[arin-ppml] ULA-C and reverse DNS

Michael Richardson mcr at sandelman.ca
Mon Mar 22 16:31:47 EDT 2010

Hash: SHA1

>>>>> "Owen" == Owen DeLong <owen at delong.com> writes:
    >> I think that this is something to repeat multiple times.
    >> I think that a lot of people regard address space as so valuable
    >> that it would be crazy to "waste" it by having two IPs addresses
    >> on a single machine.
    >> This is where I think the notion that people will pay $$$$ to
    >> have their address space routed by ISPs. It won't happen ---
    >> getting new PA will be almost free, and getting PI address space
    >> is a nominal charge given that you have $$$$ for that bribe.

    Owen> Getting is cheap. Deploying is another matter.  It is the
    Owen> desire to avoid the cost of deployment that will drive this,
    Owen> not the cost of the address space. Leo summed up one likely
    Owen> scenario rather well.

I disagree strongly.  This is not IPv4.
Maybe some organizations prefer to bribe their ISP.

Why is it is ARIN's business to set routing policy?

    Owen> Riddle me this... When you have a Link-Local, ULA-C, and a GUA
    Owen> address, how does one decide when to originate a connection
    Owen> from the GUA and when to use the ULA-C address?

    Owen> Until you have an answer for that that does not require
    Owen> updating applications, the multiple different-capability
    Owen> addresses per interface is a nice theory that is fraught with
    Owen> operational peril.

RFC3484 describes this:
   Default Address Selection for Internet Protocol version 6 (IPv6)

published Feb.2003. If you know the IETF of the early 2000s, some drafts
took many many months to get through the queue, so this represents 10
year old work.

On my Linux desktop I have a configuration file /etc/gai.conf that lets
me tweak some of the values.

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]   Michael Richardson, Sandelman Software Works, Ottawa, ON    |net architect[
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