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TABLE 34-4 Non-Internet IPv4 Local Network IP Addresses
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The broadcast address allows a system to send the same message to all systems on your network at once With IPv4 class-based IP addressing, you can easily determine the broadcast address using your host address: the broadcast address has the host part of your address set to 255 The network part remains untouched So the broadcast address for the host address 192168172 is 1921681255 (you combine the network part of the address with 255 in the host part) For CIDR IP addressing, you need to know the number of bits in the netmask The remaining bits are set to 1 (see Figure 34-3) For example, an IP address of 19216846/22 has a broadcast address of 1921687255/22 In this case, the first 22 bits are the network address and the last 10 bits are the host part set to the broadcast value (all 1s) In fact, you can think of a class C broadcast address as merely a CIDR address using 24 bits (the first three segments) for the network address, and the last 8 bits (the fourth segment) as the broadcast address The value 255 expressed in binary terms is simply 8 bits that are all 1s 255 is the same as 11111111
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IP Address 192168172 19216846/22 Broadcast Address 1921681255 1921687255/22 IP Broadcast Number 255 7255 (last 2 bits in 7) Binary Equivalent 11111111 1111111111
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Some networks have a computer designated as the gateway to other networks Every connection to and from a network to other networks passes through this gateway computer Most local networks use gateways to establish a connection to the Internet If you are on this type of network, you must provide the gateway address If your network does not have a connection to the Internet, or a larger network, you may not need a gateway address The gateway address is the address of the host system providing the gateway service to the network On many networks, this host is given a host ID of 1: the gateway address for a network with the address 1921681 would be 19216811, but this is only a convention To be sure of your gateway address, ask your network administrator
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Many networks, including the Internet, have computers that provide a Domain Name Service (DNS) that translates the domain names of networks and hosts into IP addresses These are known as the network s domain name servers The DNS makes your computer identifiable on a network, using only your domain name, rather than your IP address
FIGURE 34-3 Class-based and CIDR broadcast addressing
Part VIII:
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You can also use the domain names of other systems to reference them, so you needn t know their IP addresses You must know the IP addresses of any domain name servers for your network, however You can obtain the addresses from your system administrator (often more than one exists) Even if you are using an ISP, you must know the address of the domain name servers your ISP operates for the Internet
IPv6 Addressing
IPv6 addresses introduce major changes into the format and method of addressing systems under the Internet Protocol (see RFC 3513 at ietforg/rfc or faqsorg for more details) There are several different kinds of addressing with different fields for the network segment The host segment has been expanded to a 64-bit address, allowing direct addressing for a far larger number of systems Each address begins with a type field specifying the kind of address, which will then determine how its network segment is organized These changes are designed not only to expand the address space but also to provide greater control over transmissions at the address level
NOTE Most distributions already enable IPv6 support in the kernel Kernel support for IPv6 is
provided by the IPv6 kernel module Kernel configuration support can be found under Device Drivers | Networking Support | Networking Options | The IPv6 Protocol
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