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1 Introduction to the Cisco Broadband Operating System 78-6599-01 04/09/99

Cisco Broadband Operating System User Guide

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The list below deﬁnes the terminology used in this chapter.

• Dynamic Host Conﬁguration Protocol (DHCP)—Assigns IP addresses and other

conﬁguration parameters to hosts dynamically. The DHCP protocol is described in RFC

2131, which obsoletes RFC 1541.

• Network Address Translation (NAT)—Converts IP addresses on a private network

(designated as “inside” or “LAN”) to global IP addresses that are valid on another

registered network (designated as “outside” or “WAN”). NAT operates on a router that

connects two or more networks together. Port-level multiplexed NAT is used to translate

all internal private addresses to ports within one or more outside registered IP addresses.

• PPP/Internet Protocol Control Protocol (IPCP)—Dynamically conﬁgures IP

addresses over Point-to-Point Protocol (PPP). The Cisco CPE family uses PPP/IPCP to

dynamically negotiate its own registered WAN interface IP address from a central

access server. PPP/IPCP and DHCP are different methods of assigning addresses. The

67x can also be provisioned to obtain its LAN-side (ETH0) address via IPCP.

• DHCP Client—An Internet host using DHCP to obtain conﬁguration parameters such

as a network address.

• DHCP Server—An Internet host that returns conﬁguration parameters to DHCP

clients.

• Inside—The set of network addresses that are subject to conversion by NAT. These

addresses exist on the LAN side of the router.

• Outside—Commonly referred to as legal or global addresses. These addresses exist on

the WAN side of the router.

• Outbound Trafﬁc—Trafﬁc from an inside host to an outside host

• Inbound Trafﬁc—Trafﬁc from an outside host to an inside host.

• Lease Time—The amount of time that an address given to a DHCP client by a DHCP

server remains valid. The lease time can be either:

— A ﬁnite lease-time in which the client must renew the lease before it expires in order

to continue using the address.

— An inﬁnite lease-time in which the client maintains the same IP address as long as

it stays connected to the network

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