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configuration
Automatic self configuration
Link Control Protocol (LCP) is an integral part of PPP, and defined in the same
standard specification. LCP provides automatic configuration of the interfaces
at each end (such as setting datagram size, escaped characters, and magic
numbers) and for selecting optional authentication.
RFC 1994 describes Challenge-handshake authentication protocol (CHAP), preferred
for establishing dial-up connections with ISPs. Although deprecated, Password
authentication protocol (PAP) is often used.
After the link has been established, additional network (layer 3) configuration
may take place. Most commonly, the Internet Protocol Control Protocol (IPCP) is
available, although Internetwork Packet Exchange Control Protocol (IPXCP) and
AppleTalk Control Protocol (ATCP) were once very popular.
Both PPP and Dynamic Host Configuration Protocol (DHCP) offer support for
automatic configuration of interfaces. While DHCP is used primarily for
multi-point access, it may also be used on point-to-point links but only after
PPP has completed establishment of the essential link and network configuration.
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