Re: [Cerowrt-devel] meanwhile... .home, finally has a home.arpa.

[Mikael Abrahamsson <swmike@swm.pp.se>]

On Tue, 23 Oct 2018, Dave Taht wrote:

> I just ping6 my upstream dns server, roughly the same algorithm. But
> if it goes down, you don't want to take away the local ipv6 addresses,
> just the default route, and when you do that, you end up falling back to
> ipv4.

I want to lower the preferred lifetime for the PD PIO from that connection 
to 0 when upstream lifecheck fails (ie, send RA with 0 preferred 
lifetime). So correct, don't take away the addresses, just make sure 
they're not chosen anymore for outgoing connections.

> You probably live in a place with reliable power. I get a power flicker 
> at least once a week. the corest routers are on battery backup but that 
> only lasts a few hours and the last big outage was about 9 hours about 6 
> weeks ago. When everything reboots, chaos reigns. When only some things 
> reboot, different kinds of chaos reign.

Right. The frequent re-addressing of interfaces (every time it goes up and 
down actually) is one thing I pointed out years ago is a weak spot in the 
homenet implementation.

> Secondly a usable set of /56s would be "enough" in my case (about 40 
> boxes), /60 doesn't divide into that.

Agreed, /56 is what's needed.

> thirdly, I don't want to assign routable ipv6 prefixes to everything, 
> just to end-user APs and when I last tried hnpd it wanted to give even 
> my p2p boxes /64s

Yes, it allocates /64 per interface. You can share interface with multiple 
things by creating bridge interfaces.

> fourthly, we have dnsmasq, odhcpd, odhcpc, babel and hnetd all battling 
> it out with slightly different notions of how to redistribute things.

Right, a device that speaks homenet should not request PD.

> I've come to rather appreciate NAT for what it does to separate my 
> policies from my ISP's.

Configuring static ULA addresses might be a way to handle it. Doesn't help 
reaching them from the outside though. We need DNS or other mechanism to 
keep track of addresses as they change over time.

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se