[Cerowrt-devel] dynamic dns and ipv6 and "preferred lifetime"

Michael Richardson mcr at sandelman.ca
Mon Oct 8 13:57:16 EDT 2018

Dave Taht <dave.taht at gmail.com> wrote:
    > I have a machine whose ipv6 address I'd like to register in dns. I used
    > to use the ddns tool in openwrt to do this, but I don't think it quite
    > does what I want.

    > the ip tool now has json capability, yea, but basically I have rotating
    > addresses that expire.

You don't want to register temporary addresses, you want to turn them off.
Publishing your super-private address in DNS makes it not private, so don't
do that.   You want stable private addresses.

You either do this in NetworkManager, or net.ipv6.conf.all.use_tempaddr = 0


    > And other stuff that also expires but is mildly painful. I can do this
    > to show the current primaries

    > ip -c -6 addr show primary | grep -A 1 2603

    > and the same, so I can delete secondaries

    > So I can see having a nsupdate (or linode api) script that parses this
    > all properly and sends it "up there", or roll my own, but I was hoping
    > for a recommendation, that does it as addresses change...

]               Never tell me the odds!                 | ipv6 mesh networks [
]   Michael Richardson, Sandelman Software Works        | network architect  [
]     mcr at sandelman.ca  http://www.sandelman.ca/        |   ruby on rails    [

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