BinTec X3200, User Manual

Page: 230 / 419

230 BinTec Communications AG
Advanced Configuration
6
HOSTS files must be updated on every PC, this method of name resolution
is not very practicable.
In practice, the DNS of the Internet Service Provider is often used for name res-
olution.
Advantages of Name Resolution with X3200
X3200 has the following functions and facilities for name resolution (port 53):
■
DNS Proxy, for passing DNS requests to the right DNS.
■
DNS Cache, for saving the results of DNS requests.
■
Static name entries, for defining assignments of names to IP addresses.
■
Filter function, to prevent the resolution of certain names.
■
Monitoring via Setup Tool, to provide an overview of DNS requests in
X3200 .
This is how it works:
DNS Proxy DNS Proxy makes the tedious updating of HOSTS files on PCs in the LAN un-
necessary, as you can enter X3200 as DNS on the relevant PCs. DNS requests
are passed by the PC to X3200 for processing. The configuration of the PCs in
the LAN is then easy and can also be left at provider changes. This also works
if the PCs in the LAN do not have any static DNS entries, but are assigned these
dynamically by X3200 as DHCP server.
Forwarding entries enable X3200 to decide which DNS is to be used for the res-
olution of certain names. If, for example, you have configured two WAN partners
in X3200 , your head office and your Internet Service Provider, it is advisable to
have Internet names resolved by the DNS of your ISP, but names from within
the corporate network by the DNS of the head office. A DNS request for resolu-
tion of an internal company address usually cannot be answered by the DNS of
the ISP and is thus superfluous, causes unnecessary costs and resolution takes
longer than necessary. A forwarding entry, which passes DNS requests for
names such as "*.intranet.de" to the WAN partner "head office", is therefore ad-
visable.