Firewall Redundancy
CARP

Similar in some ways to VRRP
Multicast Advertisement
Address moved by moving a virtual MAC address
Multiple virtual addresses on same network
Variable advertisement interval
most frequent advertiser becomes master
Advertisement protected by a SHA1 HMAC
Addresses not in Advertisement, but in HMAC
Supports layer 2 load balancing (ARP based)
IPv4 and IPv6 support


