Re: ipv6 transit over tunneled connection

From: Christopher Morrow (no email)
Date: Fri May 14 2010 - 14:57:20 EDT

  • Next message: Seth Mattinen: "Re: ipv6 transit over tunneled connection"

    On Fri, May 14, 2010 at 2:29 PM, Franck Martin <> wrote:
    > I said somewhere in here... wierd quoting happened.
    > On Thu, May 13, 2010 at 6:18 PM, Michael Ulitskiy <>
    > wrote:
    >> Hello,
    >> We're in the early stage of planning ipv6 deployment -
    >> learning/labbing/experimenting/etc. We've got to the point when we're
    >> also planning to request initial ipv6 allocation from ARIN.
    >> So I wonder what ipv6 transit options I have if my upstreams do not
    >> support native ipv6 connectivity?
    >> I see Hurricane Electric tunnel broker BGP tunnel. Is there anything
    >> else? Either free or commercial?
    > 1) see gblx/ntt/sprint/twt/vzb for transit-v6
    > 2) tunnel inside your domain (your control, your MTU issues, your
    > alternate pathing of tunnels vs pipe)
    > 3) don't tunnel beyond your borders, really just don't
    > tunnels are bad, always.
    > -chris
    > I see so many times, that tunnels are bad for IPv6, but this is the way IPv6 has been designed to work when you
    > cannot get direct IPv6. So I would not say tunnels are bad, but direct IPv6 is better (OECD document on IPv6
    > states the use of tunnels).

    Tunnels promote poor paths, they bring along LOTS of issues wrt PMTUD,
    asymmetry of paths, improper/inefficient paths (see example paths from
    several ripe preso's by jereon/others), longer latency. If the tunnel
    exits your border you can't control what happens and you can't affect
    that tunnels performance characteristics. it's 2010, get native v6.

    > If the issue with tunnel is MTU, then a non-negligible part of IPv4 does not work well with MTU different of 1500.
    > With IPv6 we bring the concept of jumbo packets, with large MTU. If we cannot work with non standard MTUs in
    > IPv6 tunnels, how will we work with jumbo packets?

    a non-negligible part of the ipv6 internet doesn't work at all with
    >1280 mtu... due to tunnels and some other hackery :( jumbo packets
    are a fiction, everyone should stop 10 years ago believing they will
    ever work end-to-end between random sites.


  • Next message: Seth Mattinen: "Re: ipv6 transit over tunneled connection"

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