User Guide

STPro solutions
ATMF25.6
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12 Networking Services - IP
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3EC 17059 ABAA TCZZA Ed. 01
The STPro offers some solutions to cope with this situation.
Basically these solutions boil down in transporting Public IP
addresses transparently through the STPro towards a device
where a more advanced NAT and/or PAT can be performed.
Some solutions are described in the following paragraphs:
 ATMF25.6 (if equipped)
 Via the PPPtoPPTP Relay
 PPPtoDHCP Spoofing.
The ATMF25.6 port offers maximum TCP/IP transparency
because it switches ATM cells and does not touch TCP/IP
information.
You might consider the following setup:
Step Action
1 Install both an ATMF25.6 PCNIC and Ethernet PCNIC in a PC.
2 Install an OS on this PC that has routing capabilities, e.g. Windows
NT, UNIX, etc.
3 Install on this PC a NAT/PAT package that supports all TCP/IP
protocols.
Now this PC can act as some 'home gateway'.
4 Connect the ATMF25.6 port of the STPro to the ATMF25.6 PCNIC.
5 Connect your local LAN to the Ethernet PCNIC.
The Public IP address goes transparently through the STPro to
end up in this advanced 'home gateway', where more complex
NAT and/or PAT operations can be performed.