Re: IPv6 Addressing Help

From: Jack Bates (no email)
Date: Mon Aug 17 2009 - 10:15:23 EDT

  • Next message: Serge Vautour: "atac.fr DNS problem"

    Jon Lewis wrote:
    > On Fri, 14 Aug 2009, David Freedman wrote:
    >
    >> Will keep it simple, this is what I (and I suspect many others) do
    >>
    >> /128 - Loopback (what else?)
    >> /126 - Router p2p
    >> /112 - Router LAN shared segments (p2mp)
    >
    > Why even go that big on LAN segments? i.e. If you have a LAN/VLAN where
    > you have say 20 devices (routers, switches, etc.) and know you'll never
    > have more than say 50-100 devices, why not go as far as using a /120?

    As long as it makes the nibble, I don't think it really matters much. I
    wouldn't assign anything to a router p2p unless it's on the nibble, just
    for administrative ease. That being said, presentation in routers is
    much cleaner using /64's, with perhaps 1 /64 broken into loopbacks,
    which will still stay relatively short in display. It may be wasteful,
    but minimal in waste compared to the /48's we hand out to customers.

    My first /48 was assigned for internal use, and as an ISP, I doubt I'll
    ever use it all even with an extreme amount of waste.

    My favorite shortcut was 2607:f780::1 which is assigned to the
    reachability server, as easy as I could make it for customers to ping by
    number when troubleshooting with the helpdesk.

    -Jack


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