by Matthew G. Naugle
Wiley Computer Publishing, John Wiley & Sons, Inc.
ISBN: 0471196568 Pub Date: 11/01/98
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Illustrated TCP/IP
by Matthew G. Naugle Wiley Computer Publishing, John Wiley & Sons, Inc. ISBN: 0471196568 Pub Date: 11/01/98 |
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Like today’s internet, IP addresses will be handed out by an internet service provider (an ISP such as MindSpringtm, MCItm, AT&Ttm, Concentric Networkstm, and any of the other thousands of internet connectivity providers out there). Connection of a commercial entity directly to the Internet will not be allowed, unless that entity is an ISP. The address shown on this slide was extracted from the previous slide for it is the most common address format that will be used (except for the multicast addresses).
The first 3 bits identify the address as a provider-oriented unicast address. The registry ID identifies the internet address registry (currently InterNIC [for the Americas], APNIC [for Asia-Pacific], and RIPE [for Europe] which assigns provider identifiers, indicated by the provider ID field, to internet service providers, which then assigns portions of the address space to subscribers. This is a process similar to the address assignment policy used with CIDR and described in RFC 2050. The subscriber ID distinguishes among multiple subscribers attached to the internet service provider identified by the provider ID. This is like a customer number. The subnet ID identifies a specific physical link. There can be multiple subnets on the same physical link; however, a specific subnet cannot span multiple physical links. The interface ID identifies a single interface among the group of interfaces identified by the subnet prefix.
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