"Left with little choice, we proceeded to reinvent the wheel or, more
correctly, abandon the wheel entirely and go for a "hovercraft". We designed
CARP (Common Address Redundancy Protocol) to solve the same problem that these
other protocols are designed for, but without the same technological basis as
HSRP and VRRP. We read the patent document carefully and ensured that CARP was
fundamentally different. We also avoided many of the flaws in HSRP and VRRP
(such as an inherent lack of security). And since we are OpenBSD developers, we
designed it to use cryptography."
This message posted from opensolaris.org
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