6 Networking Services - IP, DHCP and DNS
6.1.2PPPoAtoPPTP Relaying
IP vs. PPPoA/PPTP
Private IP addresses
Public IP addresses
Simultaneous use of public & private IP
PPPIP address negotiation
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 AST350i 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 AST350i'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.
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