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Chapter 3 Wizard setup 53
BCM50a Integrated Router Configuration — Basics
You can obtain your IP address from the IANA, from an ISP, or it can be assigned
from a private network. If you belong to a small organization and your Internet
access is through an ISP, the ISP can provide you with the Internet addresses for
your local networks. On the other hand, if you are part of a much larger
organization, consult your network administrator for the appropriate IP addresses.
Nailed-up connection (only with PPP)
A nailed-up connection is a dial-up line where the connection is always up
regardless of traffic demand. The BCM50a Integrated Router does two things
when you specify a nailed-up connection. First, idle timeout is disabled. Second,
the BCM50a Integrated Router tries to bring up the connection when turned on
and whenever the connection is down. A nailed-up connection can be expensive if
you are billed by your Internet connection usage time.
Do not specify a nailed-up connection unless your telephone company offers
flat-rate service or you need a constant connection and the cost is of no concern
NAT
Network Address Translation (NAT) is the translation of the IP address of a host
in a packet. For example, the source address of an outgoing packet, used within
one network to a different IP address known within another network.
Wizard setup configuration: second screen
The second wizard screen varies depending on which mode and encapsulation
type you use. All screens shown use the routing mode. Configure the fields and
click Next to continue.
Note: Regardless of your particular situation, do not create an arbitrary
IP address; always follow the guidelines above. For more information
about address assignment, refer to Address Allocation for Private
Internets (RFC 1597) and Guidelines for Management of IP Address
Space (RFC 1466).