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Operating modes and functions
69
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ELSA LANCOM Wireless IL-II
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EN
If only one computer in the network is booted and requests an IP address via
DHCP with its network settings, a device with an activated DHCP module will
assign this computer an address. A valid address is taken from the pool as
an IP address. If the computer was already assigned an IP address at some
point in the past, it requests this same address and the DHCP server attempts
to reassign it this address if it has not already been assigned to another com-
puter.
The DHCP server also checks whether the address selected is still available
in the local network. As soon as the uniqueness of an address has been
established, the requesting computer is assigned the address found.
Subnet mask assignment
The network mask is assigned in the same way as the address. If a network
mask is entered in the DHCP module, this mask is used for the assignment.
Otherwise, the network mask from the TCP/IP module is used.
Broadcast address assignment
Normally, an address yielded from the valid IP addresses and the network
mask is used for broadcast packets in the local network. In special cases,
however (e.g. when using subnetworks for some of the workstation comput-
ers), it may be necessary to use a different broadcast address. In this case,
the broadcast address to be used is entered in the DHCP module.
The default setting for the broadcast address should be changed by experi-
enced network specialists only.
DNS and NBNS assignment
This assignment is based on the associated entries in the 'TCP-IP module'.
If no server is specified in the relevant fields, the router passes its own IP
address as a DNS address. This address is determined as described under 'IP
address assignment'. The router then uses DNS-forwarding (also see
'DNS-forwarding'), to resolve DNS or NBNS requests from the host.
Default gateway assignment
The device always assigns the requesting computer its own IP address as a
gateway address.
If necessary, this assignment can be overwritten with the settings on the
workstation computer.
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