From the original message:

[1]

www        IN A   10.10.10.10
www        IN A   192.168.0.10



From pen homepage:

"This is pen, a load balancer for "simple" tcp based protocols such as http or smtp."

As I know DNS uses both tcp and udp protocols.

From the posters excerpt it looks like they are looking to load balance HTTP. [1]

For failover you can try OpenBSD Packet Filter with CARP protocol. PF can do load-balacing using different algorithms also. CARP is ported to FreeBSD. More info on: http://pf4freebsd.love2party.net/carp.html

Also true. Last time I looked at this however there was a big disclaimer saying that CARP's load balancing was likely to give a distorted distribution of load and I don't believe it does weighting. I believe this would also be a problem considering the
example in [1]:

From carp(4):

Note: ARP balancing only works on the local network segment. It cannot
     balance traffic that crosses a router, because the router itself will
     always be balanced to the same virtual host.

Cheers,
Dominic

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