BinTec X3200, Руководство пользователя

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X3200 User’s Guide 221
Settings Specific to WAN Partners
6
The following scenario illustrates Keepalive Monitoring:
Figure 6-3: Keepalive Monitoring
Cutting costs The Keepalive Monitoring function enables you to configure X3200 in the
branch office so that unnecessary WAN connections from the head office to the
branch office are avoided. X3200 checks at regular, adjustable intervals to see
whether the hosts to be monitored in the LAN at the branch office can be
reached. If none of the hosts to be checked answers a corresponding request
after three consecutive attempts, connection setup by the central server is pre-
vented by X3200 deactivating the interface to the "head office" WAN partner.
The result is that the line to the branch office appears to be busy if the central
server at head office attempts to set up a connection. This means that no costs
are incurred for a connection, which would have been useless anyway.
B
IA
N
C
A /B
R
IC
K
-X
M
WAN
LAN IP
192.168.1.254
LAN IP
10.1.1.1
192.168.1.10
Group 0
192.168.1.20
Group 0
2
1
Headquarters Branch Office
Headquarter’s
Router
Central Server
No Host
reachable!
Reachable?
Reachable?
X3200
1 Connection setup attempt 2 X3200 is "busy", no connection is possible
In some countries (e.g. Switzerland), costs may still occur for these useless
dial-in attempts in spite of using Keepalive Monitoring.