Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 161 views

    IPv6 Prefix and Subnetting Facts PDF

    Uploaded by

    vacas_A4500
    The document discusses IPv6 addressing and subnetting. It explains that: - The 64-bit IPv6 prefix can be divided into parts with different meanings, with the prefix length identifying how many bits are in the relevant portion of the prefix. - ICANN assigns address ranges to RIRs, which then assign smaller ranges to ISPs, who assign even smaller 48-bit ranges to individual sites/networks. - Sites can then divide their 48-bit address space into 64-bit subnets for allocating to devices on their local network.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd

    IPv6 Prefix and Subnetting Facts PDF

    Uploaded by

    vacas_A4500
    161 views2 pages
    The document discusses IPv6 addressing and subnetting. It explains that: - The 64-bit IPv6 prefix can be divided into parts with different meanings, with the prefix length identifying how many bits are in the relevant portion of the prefix. - ICANN assigns address ranges to RIRs, which then assign smaller ranges to ISPs, who assign even smaller 48-bit ranges to individual sites/networks. - Sites can then divide their 48-bit address space into 64-bit subnets for allocating to devices on their local network.

    Original Description:

    IPv6 Prefix and Subnetting Facts

    Original Title

    IPv6 Prefix and Subnetting Facts.pdf

    Copyright

    © Attribution Non-Commercial (BY-NC)

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    The document discusses IPv6 addressing and subnetting. It explains that: - The 64-bit IPv6 prefix can be divided into parts with different meanings, with the prefix length identifying how many bits are in the relevant portion of the prefix. - ICANN assigns address ranges to RIRs, which then assign smaller ranges to ISPs, who assign even smaller 48-bit ranges to individual sites/networks. - Sites can then divide their 48-bit address space into 64-bit subnets for allocating to devices on their local network.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    161 views2 pages

    IPv6 Prefix and Subnetting Facts PDF

    Uploaded by

    vacas_A4500
    The document discusses IPv6 addressing and subnetting. It explains that: - The 64-bit IPv6 prefix can be divided into parts with different meanings, with the prefix length identifying how many bits are in the relevant portion of the prefix. - ICANN assigns address ranges to RIRs, which then assign smaller ranges to ISPs, who assign even smaller 48-bit ranges to individual sites/networks. - Sites can then divide their 48-bit address space into 64-bit subnets for allocating to devices on their local network.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    11/10/13

    labsim.testout.com/Default.aspx?mincachedate=10-31-2013-11-00

    IPv6 Prefix and Subnetting Facts


    The 64-bit prefix can be divided into various parts, with each part having a specific meaning. The prefix length identifies the number of bits in the relevant portion of the prefix. To indicate the prefix length, add a slash (/) followed by the prefix length number. Bits past the end of the prefix length are all binary 0s. For example, the full 64-bit prefix for address 2001:0DB8:4898:DAFC:200C:FBBC:A007:8973 is 2001:0DB8:4898:DAFC:0000:0000:0000:0000/64. Full quartets with trailing 0's in the prefix address can be omitted (for example 2001:0DB8:4898:DAFC::/64). If the prefix is not on a quartet boundary (this applies to any prefix that is not a multiple of 16), any hex values listed after the boundary should written as 0's. For example, the prefix 2001:0DB8:4898:DAFC::/56 should be written as 2001:0DB8:4898:DA00::/56. Remember, only leading 0's within a quartet can be omitted. Be aware that the prefix length number is a binary value, while the prefix itself is a hexadecimal value. Global routing information is identified within the 64-bit prefix by subdividing the prefix using varying prefix lengths. The following graphic is an example of how the IPv6 prefix could be divided:

    This sample assignment of IPv6 addresses is explained in the following table: Prefix Description The Internet Corporation for Assigned Names and Numbers (ICANN) is responsible for the assignment of IPv6 addresses. ICANN assigns a range of IP addresses to Regional Internet Registry (RIR) organizations. Each current regional organization corresponds roughly to a continent.

    Regional Internet The exact size of the address range assigned to the RIR may vary, but current guidelines assign a Registry minimum prefix of 12-bits. In the above example, the RIR has been assigned a 12-bit prefix, and is (RIR) responsible for addresses in the following range: 2000::/12 to 200F:FFFF:FFFF:FFFF::/64

    Internet Service The exact size of the address range assigned by the RIR may vary, but current guidelines assign a Provider minimum prefix of 32-bits. In the above example, the ISP has been assigned a 32-bit prefix, and is
    labsim.testout.com/Default.aspx?mincachedate=10-31-2013-11-00

    A regional organization subdivides its block of IP addresses into smaller blocks and assigns those blocks to National Internet Registries (NIR), Local Internet Registries (LIR), or Internet Service Providers (ISP). Larger organizations can further subdivide the address space to allocate to smaller ISPs.

    1/2

    11/10/13

    labsim.testout.com/Default.aspx?mincachedate=10-31-2013-11-00

    (ISP)

    therefore responsible for addresses in the following range: 2001:0DB8::/32 to 2001:0DB8:FFFF:FFFF::/64 Individual companies and other organizations request blocks of IP addresses from an ISP for use in their private networks. Each network organized by a single entity is often called a site, although the exact definition of the term is under debate. Although the exact size of the address range assigned to a site may vary, by convention, each site is assigned a 48-bit site ID. In the above example, the site is responsible for managing the addresses in the following range: 2001:0DB8:4898::/48 to 2001:0DB8:4898:FFFF::/64

    Site

    ISPs typically follow these guidelines for assigning address ranges to sites: By default, all sites that represent a network, including home networks, get an address with a 48bit prefix. Sites that require an address space larger than this might be assigned two consecutive blocks, or might be allocated an address with a 47-bit prefix. If the network is known to have only a single subnet, the ISP might assign a 64-bit prefix. This is typically used for mobile devices. If the network is known to have only a single device, such as a dialup connection, the ISP might assign a 128-bit prefix. Most networks receive an address range identified with a 48-bit prefix. The remaining 16-bits in the global routing prefix are then used by the local network administrator for creating subnets. In the example above, the site has received the prefix of 2001:0DB8:4898::/48. The following list shows some of the subnets that could be created by the administrator using a 64-bit prefix:

    Subnet ID

    2001:0DB8:4898:0001::/64 2001:0DB8:4898:0002::/64 2001:0DB8:4898:0003::/64 ... 2001:0DB8:4898:FFFD::/64 2001:0DB8:4898:FFFE::/64 2001:0DB8:4898:FFFF::/64

    labsim.testout.com/Default.aspx?mincachedate=10-31-2013-11-00

    2/2

    You might also like