if a device exists already with an IP address with 254 at the end (in our example, 10.1.140.254).
In networks larger than class C, e.g. 255.255.240.0, the LANCOM in its unconfigured state can be reached in any C-class subnet under .254. |
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