User`s guide
IP vs. PPPoA/PPTP
Private IP addresses
Public IP addresses
Simultaneous use of
public & private IP
PPP IP address
negotiation
6 Networking Services - IP, DHCP and DNS
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6.1.2 PPPoAtoPPTP Relaying
Prior to using PPTP, local IP addresses must be configured. The use
of these IP addresses is limited to the local network.
You are free to choose any IP address as long as it is compatible
with your local network and is unique in that same network.
As the STHome has a preconfigured Net10" address
(10.0.0.138), you should configure IP addresses like 10.0.0.1,
10.0.0.2, ... on your PCs.
Note: IP addresses can be configured automatically via STHome's DHCP
server. See section 6.3 for more information.
A second set of (Public) IP addresses having endtoend scope will
automatically be negotiated via the PPP protocol inside your PC(s).
Both Public and Private IP addresses are active simultaneously
because of tunneling. In fact two nested" IP layers exist: the Public
IP layer which is carried within the Private IP layer on the local
LAN.
By default the PPTP tunnel application automatically negotiates the
Public IP address.
In case your SP instructs you to use a static IP address for Relayed
PPPoA, most dialin applications allow a static IP address to be
supplied.