* Adam Thompson <athom...@athompso.net> [2014-06-30 19:15]:
> traffic with IPSec. Other uses are possible, but questionable because
> they may break lower-level assumptions. (or so I believe, anyway. I'm
> sure Henning will correct me if not.) 

I don't think carppeer uses than manually specifying the IP on the
carpdev of the other node are very well tested, so there might be
surprises, but I really don't why other uses shouldn't work as long as
the nodes see each other.

> FWIW, I don't use carppeer even
> though it could save me substantial IP address space, for a couple of
> reasons: 
> 1) I want the canary-in-the-coal-mine to inform me of any
> layer 2 weirdness 
> 2) I prefer predictability and "normal" use cases 
> 3)
> if I ever stop using CARP and switch to HSRP or VRRP, I'll need those
> addresses again 

you are creating massive confusion here regarding carppeer and
unnumbered carpdevs - those really have nothing to do with each other.

That said, I do use unnumbered carpdevs in some cases and places.

If carp0 has 10.0.0/24, and carp0 is backup on nodeX, nodeX might not
be able to reach 10.0.0/24. No more, no less. Can hurt, esp when the
default gateway is in that net, but is perfectly fine in many cases.

-- 
Henning Brauer, h...@bsws.de, henn...@openbsd.org
BS Web Services GmbH, http://bsws.de, Full-Service ISP
Secure Hosting, Mail and DNS. Virtual & Dedicated Servers, Root to Fully Managed
Henning Brauer Consulting, http://henningbrauer.com/

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