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This is variously called the network mask length or prefix length, and it is represented as a / followed by the number of consecutive 1 bits in the network mask. Counting the number of consecutive 1 bits in the example totals 21, which can be represented as /21. Given a mask length, you can calculate the dotted-decimal representation of the mask.
The prefix-length in IPv6 is the equivalent of the subnet mask in IPv4. However, rather than being expressed in four octets like it is in IPv4, it is expressed as an integer between 1 through 128. For example: 2001:db8:abcd:0012::0/64 specifies a subnet with a range of IP addresses from: 2001:db8:abcd:0012: 0000:0000:0000:0000 - 2001:db8:abcd ...
Using a subnet prefix length other than a /64 will break many features of IPv6, including Neighbor Discovery (ND), Secure Neighbor Discovery (SEND) , privacy extensions , parts of Mobile IPv6 , Protocol Independent Multicast - Sparse Mode (PIM-SM) with Embedded-RP , and Site Multihoming by IPv6 Intermediation (SHIM6) , among others. A number of ...
Default subnet masks: Class A: 255.0.0.0 (prefix length : 8) Class B: 255.255.0.0 (prefix length : 16) Class C: 255.255.255.0 (prefix length : 24) This p appears to me like, if a network administrator uses Class C address, then, he will be limited to have maximum of 254 hosts (excluding 0 and 255), whereas, if he chooses Class A address, then ...
The IPv6 prefix concept is similar to IPv4 subnetting. An IPv6 address with a prefix is written as an IPv6 address followed by a decimal number representing the number of bits in the address that constitute the prefix. It is written as: is a decimal value specifying how many of the leftmost contiguous bits of the address comprise the prefix.
The prefix length denotes the number of leftmost bits set to 1 in the mask, so a prefix length of 24 denotes a mask of 255.255.255.0. Prefix lengths are contiguous and there is no way to specify a non-contiguous mask. Some routing protocols such as BGP use prefix length (and not mask) within the updates, so there is no way to even advertise a ...
Secondly, the prefix length (subnet mask) has nothing to do with the class of the address. See this answer for more information on how classful addressing actually works (and for a hint at the answer to your very last question). Now in the image it says 172.16.0.0/24 has two subnets: 172.16.1.0 and 172.16.2.0.
Abstract - IPv6 prefix length, as in IPv4, is a parameter conveyed and used in IPv6 routing and forwarding processes in accordance with the Classless Inter-domain Routing (CIDR) architecture. The length of an IPv6 prefix may be any number from zero to 128, although subnets using stateless address autoconfiguration (SLAAC) for address allocation ...
First, to answer your question directly: the official recommendation on this topic has changed. In the past, RFC 3627 is titled "Use of /127 Prefix Length Between Routers Considered Harmful" The current recommendation is different, though: RFC 6164 recommends using a /127 (not a /126!) on point-to-point links. Both RFCs outline the reasons for ...
Your last question could make sense if you reverse it to ask how many /64 networks can be made from a /30 prefix. The way to calculate that is to subtract 30 from 64 to get 34. The answer would be 2 to the power of the result. 64 - 30 = 34 2^34 = 17,179,869,184 That means you can derive 17,179,869,184 /64 networks from one /30 prefix.