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The VPN Protocol IPsec
NetWAYS/ISDN – 3 Remote Access with NetWAYS/ISDN 39
Original packet and IPsec encapsulated packet with new IP header
The illustration below shows a sample VPN connection in
Tunnel Mode. Here a remote stand-alone computer is con-
nected to the local company network.
Example: VPN Connection in Tunnel Mode
The IP addresses in the example above are used in different
ways:
Company network
The company LAN has the network address
172.16.0.0/16. Each computer in the company 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
The AVM Access Server computer has two network inter-
faces: one in the LAN and one with an external IP ad-
dress, i.e., a valid public Internet address which is dy-
namically assigned by the Internet Service Provider. The
Access Server communicates with the other computers
Payload dataIP header
Original packet
Possibly encrypted payload data
IP headerIPsecNew IP header
IPsec-encapsulated packet
Remote stand-alone
computer with
NetWAYS/ISDN
Company network
Network address: 172.16.0.0 /16
I
P address: 172.16.0.1
I
P address: 172.16.0.2
I
P address: 172.16.0.3
Public IP address: dynamically
assigned by the
Internet Service Provider
Virtual IP address: 172.16.0.10
AVM Access Server
Public IP address: 193.96.242.157
Internal IP address: 172.16.0.254
VPN Tunnel
netways-e.book Seite 39 Freitag, 28. November 2003 3:51 15
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