Global Name Server
Under
Local Services
->
DNS
->
Global Settings
->
Basic Parameters
you enter the IP ad-
dresses of global name servers that are asked if your device cannot answer requests itself
or by forwarding entries.
For local applications, the IP address of your device or the general loopback address
(127.0.0.1) can be entered as the global name server.
Your device can also receive the global name servers dynamically and transfer them dy-
namically if necessary.
Strategy for name resolution on your device
A DNS request is handled by your device as follows:
(1) If possible, the request is answered directly from the static or dynamic cache with IP
address or negative response.
(2) Otherwise, if a suitable forwarding entry exists, the relevant DNS server is asked, de-
pending on the configuration of the Internet or dialin connections, if necessary by set-
ting up a WAN connection at extra cost. If the DNS server can resolve the name, the
information is forwarded and a dynamic entry created in the cache.
(3) Otherwise, if global name servers are entered, the primary DNS server then the sec-
ondary DNS server are asked. If the IP address of your device or the loopback ad-
dress is entered for local applications, these are ignored here. If one of the DNS serv-
ers can resolve the name, the information is forwarded and a dynamic entry created in
the cache.
(4) Otherwise, if a suitable Internet or dialin connection is selected as the standard inter-
face, the relevant DNS server is asked, depending on the configuration of the Internet
or dialin connections, if necessary by setting up a WAN connection at extra cost. If
one of the DNS servers can resolve the name, the information is forwarded and a dy-
namic entry created in the cache.
(5) Otherwise, if overwriting the addresses of the global name servers is allowed (
DNS
Server Configuration
=
3)%
), a connection is set up – if necessary at extra cost
– to the first Internet or dialin connection configured to enable DNS server addresses
to be requested from DNS servers (
DNS Negotiation
=
#/
), if this has not
been already attempted. If name server negotiation is successful, these are entered
as global name servers and are therefore available for further requests.
(6) Otherwise the initial request is answered with a server error.
If one of the DNS servers answers with
. $
, the initial request is im-
mediately answered accordingly and a corresponding negative entry is made in the DNS
21 Local Services
Funkwerk Enterprise Communications GmbH
342
R1xxx/R3xxx/R4xxx
