BinTec X4000, Руководство пользователя

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X4000 User’s Guide 237
Settings Specific to WAN Partners
8
off. As it is not possible to determine whether the hosts can be reached until the
connection is set up, costs are incurred by the calling party, i.e. the head office.
Figure 8-3: Keepalive Monitoring
Cutting costs The Keepalive Monitoring function enables you to configure X4000 in the
branch office so that unnecessary WAN connections from the head office to the
branch office are avoided. X4000 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
prevented by X4000 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
X4000
Bin Tec
4000
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?
1 Connection setup attempt 2 X4000 is "busy", no
connection is possible