12-03-2007
A modem connection can or cannot get its IP address via DHCP, the two things do NOT have to do anything with each other at all.
For DHCP to work you have to have a working IP-capable interface. Such an interface could be a NIC (connected, correct drivers installed, etc.) but also a PPP-line, a SLIP-line or several other things. PPP, like SLIP and several others, are layer-2-protocols and just "create" (so to say) a line able to transmit IP traffic.
So what you do in fact is: using some Layer-2-protocol you call a network interface able to transmit/receive IP traffic into existence. This interface may - in terms of IP configuration - be configured via DHCP like any other interface called into existence.
bakunin
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PPP(4) BSD Kernel Interfaces Manual PPP(4)
NAME
ppp -- point to point protocol network interface
SYNOPSIS
options PPP_BSDCOMP
options PPP_DEFLATE
options PPP_FILTER
pseudo-device ppp
DESCRIPTION
The ppp interface allows serial lines to be used as network interfaces using the Point-to-Point Protocol (PPP). The ppp interface can use
various types of compression and has many features over the SLIP protocol used by the sl(4) interface.
Supported options are:
options PPP_BSDCOMP Enable support for BSD-compress (`bsdcomp') compression in ppp.
options PPP_DEFLATE Enable support for deflate compression in ppp.
options PPP_FILTER This option turns on pcap(3) based filtering for ppp connections. This option is used by pppd(8) which needs to be
compiled with PPP_FILTER defined (the current default).
DIAGNOSTICS
ppp%d: af%d not supported . The interface was handed a message with addresses formatted in an unsuitable address family; the packet was
dropped.
SEE ALSO
inet(4), intro(4), sl(4), pppd(8), pppstats(8)
The Point-to-Point Protocol (PPP), RFC 1661, July 1994.
HISTORY
The ppp device appeared in NetBSD 1.0.
BUGS
Currently, only the ip(4) and ip6(4) protocols are supported.
BSD
January 10, 2005 BSD