More services
BAT54-Rail/F..
Release
7.54
06/08
12.1
Automatic IP address administration with
469
If only one computer in the network is started up that is requesting an IP ad-
dress via DHCP with its network settings, a device with an activated DHCP
module will offer this computer an address assignment. A valid address is
taken from the pool as an IP address. If the computer was 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 computer.
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 es-
tablished, the requesting computer is assigned the address found.
U Netmask 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. The order is
the same as during the assignment of the addresses.
U 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.
Note: The default setting for the broadcast address should be changed by
experienced network specialists only. Incorrect configuration of this sec-
tion can result in the undesired establishment of connections subject to
connect charges!
U Standard 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.
U DNS and NBNS assignment
This assignment is based on the associated entries in the 'TCP/IP-module'.
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