88
Im
ple
m
en
tin
g s
ite
-to
-s
ite
V
P
N
c
on
ne
cti
on
s
4
LAN-to-LAN connections via the Internet involve the risk of data wiretapping or tampering. Thus, it will be necessary
to encrypt data. For a highly confidential network such as a closed network, the need for data encryption is reduced.
Because of this IPIP tunnel connections assure data confidentiality.
The following explains how to set up LAN-to-LAN connections with IPIP tunnels by connecting to a closed network
based on a contract in which only one fixed IP address is issued.
Linking LANs together through IPIP
tunnels using a closed network
Create an IPIP tunnel
in the closed network
No data will be transmitted
to the Internet
Closed
network
Internet
Internet
Site 1
Site 2
Site 3
DOWN
LOAD
POWER
STATUS
LAN
WAN
micro8D
USB
WAN
4
3
2
1
ON
STANDB
Y
CONSO
LE
LAN
DOWN
LOAD
POWER
STATUS
LAN
WAN
micro8D
USB
WAN
4
3
2
1
ON
STANDB
Y
CONSO
LE
LAN
DOWN
LOAD
POWER
STATUS
LAN
WAN
micro8D
USB
WAN
4
3
2
1
ON
STANDB
Y
CONSO
LE
LAN