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CARP compares well to UCARP on Linux, as I recently documented here:

* http://www.debian-administration.org/article/678/Virtual_IP_...

Thanks, I didn't know about UCARP

I didn't try keepalived on Linux (I tried it on FreeBSD) so I'm not right person to say is it better or not. Only I can say is that CARP performed really well from my perspective. I'm also interested in comparison of those two...

Keepalived implements vrrp, which seems to have patent issues according to Wikipedia https://en.wikipedia.org/wiki/Common_Address_Redundancy_Prot...