Siemens SINAUT MD740-1 User Manual page 44

Configuration
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for data exchange is determined here. This may differ from
that of the Key Exchange, but not necessarily.
Encryption algorithm
See above.
Checksum algorithm/Hash
See above.
Perfect Forward Secrecy (PFS)
A method for the additional improvement of security during
data transfer. With IPsec, the keys for data exchange are
renewed at certain intervals. With PFS, new random
numbers are negotiated with the remote site instead of
deriving them from previously agreed random numbers.
Only if the remote site supports PFS, select Yes.
When selecting the connection type Transport (L2TP
Microsoft Windows) set Perfect Forward Secrecy (PFS) to
No.
Tunnel settings
Local network address
The appropriate netmask
With these two entries you give the address of the client
(network or computer) that is connected locally to the
SINAUT MD740-1 direct and which is protected by the das
SINAUT MD740-1. This address defines the local endpoint
of the connection.
Example:
If the computer that you are also using for the configuration
of the device is connected to the SINAUT MD740-1, then
these data could be:
Local network address: 192.168.1.1
The appropriate netmask: 255.255.255.0
See also Network example diagram, page 81.
SINAUT MD740-1