BinTec X4000, User Manual

Page: 250 / 498

250 X4000 User’s Guide
Advanced Configuration of the Basic Unit with the Setup Tool
8
IPCP The same applies if the dynamic negotiation of name servers is activated for the
IP configuration of a WAN partner and X4000 is operating in Server Mode
(Dynamic Name Server Negotiation = server (send)). In this case, the
addresses of the global name servers or the address of X4000 itself can also
be sent for name server negotiations via IPCP to the WAN partner, who is the
IP address client.
If X4000 is operating in Client Mode (Dynamic Name Server Negotiation =
client (receive)), name server addresses can if necessary be negotiated with the
WAN partner, who is the IP address server, and sent to X4000 . These can be
entered as global name servers in X4000 and are thus available for future name
resolutions.
Strategy for Name Resolution in X4000
A DNS request is handled by X4000 as follows:
1. Can the request be answered directly from the static or dynamic cache (IP
address or negative answer)?
– If yes, the information is forwarded.
– If no, see 2.
2. Is a matching forwarding entry available?
In this case, the relevant DNS are asked. If the connection to the WAN
partner is not active, an attempt is made to set it up.
– If a DNS can resolve the name, the information is forwarded and a
dynamic entry created in the cache.
– If none of the DNS asked can resolve the name or no matching
forwarding entry is available, see 3.
3. Are global name servers entered?
In this case, the relevant DNS are asked. If the IP address of X4000 or the
loopback address is entered for local applications, these are ignored here.
– If a DNS can resolve the name, the information is forwarded and a
dynamic entry created in the cache.
– If none of the DNS asked can resolve the name or no static name
servers are entered, see 4.