Replying to
There's a fun story I learned about VRRP vs CARP which are two different protocols that do the same thing to share an IP between two computers. I learned because they use the same port number and I got curious.
Initially VRRP was the only way and it was patented even though they got the port reserved. Then the OpenBSD developers countered this by slapping on authentication to the protocol to say theirs is new and different so the patent doesn't apply.
So now FreeBSD carries on the BSD legacy and uses CARP for redundant routers.

