User Guide

PPPtoDHCP Spoofing
Result
16 Network Security - NAT & PAT
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3EC 36231 ABAA TCZZA Ed. 01
A third technique is to use the PPPtoDHCP Spoofing feature of
the STPro. The network configuration is practically identical to the
one described above:
Step Action
1 Install two Ethernet PCNICs 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 (one of) the Ethernet port(s) of the STPro to the PC's
Ethernet PCNIC port.
5 Connect your local LAN to the other Ethernet PCNIC.
6 Configure the PC (acting as 'home gateway') as DHCP client.
7 Configure the STPro as DHCP server.
8 DHCP in the STPro must be configured for DHCP Spoofing. See
subsection 14.4.2 for more information.
9 At least one PPP connection must begin with the mnemonic "DHCP"
in its phonebook name, e.g. DHCP_Spoof.
As soon as a DHCP request from the home gateway hits
the STPro, a PPPtoDHCP Spoofing connection is triggered.
The IP parameters that are negotiated with the remote peer are
carried up to the home gateway via a DHCP reply message.