FEC0:1319:7700:F631:446A:5511:CC40:25AB Which part of the example IPv6 address is the prefix? Which quarter in the example prefix is used to identify the subnet?

• For IPv6 multicast addresses, the first eight bits are reserved as 1111 1111. Thus, the prefix of an IPv6 multicast address is ff00::/8. Similar to IPv6 Link Local addresses, it is easy to identify an IPv6 multicast address, because IPv6 multicast addresses have left most hexadecimal digits as "FF" Aug 21, 2016 · The ipv6-prefix variable follows general IPv6 addressing rules. The /prefix-length variable is a decimal value that indicates the number of contiguous, higher-order bits of the address that make up the network portion of the address. For example, 10FA:6604:8136:6502::/64 is a possible IPv6 prefix. For example, I have the IPv6 address 2001:470:1f15:1bcd:34::41 and prefix 96. Do you know a easy way to do bitwise and between IPv6 address and prefix? According to IPv4: 192.168.1.2 255.255.255.0 network : 192.168.1.0 So simple. I want to do the same thing to IPv6 address. But IPv6 address is 16 bytes, so you can't use unsigned int for that. Jun 08, 2018 · Here’s an example that’s requesting a /60 prefix. This example only shows the ipv6 portion of the configuration. config system interface edit "wan1" config ipv6 set ip6-mode dhcp set ip6-allowaccess ping set dhcp6-prefix-delegation enable set dhcp6-prefix-hint ::/60 end next end

Figure 2: The IPv6 link-local address, better illustration. The better illustration of an IPv6 link-local address is: Examples: fe80::1/10, fe80:1::1/32 and fe80::1:1/64 are all IPv6 link-local addresses; their prefix lengths are 10, 32 and 64 respectively. Each such IPv6 address has the leftmost 10 bits equal to binary 1111111010.

In the example above it means that 2001:1111:2222:3333 is the prefix (64 bits) and everything behind it can be used for hosts. When calculating subnets for IPv4 we can use the subnet mask to determine the network address and for IPv6 we can do something alike. For example, the IPv4-mapped IPv6 address ::ffff:c000:0280 is written as ::ffff:192.0.2.128, thus expressing clearly the original IPv4 address that was mapped to IPv6. Networks [ edit ] An IPv6 network uses an address block that is a contiguous group of IPv6 addresses of a size that is a power of two . For example, in the following IPv6 address: 2001:db8:abcd:0012:0000:0000:0000:0000 The network address is 2001:db8:abcd, and the subnet address is 12 (using the short form notation and eliminating the leading zeroes). Together, these two groupings are the IPv6 prefix. The device address in the example is 0000:0000:0000:0000. The example IPv6 address has the following subnet prefix. 2001:db8:3c4d:15::/64. The subnet prefix always contains 64 bits. These bits include 48 bits for the site prefix, in addition to 16 bits for the subnet ID. The following prefixes have been reserved for special use: 2002::/16. Indicates that a 6to4 routing prefix follows. fe80::/10

In this lesson we’ll take a look how you can create IPv6 prefixes and subnets so that you can configure your entire network with IPv6. We’ll start at the top where IANA (Internet Assigned Numbers Authority) is responsible for the global coordination of the IPv4 and IPv6 address space and move our way all the way to the bottom where we assign subnets and IPv6 addresses to our routers

Apr 01, 2020 · For example, the IPv6 address 2001:db8:acad::/48 has a global routing prefix that indicates that the first 48 bits (3 hextets) (2001:db8:acad) is how the ISP knows of this prefix (network). The double colon (::) following the /48 prefix length means the rest of the address contains all 0s. An IPv6 address, assigned to an IPv6/IPv4 node, which bears the high-order 96-bit prefix 0:0:0:0:0:0, and an IPv4 address in the low-order 32-bits. IPv4-compatible addresses were used by automatic tunneling; they are now deprecated because the current IPv6 transition mechanisms no longer use these addresses. There is no special prefix for an IPv6 anycast address. An IPv6 anycast address uses the same address range as global unicast addresses. Each participating device is configured to have the same anycast address. For example, servers A, B, and C in Figure 4-14 could be DHCPv6 servers with a direct Layer 3 connection into the network. These The part of the IPv6 address that identifies the subnet address is the quartet in the prefix. For example in the following address, FEC0:1319:7700:F631:446A:5511:CC40:25AB, the quartet used to identify the subnet is F631.