Connecting Two Networks - Lancom 7100 VPN Manual

5 Connecting two networks

Network connectivity, also known as LAN-LAN connectivity, with the
LANCOM Router is used for interconnecting two local area networks. LAN-
LAN connectivity can be implemented in two basic ways:
VPN: Connecting LANs over VPN ensures that the Internet-based connec-
tion between the two LANs has high-security protection. Each LAN must
be equipped with a VPN-capable router.
ISDN: Connectivity based on ISDN uses a direct connection between the
two LANs via an ISDN connection. Each LAN must be equipped with a
router with an ISDN interface.
Setting up LAN-LAN connectivity is carried out with the familiar convenience
of a Setup Wizard.
Always configure both ends
Both of the routers for LAN-LAN connectivity must be configured. Note that
the configuration information at both ends must match.
The following instructions assume that LANCOM Routers are being

operated at both ends. It is possible to set up network connectivity
between routers from other manufacturers. However, this mixed con-
figuration frequently requires far-reaching modifications to both
devices. In cases like this refer to the Reference Manual.
Security aspects
Of course your LAN has to be protected from unauthorized access. For this
reason, a LANCOM provides a range of security mechanisms that offer an out-
standing level of protection.
VPN: VPN-based connectivity relies on IPsec for transferring data. The
encryption methods employed are 3-DES, AES or Blowfish
ISDN: Security for ISDN-based connectivity relies on password protection,
a check of the ISDN number, and the call-back function.
The ISDN call-back function cannot be set up by Wizard, but in the

manual configuration only. Refer to the reference manual for informa-
tion on this.
LANCOM 7100 VPN – LANCOM 9100 VPN
Chapter 5: Connecting two networks
37