North American Network Operators Group|
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Re: v6 subnet size for DSL & leased line customers
Once upon a time, TJ <[email protected]> said: > Short answer - no spec for it. > ARIN breaks it at /56, as a nod towards maybe a /48 for everyone is > a bit much. On ARIN's site: The following guidelines may be useful (but they are only guidelines): * /64 when it is known that one and only one subnet is needed * /56 for small sites, those expected to need only a few subnets over the next 5 years. * /48 for larger sites For end sites to whom reverse DNS will be delegated, the LIR/ISP should consider making an assignment on a nibble (4-bit) boundary to simplify reverse lookup delegation. So, the guidelines are on 8 bit boundaries, but then right below they also suggest making assignments on 4 bit boundaries (and it is all "only guidelines"). -- Chris Adams <[email protected]> Systems and Network Administrator - HiWAAY Internet Services I don't speak for anybody but myself - that's enough trouble.