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470
12.1
Automatic IP address administration with
BAT54-Rail/F..
Release
7.54
06/08
If no server is specified in the relevant fields, the router passes its own IP ad-
dress 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.
U Period of validity for an assignment
The addresses assigned to the computer are valid only for a limited period of
time. Once this period of validity has expired, the computer can no longer use
these addresses. In order for the computer to keep from constantly losing its
addresses (above all its IP address), it applies for an extension ahead of time
that it is generally sure to be granted. The computer loses its address only if
it is switched off when the period of validity expires.
For each request, a host can ask for a specific period of validity. However, a
DHCP server can also assign the host a period of validity that differs from
what it requested. The DHCP module provides two settings for influencing
the period of validity:
D Maximum lease time in minutes
Here you can enter the maximum period of validity that the DHCP server
assigns a host.
If a host requests a validity that exceeds the maximum length, this will
nevertheless be the maximum available validity!
The default setting is 6000 minutes (approx. 4 days).
D Default lease time in minutes
Here you can enter the period of validity that is assigned if the host
makes no request. The default setting is 500 minutes (approx. 8 hours).
U Precedence for the DHCP server—request assignment
In the default configuration, almost all the settings in the Windows network
environment are selected in such a way that the necessary parameters are
requested via DHCP. Check the settings by clicking Start
 Settings  Con-
trol Panel
 Network. Select the TCP/IP entry for your network adapter and
open Properties.
Check the various tabs for special entries, such as for the IP address or the
standard gateway. If you would like all of the values to be assigned by the
DHCP server, simply delete the corresponding entries.
On the 'WINS configuration' tab, the 'Use DHCP for WINS Resolution' option
must also be selected if you want to use Windows networks over IP with
name resolution using NBNS servers. In this case, the DHCP server must
also have an NBNS entry.
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