Rüdiger Meier wrote:
On Thursday 17 November 2011, James Knott wrote:
However, this is an example of someone being stuck on IPv4 methods. With IPv4, the shortage of addresses limited what an ISP could offer. With IPv6, there's absolutely no valid reason for not offering at least a /64 subnet.
Of course there are valid reasons for this...
Such as??? As I mentioned, I can configure my tunnel for a subnet or single address, but that's my choice.
I get my IPv6 subnet from a tunnel broker and it's a /56 (256 /64 subnets).
If you want to setup your net for more than 256 users then you as their ISP would not give everybody a ::/64 net.
256 users???? A /56 subnet can support up to a trillion times the entire IPv4 address space. A /64 subnet allows 18.4 quintillion addresses. The IPv6 address space is huge. I've heard of comparisons such as the number of grains of sand on earth or the number of atoms in a ton of carbon. Another was if a 2"square represented the IPv4 address space, then IPv6 would be represented by the area of the solar system. Tell me again why an ISP should limit a customer to only one address.
Of course you are a bad ISP with only such a ::/56 net almost as bad as Lew's ISP with only ::/64 for 6000 users. The reason to "not offering at least a ::/64 subnet" for everybody is still_valid_.
I'm not sure you understand what you're implying here. a /56 network means that 56 of 128 address bits are used for the network address and the remaining 72 bits are used for local subnetting and host addresses. With a /56, you can have 256 subnets, each supporting 18.4 quintillion addresses. As for an ISP offering /64 subnets, that's the minimum size that allows using the MAC address to form the host address, using the current methods, where the 48 bit MAC is padded out to 64 bits. There is no shortage of /64 subnets. In fact, there are 2^64 or 18.4 quintillion of them. Even if an ISP is handing out /48 subnets (2^80 addresses each), the number of subnets is 65K times the entire IPv4 address space (2^16 x 2^32). -- To unsubscribe, e-mail: opensuse-factory+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-factory+owner@opensuse.org