At 08:40 PM 1/13/2013, Jason White wrote:
Tony Langdon <vk3jed@gmail.com> wrote:
A /64 should do most home networks.
It should indeed. However, if you're using neighbour discovery (e.g., radvd in Linux) to deliver addresses to hosts, my understanding is that you need to use a /64 due to the way in which the host address is calculated - usually from the MAC address.
Of course, you don't have to do that, and then it is possible to divide a /64 (would have to use static addressing or DHCPv6)
Consequently, it's hard to make subnets with only a /64. Some people, for example, prefer to separate wired and wireless networks.
I did say _most_ home networks. ;-)
Internode provide a /56, which should be more than enough for anything short of a large organization.
It's going to be more than I'll ever use. Only using a /64 out of my /56 at this stage.
I suspect you could work around the above issues using DHCPv6. I haven't looked at the available DHCPv6 servers in quite a while. When I last checked, ISC DHCP still had significant catching up to do, especially in its support for prefix delegation. To handle the connection to Internode, which relies on
DHCPv6 would be one option, static addressing another.
DHCPv6 prefix delegation to supply the /56 block, I use wide-dhcpv6-client; I then let neighbour discovery (via radvd) propagate addresses to the local LAN, which in practice means my laptop, as the other devices on the LAN are all IPv4-only equipment such as a SIP phone and a printer.
My router looks after all of that. The router is advertising a /64 prefix to the LAN. I have several IPv6 capable devices - a number of PCs, one Mac, and a handful of iPhones and iPads (yes, the iOS devices support IPv6).
Incidentally, a friend recently bought one of these multifunction (printer/scanner/fax) devices, which supports IPv6 in its networking firmware: http://www.brother-usa.com/mfc/modeldetail.aspx?PRODUCTID=mfc7860dw&tab=spec
Sign of the times. :-)
We'll see more of those. I also know people who would like to become informed of any IPv6-capable SIP phones on the market.
That would be handy, though the SIP gateways I use don't support IPv6 (yet). 73 de VK3JED / VK3IRL http://vkradio.com