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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.

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AVM Access Server englisch Spécifications Page 87