From: James (james@towardex.com)
Date: Tue Dec 07 2004 - 16:08:12 GMT-3
On Wed, Dec 08, 2004 at 02:37:04AM +0800, kinwai wrote:
> Basically IPv6, you don't require subnetting at all. Subnetting is introduce in IPv4 to cut down the waste of IP address and stuff...
>
> In IPv6, it's fully classless. You don't see Class A,B,C addresses anymore. When a ISP issue u with a /48 mask (i know it's a lot but that's what they gonna issue you with) , just go ahead and use it..
>
> There's not much concept behind i guess, if you really want to split it up, just use a /50 mask or something? No trick, nothing ...
IPv6 is classless, but we have some standards for use:
a /32 is called Top Level Aggregator or TLA -- A LIR (Local Internet Registry)
or ISP is assigned a /32.
a /48 is called NLA ( If i recall correctly I think its network level, but
i could be wrong in what N stands for), which is handed out to a customer by
the ISP/LIR.
a /64 is the local prefix used as minimum size subnet. If you need to split up
your /48, the best practice to do so is to whip out a /64 off of it.
Remember, there are 65536 /64's in a /48 -- you got plenty of subnets to burn
in IPv6, not just huge amount of addresses! :)
-J
-- James Jun TowardEX Technologies, Inc. Technical Lead Boston IPv4/IPv6 Web Hosting, Colocation and james@towardex.com Network design/consulting & configuration services cell: 1(978)-394-2867 web: http://www.towardex.com , noc: www.twdx.net
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