IT Baseline Protection Manual - The Information Warfare Site

Safeguard Catalogue - Communications Remarks
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Note: The IP address and the static name entered in WINS take priority over
the IP address allocated by the DHCP server. In this case a client reservation
is generated for the client which will be established in the WINS database.
The following files are stored in the directory
%SystemRoot%\SYSTEM32\DHCP, which is established when setting up a
DHCP server:
- DHCP.MDB is the DHCP database file.
- DHCP.TMP is a temporary file, which DHCP installs for temporary
database files.
- The files JET.LOG and JET*.LOG contain protocols with the complete
transactions that have been executed with the database. With the help of
these files, DHCP can reproduce possible lost data if required.
- SYSTEM.MDB is used by DHCP to save data regarding the structure of its
database.
Note: The files DHCP.TMP, DHCP.MDB, JET.LOG and SYSTEM.MDB
should neither be deleted nor changed in any way since this can lead to faulty
DHCP functions. Access to these files may only be granted to administrators
as, otherwise, unsupervised changes to DHCP configuration are possible.
WINS (Windows Internet Name Service)
Via WINS, NetBIOS-computer-names can be allocated to IP addresses.
Installation of a WINS server takes place as part of the installation of TCP/IP
on Windows NT servers. To achieve a better availability of servers and a
balanced workload, several WINS servers should be set up. Each WINS server
must be configured in such a way that it functions as a reproduction partner
for at least one other WINS server.
Information regarding the reproduction of database entries for the partner is
part of a WINS server configuration. A Pull-Partner is a WINS server that
obtains copies of database entries from its partner by first sending a request
and then receiving the desired copies. A Push-Partner is a WINS server that
sends its partner a renewal message, if something has changed in the WINS
database. If its partner then replies with a request for reproduction, the Push-
Partner sends a copy of the up-to-date WINS database to the reproduction
partner. To ensure that the databases on the primary WINS server and the
back-up server always correspond to one another, both servers must act as
Push and Pull-Partners. It is always advisable for reproduction partners to take
both roles, i.e. Push and Pull-Partner.
A particular point in time, length of time or number of data sets must be
determined for every WINS server as a threshold value. If this value is
reached, the reproduction of the databank will be performed. If a certain point
in time is determined for the reproduction, this will be carried out once. On the
other hand, if a certain length of time is established, reproduction will be
repeated according to the appropriate intervals. Within a geographical region
this could lie, for example, between ¼ and ½ an hour, whilst over larger
distances, intervals of a few hours can be selected.
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IT-Baseline Protection Manual: Oktober 2000