On the last episode (Wed, 30 Mar 2005 19:27:11 +0200), Manuel Bouyer <bouyer@antioche.eu.org> said:

> On Tue, Mar 29, 2005 at 11:30:17PM +0200, Joel CARNAT wrote:
> > Hi,
> > 
> > I can't find any carp reference on my NetBSD boxes (manpage & google).
> > so :
> > 1. do we have any carp implementation ready (expect net/ucarp) ?
> > 2. what other choice do we have to get failover and/or load-balancing (for firewalling, HTTP, SMTP services and such) ?
> 
> ipf can do load-balencing with rdr or bimap rules (I don't remember). Maybe
> fail-over too. But I've never tried it.

 yeah, I've seen the rdr/round-robin feature in pf too (sorry, I use pf on NetBSD too ;)
 a question I had about that (posted on misc@openbsd.org and still not answered) is, what happens when some of the servers are down - does ipf/pf still rdr paquets to them.
I can see the same example in ipnat.conf (than in pf's doc) :
rdr le0 203.1.2.3/32 port 80 ->  203.1.2.3,203.1.2.4 port 80 tcp round-robin
What happens here when 203.1.2.3 goes down ?
Does 50% of the queries goes "host down" or is ipnat/pf smart enough to test if the host is UP before redirecting the network flow ?

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