qr code c# tutorial FIGURE 24-2 IPv6 unicast address 16 23 32 48 64 80 96 112 128 in Objective-C

Make Quick Response Code in Objective-C FIGURE 24-2 IPv6 unicast address 16 23 32 48 64 80 96 112 128

FIGURE 24-2 IPv6 unicast address 16 23 32 48 64 80 96 112 128
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IPv6 unicast packet
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Registry ISP prefix Site prefix
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Subnet prefix Subnet ID Interface ID
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24: IPv6
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The last half of the IPv6 address, the interface ID, represents a particular interface within the site One requirement with addresses from 2000::/3 through E000::/3 is that the interface ID must have a 64-bit value in it to be considered valid Therefore, addresses that have 0s for the last 64 bits are considered invalid IPv6 unicast addresses For example, 2004:1234:5678:90AB:: is invalid, since the interface ID (the last 64 bits that is, the last four sets of numbers) are binary zeroes The interface ID is typically composed of a part of the MAC address of the interface When this is done, the interface ID is commonly called an extended unique identifier 64 (EUI-64) Figure 24-3 shows an example of the frame with a EUI-64 format The OUI part of the LAN NIC s MAC address is mapped into the first 24 bits of the interface ID The seventh bit in the highest order byte is set to 1, indicating that the interface ID is unique across the site, or 0, indicating that it is unique within the local scope only The OUI mapping is followed by the 16-bit value of FFFE The last 24 bits of the MAC address are then mapped into the last part of the interface ID
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Addresses that have 0s for the interface ID part of a unicast IPv6 address are invalid For example, this
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would be an invalid IPv6 unicast address: 2001:5005::
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FIGURE 24-3
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MAC address 24 OUI NIC ID
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EUI-64 interface ID
80 FF
96 FE
Interface ID IPv6 unicast EUI-64 ID
Address Assignment
CERTIFICATION OBJECTIVE 2403
Address Assignment
You can use four methods to assign an interface an IPv6 address: two are done statically and two dynamically The following three sections discuss these four options
Static Address Assignment
One option you have is to statically assign a unicast address to a device s interface using either of these two approaches:
Specify all 128-bits manually Use EUI-64
You can manually specify the entire 128-bit address, or you can specify the subnet ID and have the device use the EUI-64 method to create the interface ID part of the address If you re manually entering the entire address, remember that sets of fields that have 0s in them can be abbreviated with :: The EUI-64 method is the more common approach by most network administrators
DHCPv6
DHCPv6 is an update of the DHCP protocol in IPv4 and works similarly to the previous version with a few differences Before the client can begin, it must first detect a router on the link via a neighbor discovery process If the client detects a router, the client examines the router advertisement messages to determine whether DHCPv6 has been set up If the router specifies that DHCPv6 is supported, or no router advertisement messages are seen, the client will begin to find a DHCPv6 server by generating a DHCP solicit message This message is sent to the ALL-DHCP-Agents multicast address, using the link-local scope to ensure the message isn t forwarded, by default, beyond the local link An agent is either a DHCPv6 server or a relay, such as a router In DHCPv4 (IPv4 addressing), you had to configure the IP Helper feature on Cisco routers when the DHCP server was not on the same segment as the requesting clients IP Helper had the router redirect a DHCP request either to a particular server or a directed broadcast address of the segment that had one or more DHCP servers This is no longer necessary in DHCPv6: if no server is on the link, a relay can
24: IPv6
forward the request to the ALL-DHCP-Agents multicast address with the site-local scope You still have the option of doing this statically: this is necessary if you want to control which DHCPv6 server or servers should process the request
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