Specifications

The VPN Protocol IPsec
AVM Access Server – 5 AVM Access Server Concepts and Functional Principles 85
The IP addresses in the example above are used in different ways:
Local Network
– The local network has the network address 192.168.10.0/24.
– Each client computer in the local network has an IP address in
the address range defined by this network address. These are
all private IP addresses which must never appear in the public
Internet. They are reserved under RFC 1918 for communication
within private LANs.
AVM Access Server (local)
– The AVM Access Server computer is likewise in the local net-
work.
– It communicates with the other computers in the LAN using an
internal IP address.
– The AVM Access Server also provides the LAN with its gateway
to the Internet.
– Its external IP address, a valid public Internet address, is dy-
namically assigned by the Internet Service Provider.
Remote Network
– The remote network has the network address
192.168.20.0/24.
– Each client computer in the local network has an IP address in
the address space defined by this network address. Here
again, these are all private IP addresses which must never ap-
pear in the public Internet. They are used only for internal com-
munication within the remote LAN.
AVM Access Server (remote)
– The remote AVM Access Server computer also has an address
in the remote network.
– It communicates with the other computers in its LAN using this
internal IP address.
– The AVM Access Server also provides the remote LAN with its
gateway to the Internet.
– Its external IP address, a valid public Internet address, is dy-
namically assigned by the Internet Service Provider.