Alcatel AST570 User Manual page 210

16 Security Services - NAT & PAT
PPP to DHCP Spoofing
Result
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A second technique is to use the PPP to DHCP Spoofing feature of
the AST570. 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 AST570 to the PC's
Ethernet PC NIC port.
5 Connect your local (W)LAN to the other Ethernet PC NIC.
6 Configure the PC (acting as 'home gateway') as DHCP client.
7 Configure the AST570 as DHCP server.
8 DHCP in the AST570 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 AST570, 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.
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